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4. Did the Younger Dryas to Holocene climate transition favour high seismicity rates in the north‐western Alps?

Author

Mathilde Banjan, Crouzet Christian, Sabatier Pierre, Jomard Hervé, Bajard Manon, Demory Francois, Develle Anne‐Lise, Jenny Jean‐Philippe, Fanget Bernard, Malet Emmanuel, Nathaniel Findling, Alain Philippe, Didier Julien, Bichet Vincent, Clapot Sylvain, Messager Erwan, Université Gustave Eiffel, Laboratoire de Recherche commun IRSN-CNRS-Lille1 'Cinétique Chimique, Combustion, Réactivité' (C3R), Université de Lille, Sciences et Technologies-Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Bureau d'évaluation des risques sismiques pour la sûreté des installations (IRSN/PSE-ENV/SCAN/BERSSIN), Service de caractérisation des sites et des aléas naturels (IRSN/PSE-ENV/SCAN), Institut de Radioprotection et de Sûreté Nucléaire (IRSN)-Institut de Radioprotection et de Sûreté Nucléaire (IRSN), University of Oslo (UiO), Aix Marseille Université (AMU), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), iXBlue [Bonneuil - FR], Laboratoire Chrono-environnement (UMR 6249) (LCE), Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), IRSN, and LMC14

Subjects
Earthquake, turbidite, Younger Dryas, Holocene, Stratigraphy, lakes, General Earth and Planetary Sciences, Geology, north-western Alps, homogenite, [SDU.STU.AG]Sciences of the Universe [physics]/Earth Sciences/Applied geology, General Environmental Science
Abstract

International audience; In the French north-western Alps, several lakes of glacial origin, such as Aiguebelette and La Thuile, present some mass-transport deposits within their sedimentary sequences. These event layers can result from lake sediment destabilization eventually triggered by earthquakes. On Lake Aiguebelette, based on sedimentological, geochemical and magnetic analyses, and high-resolution seismic and bathymetric surveys a ca 1 m thick event layer was identified in the deepest lake basin and a synchronous ca 2 cm thick deposit in the shallow basin. Age-depth models based on radiocarbon ages reveal that both mass-transport deposits in Lake Aiguebelette occurred around the Younger Dryas - Early Holocene climatic transition (i.e. 11 700 cal bp) time range. In Lake La Thuile, located 30 km away, unique mass-transport deposits (translational slide type) were recorded at the same time range in sedimentary records. Additionally, high-resolution seismic profiles previously acquired in Lake Annecy and Lake Bourget support the hypothesis of significant mass-transport deposits occurring at the Younger Dryas - Early Holocene time range. These outcomes on four north-western peri-Alpine and Alpine lakes highlight the regional occurrence of mass-transport deposits in the Younger Dryas - Early Holocene time range. Seismic and rockfall events are discussed as potential sources of these significant and similarly aged mass-transport deposits. Based on this study and a literature review, the authors suggest that mechanisms induced by rapid climate change and glacial retreat, such as crustal rebound and erosional unloading, could favour the triggering of earthquakes and rockfall events. In the case of mass-transport deposits archived in north-western Alpine lakes during this time period, this study favours the hypothesis of increased seismicity as the primary source driving process involved.

Published
2022

6. Did the Younger Dryas to Holocene climate transition favour high seismicity rates in the north‐western Alps?

Author

Banjan, Mathilde, primary, Crouzet, Christian, additional, Sabatier, Pierre, additional, Jomard, Hervé, additional, Bajard, Manon, additional, Demory, Francois, additional, Develle, Anne‐Lise, additional, Jenny, Jean‐Philippe, additional, Fanget, Bernard, additional, Malet, Emmanuel, additional, Findling, Nathaniel, additional, Alain, Philippe, additional, Didier, Julien, additional, Bichet, Vincent, additional, Clapot, Sylvain, additional, and Messager, Erwan, additional

Published
2022
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10. Machine Learning and Deep Learning for retro-observation of Critical Zone processes with hyperspectral imaging

Author

Jacq, Kevin, Humbert, Kevin, Sanon, Dô Ambroise Judicaël, Auboiron, Jeanne, Gardes, Thomas, Fanget, Bernard, Benoit, A, Coquin, Didier, Sabatier, Pierre, Portet-Koltalo, F., Perrette, Yves, Arnaud, Fabien, Debret, Maxime, Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
[INFO.INFO-TS]Computer Science [cs]/Signal and Image Processing, [STAT.ML]Statistics [stat]/Machine Learning [stat.ML], [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.ST]Sciences of the Universe [physics]/Earth Sciences/Stratigraphy, [SDE]Environmental Sciences, ComputingMilieux_MISCELLANEOUS, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI], [SDU.STU.MI]Sciences of the Universe [physics]/Earth Sciences/Mineralogy
Abstract

International audience

Published
2021

12. Sedimentary structures discriminations with hyperspectral imaging on sediment cores

Author

Kévin Jacq, Rapuc William, Benoit Alexandre, Coquin Didier, Fanget Bernard, Yves Perrette, Pierre Sabatier, Wilhelm Bruno, Debret Maxime, and Fabien Arnaud

Subjects
bepress|Physical Sciences and Mathematics, bepress|Physical Sciences and Mathematics|Earth Sciences|Sedimentology, bepress|Physical Sciences and Mathematics|Physics, EarthArXiv|Physical Sciences and Mathematics|Environmental Sciences, EarthArXiv|Physical Sciences and Mathematics|Physics, bepress|Physical Sciences and Mathematics|Physics|Optics, bepress|Physical Sciences and Mathematics|Earth Sciences, bepress|Physical Sciences and Mathematics|Statistics and Probability|Statistical Models, EarthArXiv|Physical Sciences and Mathematics|Earth Sciences, EarthArXiv|Physical Sciences and Mathematics|Physics|Optics, EarthArXiv|Physical Sciences and Mathematics|Chemistry|Environmental Chemistry, bepress|Physical Sciences and Mathematics|Statistics and Probability|Multivariate Analysis, EarthArXiv|Physical Sciences and Mathematics|Chemistry, bepress|Physical Sciences and Mathematics|Environmental Sciences, EarthArXiv|Physical Sciences and Mathematics|Statistics and Probability|Statistical Models, EarthArXiv|Physical Sciences and Mathematics|Earth Sciences|Sedimentology, bepress|Physical Sciences and Mathematics|Chemistry, bepress|Physical Sciences and Mathematics|Chemistry|Environmental Chemistry, EarthArXiv|Physical Sciences and Mathematics|Environmental Sciences|Environmental Monitoring, bepress|Physical Sciences and Mathematics|Environmental Sciences|Environmental Monitoring, EarthArXiv|Physical Sciences and Mathematics, EarthArXiv|Physical Sciences and Mathematics|Statistics and Probability, EarthArXiv|Physical Sciences and Mathematics|Chemistry|Analytical Chemistry, bepress|Physical Sciences and Mathematics|Statistics and Probability, bepress|Physical Sciences and Mathematics|Chemistry|Analytical Chemistry, EarthArXiv|Physical Sciences and Mathematics|Statistics and Probability|Multivariate Analysis
Abstract

Hyperspectral imaging (HSI) is a non-destructive high-resolution sensor, which is currently under significant development to analyze geological areas with remote devices or natural samples in a laboratory. In both cases, the hyperspectral image provides several sedimentary structures that need to be separated to temporally and spatially describe the sample. Sediment sequences are composed of successive deposits (strata, homogenite, flood) that can be visible or not depending on sample properties. The classical methods to identify them are time-consuming, have a low spatial resolution (millimeter), and are generally based on a naked-eye counting. In this study, we propose to compare several supervised classification algorithms for the discrimination of sedimentological structures on lake sediments. Instantaneous events in lake sediments are generally linked to extreme geodynamical events (e.g., floods, earthquakes), their identification and counting are essential to understand long-term fluctuations and improve hazard assessments. This is done by reconstructing a chronicle of event layer occurrence, including estimation of deposit thicknesses. Here we applied two hyperspectral imaging sensors (Visible Near-Infrared VNIR, 60 μm, 400-1000 nm; Short Wave Infrared SWIR, 200 μm, 1000-2500 nm) on three sediment cores from different lake systems. We highlight that the SWIR sensor is the optimal one to create robust classification models with discriminant analyses. Indeed, the VNIR sensor is impacted by the surface reliefs and structures that are not in the learning set, which lead to miss-classification. These observations are also valid for the combined sensor (VNIR-SWIR). Several spatial and spectral pre-processing were also compared and allowed to highlight discriminant information specific to a sample and a sensor. These works show that the combined use of hyperspectral imaging and machine learning improves the characterization of sedimentary structures in laboratory conditions.

Published
2020

14. Correction of inner filter effect in mirror coating cells for trace level fluorescence measurements

Author

Fanget, Bernard, Devos, Olivier, and Draye, Micheline

Subjects
Fluorimetry -- Research, Fluorimetry -- Methods, Chemistry
Abstract

The sensitivity of the spectrofluorometric technique can be improved by a factor of about 3.6 using a mirror coating cell. In the case of a large working range, the nonlinear relationship due to the absorbance of solutions between concentration of the analyte of interest and fluorescence intensity (called inner filter effect) must be corrected. This paper suggests a universal inner filter correction equation based on the physical absorbance phenomenon of a mirror coating cell that only depends on the solution absorbance spectra and the cell parameters. These parameters are determined with rhodamine b standard solutions and a simplex method-based mathematical fitting.The methodology has been successfully applied to the correction of classical and synchronous spectra in absorbent media. The partial least squares (PLS) quantification of a mixture of trace levels (~1-10 [micro]g [L.sup.-1]) of six polycyclic aromatic hydrocarbons (PAHs) by synchronous fluorescence is possible, even in an absorbent matrix. This simple method allows extension of the analytical field of fluorescence quantification to a large working range in absorbent solutions.

Published
2003

15. Use of a Plackett--Burman design with multivariate calibration for the analysis of polycyclic aromatic hydrocarbons in micellar media by synchronous fluorescence

Author

Devos, Olivier, Fanget, Bernard, Saber, Abdel-llah, Paturel, Laurent, Naffrechoux, Emmanuel, and Jarosz, Jean

Subjects
Polycyclic aromatic hydrocarbons -- Analysis, Fluorimetry -- Methods, Chemistry
Abstract

This work describes the use of a multilevel Plackett-Burman design (PB) for the creation of a calibration set for partial least square regression (PLS). The PB calibration set was compared to a collinear analogue by testing these two PLS models for the analysis of six polycyclic aromatic hydrocarbons (PAHs). These compounds were analyzed in micellar media by synchronous fluorescence after determination of the experimental conditions (choice of surfactant, analytical conditions such as [DELTA] [lambda], step, and scan range). The external validation shows that the collinear set is inappropriate to quantify PAH in real samples, but the PB calibration set affords optimal results.

Published
2002

17. Etablishing the first continuous Holocene tephrostratigraphy on Kerguelen Archipelago, subantarctic Indian Oean

Author

Arnaud, Fabien, primary, Sabatier, Pierre, additional, Leloup, Anouk, additional, Servettaz, Aymerick, additional, Moine, Bertrand, additional, Develle, Anne-Lise, additional, Guédron, Stéphane, additional, Perrot, Vincent, additional, Poulenard, Jérôme, additional, Fanget, Bernard, additional, Malet, Emmanuel, additional, Støren, Eivind, additional, Reyss, Jean-Louis, additional, Le Viavan, Nicolas, additional, Heirman, Katrien, additional, De Batist, Marc, additional, Michel, Elisabeth, additional, de Beaulieu, Jacques-Louis, additional, Vanderputten, Nathalie, additional, and Bakke, Jostein, additional

Published
2020
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18. Study of Pansharpening Methods Applied to Hyperspectral Images of SedimentCores

Author

Jacq, Kevin, Coquin, Didier, Fanget, Bernard, Perrette, Yves, Debret, Maxime, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Processus et bilan des domaines sédimentaires (PBDS), Université de Lille, Sciences et Technologies-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), and Jacq, Kévin

Subjects
data fusion, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, [INFO.INFO-TI] Computer Science [cs]/Image Processing [eess.IV], hyperspectral imaging, [MATH.MATH-ST]Mathematics [math]/Statistics [math.ST], [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [INFO.INFO-IT]Computer Science [cs]/Information Theory [cs.IT], [INFO.INFO-TI]Computer Science [cs]/Image Processing [eess.IV], [INFO]Computer Science [cs], [INFO.INFO-IT] Computer Science [cs]/Information Theory [cs.IT], [INFO] Computer Science [cs], [MATH.MATH-ST] Mathematics [math]/Statistics [math.ST], hypersharpening
Abstract

International audience; Spectroscopic and imaging sensors are very useful methods in analytical chemistry because they are fast, cost effective, very informative analysis. Recent works search to fused them to create a new sensor with different spectral range to increase spectral and thus chemical information to create robust and precise prediction models. Remote sensing already used fusion methods to increase spatial resolution for spectral sensors. In this paper, we propose to use pixel level data fusion methods on laboratory sensors to check their availability to increase spatial information with low effect on both dimensions (spectral and spatial). The methodology presents two steps, first the registration to fit spatially the sensors and then the fusion step to estimate each sensor at the optimal resolution. The proposed method was used on three sediment cores, that are living sample which can move, crack. They are imaged sequentially with two sensors that do not overlap spectrally: visible near infrared VNIR (400-1000 nm, pixel size: 60 μm), short wave infrared SWIR (1000-2500 nm, pixel size: 190 μm). The registration step allows to have a correlation above 0.9 with still spatial defect bring by the samples that cannot be removed. The twenty-one state of the art pixel level data fusion methods seems to be less relevant than a bicubic interpolation for the case of the laboratory hyperspectral images of sediment cores.

Published
2019

19. Laboratory hyperspectral imaging a powerful tool for a fast-high-resolution analysis of natural sample: application to sediment core

Author

Jacq, Kevin, Perrette, Yves, Fanget, Bernard, Sabatier, Pierre, Coquin, Didier, Debret, Maxime, Arnaud, Fabien, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), and Jacq, Kévin

Subjects
Sediment core, Hyperspectral imaging, Image processing, [SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.IE] Environmental Sciences/Environmental Engineering, Chemometrics, Spectroscopy
Abstract

International audience; The aim of this presentation is to overview some applications of hyperspectral imaging for sediment core analysis in paleo-environmental studies. The increase of the sensibility and the resolution of sensors, as well as the development of performant data processing methods allow the analyze of natural sample in a very informative (chemical, physical and biological) and time effective way. Hyperspectral imaging is a method at the interface of spectroscopy and imaging where a spectrum is obtained for each pixel in the sample image. In laboratory conditions, many spectroscopic range can use this kind of method, from the X-ray to the infrared, also fluorescence and Raman. The dataset obtains is called a datacube due to his three dimensions (two spatials and one spectral), a fourth temporal dimension can be added. For that, both methods of image processing and spectral processing methods (chemometrics) can be used independently or together to improve sample knowledge. Quantitative modelling allows to establish a relationship between the spectra and destructive analysis (Particle Size Distribution, RockEval). These supervised models can then theoretically use on other samples without any sampling. Known structures can be discriminating accurately with classification methods, for example lamina or floods, with the labeling of some pixels to a known group. Unknown ones defined by chemical, physical or biological compounds can be determinates with similar methods and then explained by environment hypothesis. For these chemometrics methods, discriminant spectral wavelengths are identified and therefore sediment properties (chemical, physical or biological). Image processing of the core image or of the quantitative or qualitative map can be used to reveal surface structures (instant event, lamina) or local anomalies (coal, grain). The image resolution allows to see structures that the eye cannot see precisely, as infra-millimeter lamina. The use of spectro-spatial methods together and a time model allow to have a chronicle of structural sediment compositions and events.In this study, we use visible and near infrared hyperspectral imaging (pixel sizes: 60 and 240 micrometers) and X-Ray Fluorescence spectroscopy (240 micrometer) to analyze the lake Le Bourget sediment core (Savoie, France). Quantitative prediction models have been made for LOI550, Particle Size Distribution and fractions, some RockEval variables with correlation coefficients of the model upper than 0.8 and consistent uncertainties. Lamination counting was also realized with spectral classification methods and image processing, and this is in agreement with eye counting. With these two methods, seasonal variations can be separated in the eutrophic part of the core and compare. Hyperspectral imaging can also be used to find the optimal sampling areas for routine destructive analysis and to create predictive models. The use of several sensors, with data fusion methods, has shown that the increase of the amount of spectro-chemical information allowed to improve the robustness of predictive models. Hyperspectral imaging present already many possibilities to improve our knowledge on natural sample.

Published
2019

20. L’analyse multi-capteurs, un enjeu pour une connaissance plus précise des échantillons

Author

Jacq, Kevin, Perrette, Yves, Fanget, Bernard, Sabatier, Pierre, Coquin, Didier, Debret, Maxime, Arnaud, Fabien, Jacq, Kévin, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.ANAL] Chemical Sciences/Analytical chemistry, Hyperspectral imaging, [SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.MCG]Environmental Sciences/Global Changes, Data fusion, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, Sediment core, [SDE.MCG] Environmental Sciences/Global Changes, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [CHIM.CHEM] Chemical Sciences/Cheminformatics, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Chemometrics, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [CHIM.CHEM]Chemical Sciences/Cheminformatics, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], Spectroscopy, Image registration
Abstract

National audience; L’analyse à haute résolution pour la caractérisation des échantillons est un des enjeux actuels pour obtenir des informations fines spatiales et structurales (chimie, physique, biologie). Un banc d’analyse multi-modules est en cours de développement au sein du laboratoire EDYTEM. Il sera composé de deux appareils photos (image HD et modèle numérique de surface) ; de capteurs d’imageries hyperspectrales dans les gammes visible et proche-infrarouge, ainsi que de la fluorescence des états stationnaires et du Raman ; de capteurs spectroscopiques de fluorescence des rayons X et résolue en temps dans la gamme UV-visible. L’utilisation simultanée de tous ces capteurs, permettrait de créer un capteur composite avec une haute résolution spatiale, couvrant une large gamme spectrale et donc possédant beaucoup d’informations structurales. Différents défis technologiques restent à surmonter :(1)L’unité de base pour comparer les capteurs, qui est le pixel ou voxel, varie d’un capteur à l’autre. Il faut donc au préalable utiliser des méthodes de recalages de signaux (1D) ou d’images (2D) sur une information se recoupant entre les capteurs. Puis ensuite, utiliser les méthodes de fusion de données pour homogénéiser les résolutions spatiales.(2)Une stratégie est ensuite à déterminer pour l’analyse des données (Classification non supervisée ou supervisée, Régression quantitative ou Reconnaissance de formes). A ceci s’ajoute souvent la différence de résolution entre le voxel et la labélisation. Un exemple d’application sera discuté pour l’analyse quantitative de la matière organique.Une étude de cas sera effectuée sur l’analyse des carottes sédimentaires, mais celle-ci reste applicable pour l’analyse de carottes ou d’échantillons discrets de sol.

Published
2019

21. High-resolution prediction of organic matter concentration with hyperspectral imaging on a sediment core

Author

Jacq, Kévin, Perrette, Yves, Fanget, Bernard, Sabatier, Pierre, Coquin, Didier, Martinez-lamas, Ruth, Debret, Maxime, Arnaud, Fabien, Jacq, Kévin, Perrette, Yves, Fanget, Bernard, Sabatier, Pierre, Coquin, Didier, Martinez-lamas, Ruth, Debret, Maxime, and Arnaud, Fabien

Abstract

In the case of environmental samples, the use of a chemometrics-based prediction model is highly challenging because of the difficulty in experimentally creating a well-ranged reference sample set. In this study, we present a methodology using short wave infrared hyperspectral imaging to create a partial least squares regression model on a cored sediment sample. It was applied to a sediment core of the well-known Lake Bourget (Western Alps, France) to develop and validate a model for downcore high resolution LOI550 measurements used as a proxy of the organic matter. In lake and marine sediment, the organic matter content is widely used, for example, to reconstruct carbon flux variations through time. Organic matter analysis through routine analysis methods is time- and material-consuming, as well as not spatially resolved. A new instrument based on hyperspectral imaging allows high spatial and spectral resolutions to be acquired all along a sediment core. In this study, we obtain a model characterized by a 0.95 r prediction, with 0.77 wt% of model uncertainty based on 27 relevant wavelengths. The concentration map shows the variation inside each laminae and flood deposit. LOI550 reference values obtained with the loss on ignition are highly correlated to the inc/coh ratio used as a proxy of the organic matter in X-ray fluorescence with a correlation coefficient of 0.81. This ratio is also correlated with the averaged subsampled hyperspectral prediction with a r of 0.65.

Published
2019
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22. Fusion of multiresolution hyperspectral and fluorescence images for the analysis of sediment cores

Author

Jacq, Kevin, Coquin, Didier, Perrette, Yves, Fanget, Bernard, Sabatier, Pierre, Debret, Maxime, Martinez Lamas, Ruth, Arnaud, Fabien, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géodynamique et enregistrement Sédimentaire - Geosciences Marines (GM-LGS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), and Jacq, Kévin

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, [SDE.IE]Environmental Sciences/Environmental Engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

For solids environmental samples, spectroscopic properties can be analyzed but their interpretation is difficult due to the lack of common referential. For the spectroscopic images, pixels are relatively spatially referenced but in most cases, each sensor has his own spatial resolution.The sample used in this work is the first 30cm of a sedimentary core from the Lake Le Bourget (Western Alps), characterized by a stratified area corresponding to last eutrophic conditions of the lake.The aim of this work is to combine four images, (1) two hyperspectral images (9x15cm²): VNIR (98 bands, pixel: 60µm) and SWIR (144 bands, pixel: 189µm), and (2) two fluorescence images (2x10cm²; sub-sample of the previous one) using excitation wavelengths of 266nm and 355nm (1024 bands each, pixel: 100µm). Each hyperspectral data can be resume with a structured grayscale image. With these, it is possible to calculate a micro-deformation model (digital image correlation) and registered them with the same spatial dimension. Applying ARSIS method [1], a pixel level data fusion model is created to fuse all the spectra in a unique spatial cube with the optimal resolution using wavelet spatial transform (decomposition in 4 images: details, vertical, horizontal and diagonal). The new cube can be used as a new instrument.The ARSIS method allows to create a correlation model between the wavelet functions for all the resolution images used. This correlation can be used to add spatial structures to the low spatial resolute data calculated with wavelet transform.

Published
2018

23. Hyperspectral imaging for lake sediment cores analysis

Author

Kévin Jacq, Perrette, Yves, Fanget, Bernard, Coquin, Didier, Sabatier, Pierre, Rapuc, William, Blanchet, Claire, Martinez-Lamas, Ruth, Debret, Maxime, Arnaud, Fabien, Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire Géodynamique et enregistrement Sédimentaire - Geosciences Marines (GM-LGS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), and Jacq, Kévin

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, [SDE.IE]Environmental Sciences/Environmental Engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

Poster; The aim of this presentation is to overview some applications of hyperspectral imaging for core sediment analysis in paleoenvironmental studies. Sampling methods (millimetre or centimetre) and routine analyses are destructive and non-spatially resolved methods that consume time and material. Hyperspectral Imaging is a way to have the advantages of spectroscopy (non-destructive, fast analysis) and of imaging (high resolution, information is spatially referenced). coupling hyperspectral imaging with data mining methods makes possible to study several proxies at micrometric scale in each area of the core.Two hyperspectral cameras are used, a Visible-Near InfraRed VNIR (spectral range: 400-1000nm, spatial resolution: 60μm) and a Short Wave InfraRed SWIR (spectral range: 1000-2500nm, spatial resolution: 189μm). The two datasets produced can be fused in a unique one used to model environmental proxies. This methodology was achieved on a core from the lake Le Bourget (Western Alps, 53cm long and 9cm width). Quantitative prediction models can be made with partial least squares regression PLSR. This method links spectra with a reference analysis by the creation of a regression model. Assuming a scale homogeneity, it can be spread to all the spectra of the hyperspectral image to predict high spatially resolved proxies. Total Organic Carbon and Grain Size class models have been developed with a validation determination coefficient of 0.86 for TOC and 0.85 for clay. Concentration maps are used to study variation inside each stratigraphic unit event at the scale of laminae.These datasets can be used for classification. Based on pattern recognition and artificial neural network, it is possible to classify the type of lithology defined by the user, for example: summer or winter lamina, floods with labelled areas of less than 1% of the image. For varved sediments, this method can be used to count the varve and apply statistics on them.

Published
2018

24. Chronique d’une contamination par des éléments métalliques : cas de sédiments de barrage

Author

Parker, Alexandre, Courtin-Nomade, Alexandra, Bordas, François, Robin, Valentin, Malet, Emmanuel, Fanget, Bernard, Pignol, Cécile, Develle, Anne-Lise, Sabatier, Pierre, Referent HAL Edytem, Christine Maury, Groupement de Recherche Eau, Sol, Environnement (GRESE), Université de Limoges (UNILIM), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), and Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.MCG]Environmental Sciences/Global Changes, [SHS.GEO] Humanities and Social Sciences/Geography, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.ES] Environmental Sciences/Environmental and Society, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

Poster; International audience; Dams represent favorable contexts for sediments accumulation in large volumes. In the caseof inorganic contamination, Metallic Elements (ME) may represent a great environmentalissue, as they constitute potential ME sinks and sources. Sedimentary archive records thetemporal evolution of the contamination, sediments transfers and the sediments-MEassociation that result from different mechanisms (punctual or exceptional events, naturallyoccuring or resulting from exploitation operations).

Published
2018

25. Micrometric mapping of total organic carbon in lake sediment cores combining fusion of multiresolution hyperspectral images and PLSR analysis

Author

Jacq, Kevin, Perrette, Yves, Fanget, Bernard, Coquin, Didier, Sabatier, Pierre, Debret, Maxime, Martinez Lamas, Ruth, Arnaud, Fabien, Jacq, Kévin, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géodynamique et enregistrement Sédimentaire - Geosciences Marines (GM-LGS), and Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, [SDE.IE]Environmental Sciences/Environmental Engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

Poster; Sedimentary cores are used, thanks to their physical, chemical and biological properties, to infer past climate and environment. Sampling methods (millimetre or centimetre) and routine analysis are destructive and non-spatially resolved methods that consume time and material. The use of hyperspectral imaging makes it possible to have micrometric area in each point of the core. We use two hyperspectral cameras, the VNIR (spectral range: 400-1000nm, spatial resolution: 60μm) and the SWIR (spectral range: 1000-2500nm, spatial resolution: 189μm). Usually each camera is used separately. The goal of this work is to show the combination of sensor increase performance predictions. A pixel-level data fusion based on the ARSIS method [1] is applied to create a unique cube at the optimal resolution. This new cube can be used with a usual PLSR method to develop a model for the total organic carbon.Three cores from the lakes Le Bourget, Annecy and Geneva (Western Alps) are been tested (approximately 60cm long and 9cm width each). For both samples, the results show an increase prediction performance rather than data used separately. In the unique cube, the selected wavelength (chlorophyll area (nm), C-H bonds ( nm) and O-H bonds ( nm)) corresponds to those selected by each sensor. Although the analyzes were performed on bulk samples (5 mm x 90 mm x 45 mm slices), the prediction model provides access to the mapping of the surface with a micrometric resolution (the 60μm pixel can be interpreted as relevant information).

Published
2018

29. Hyperspectral Imaging for high resolution, non-destructive and fast analysis of sediment cores : application to Lake Le Bourget and Black Sea sediment cores

Author

Jacq, Kevin, Martinez Lamas, Ruth, Perrette, Yves, Fanget, Bernard, Debret, Maxime, Coquin, Didier, Sabatier, Pierre, Arnaud, Fabien, Toucanne, Samuel, Deloffre, Julien, Riboulot, Vincent, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Informatique, Systèmes, Traitement de l'Information et de la Connaissance (LISTIC), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Morphodynamique Continentale et Côtière (M2C), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Géodynamique et enregistrement Sédimentaire - Geosciences Marines (GM-LGS), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), and EDYTEM, Océane Giorda

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [CHIM.ANAL] Chemical Sciences/Analytical chemistry, [SDE.IE]Environmental Sciences/Environmental Engineering, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.ES] Environmental Sciences/Environmental and Society, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [PHYS.PHYS.PHYS-DATA-AN] Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an], [SDE.ES]Environmental Sciences/Environmental and Society, [PHYS.PHYS.PHYS-DATA-AN]Physics [physics]/Physics [physics]/Data Analysis, Statistics and Probability [physics.data-an]
Abstract

Sedimentary archives are used to infer past climate and environment thanks to their physical and chemical properties. Sampling methods (millimetric or centimetric) and routine analysis are time and material consuming. The use of some specific spectroscopic methods and data analysis, allow to develop and perform some robust methods capable of (i) fast high resolution (ii) performed at low costs (iii) non-destructive and (iv) monitor concentration variations of major sediment compounds. X-ray fluorescence spectroscopy is one of these techniques, but it is able to detect just mineral geochemistrys. Whereas hyperspectral imaging (VNIR 400-1000 nm, SWIR 1000-2500 nm) allow, behind each voxel (a pixel with several wavelengths), to define spectral fingerprint of organic or mineral chemical compounds. This type of data can be analyzed by statistical techniques. Many (pseudo-) univariate coefficients are available for the quantification of some molecules (RABD845 for BPhe a, RABD660-670 for chlr-a and chlorins). But in this study we choose to applied multivariate methods that take into account all spectra variations. To achieve such study we can use technic that usually applied in classical spectroscopy or for satellite data that can be unsupervised or supervised. For unsupervised techniques, without any prior knowledge of the sample, exploratory algorithms are used to determine groups in the data. Then, these groups can be interpreted with the comparison to other analytical methods. It is possible to find pure signal that corresponds to one or several organic or mineral sedimentary compounds by (i) endmembers techniques, (ii) spectral unmixing, or (iii) clustering. For supervised techniques, we can use the knowledge of sample chemical and physical properties to create prediction models, then it is possible to observe variations of a specific property along the core. To develop qualitative and quantitative model for focused spectral properties we can applied classification and regression techniques. They allow to discriminate spectral domains or some wavelengths for some interest property. In the present study, Lake Le Bourget (Savoie, France) and Black Sea (Northwest margin) sediment cores are used. From this two different environmental systems we could create and test several prediction models. The high-resolution acquisition is done with two hyperspectral cameras: VNIR (400-1000 nm) and SWIR (1000-2500 nm) with spatial resolution of several dozen micrometers. Both sensors are well designed to create predictive models for either physical or chemical properties. In order to improve prediction models and make them more robust, we can pair these two cameras and add XRF core scanner data. For the black sea sediment, we use unsupervised techniques to determine groups and define interesting spatial areas to take samples for analytic analysis. Whereas for the Lake le Bourget sediment, several previous studies allow us to have many available data, thus supervised techniques are used to observe along core variations. For some properties, we could try to use models of the Lake Le Bourget in the Black Sea data, for example if we create a grain-size model, chemical elements ratio or organic compounds.

Published
2017

30. Suivi en continu des températures et conductivités des eaux thermales en contexte hyper minéralisé. Monitroring en milieux naturels, retours d’expériences en terrains difficiles

Author

Malet, Emmanuel, Dzikowski, Marc, Fanget, Bernard, Doublet, Camille, Gasquet, Dominique, Referent HAL Edytem, Christine Maury, Emmanuel Malet, Laurent Astrade, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences
Published
2017

31. Contamination records of sediments by heavy metals in a mining-impacted dam

Author

Parker, Alexandre, Courtin-Nomade, Alexandra, Bordas, François, Robin, Valentin, Malet, Emmanuel, Fanget, Bernard, Pignol, Cécile, Develle, Anne-Lise, Sabatier, Pierre, Groupement de Recherche Eau, Sol, Environnement (GRESE), Université de Limoges (UNILIM), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and Referent HAL Edytem, Christine Maury

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [SDE.IE]Environmental Sciences/Environmental Engineering, [SHS.GEO] Humanities and Social Sciences/Geography, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.ES] Environmental Sciences/Environmental and Society, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

Poster; International audience; Dams represent favorable contexts for sediments accumulation in large volumes (typical several cm.y-1 up to 200 cm.y-1 for some Asian streams). These sedimentary reservoirs may represent a great environmental issue as they may constitute sinks for Metallic Elements (ME). Dam contexts allow studying the temporal evolution of contaminated sediments transfers (and ME) by different mechanisms (e.g., flood events), notably by resuspension and homogenization processes.• This study has been focussed on a watershed mainly affected by past mining activities (± 6 t of Ag and ± 6000 t of Pb were extracted until the 19th century), where sediments have been accumulated

Published
2017

32. DNA from lake sediments reveals long-term ecosystem changes after a biological invasion

Author

Ficetola, Gentile Francesco, primary, Poulenard, Jérôme, additional, Sabatier, Pierre, additional, Messager, Erwan, additional, Gielly, Ludovic, additional, Leloup, Anouk, additional, Etienne, David, additional, Bakke, Jostein, additional, Malet, Emmanuel, additional, Fanget, Bernard, additional, Støren, Eivind, additional, Reyss, Jean-Louis, additional, Taberlet, Pierre, additional, and Arnaud, Fabien, additional

Published
2018
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33. Extensive lake sediment coring survey on Sub-Antarctic Indian Ocean Kerguelen Archipelago (French Austral and Antarctic Lands)

Author

Arnaud, Fabien, Fanget, Bernard, Malet, Emmanuel, Poulenard, Jérôme, Støren, Eivind, Leloup, Anouk, Bakke, Jostein, Sabatier, Pierre, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), University of Bergen (UiB), European Geosciences Union, and Referent HAL Edytem, Christine Maury

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences
Abstract

Poster; International audience; Recent paleo-studies revealed climatic southern high latitude climate evolution patterns that are crucial to understand the global climate evolution(1,2). Among others the strength and north-south shifts of westerlies wind appeared to be a key parameter(3). However, virtually no lands are located south of the 45th South parallel between Southern Georgia (60°W) and New Zealand (170°E) precluding the establishment of paleoclimate records of past westerlies dynamics. Located around 50°S and 70°E, lost in the middle of the sub-Antarctic Indian Ocean, Kerguelen archipelago is a major, geomorphologically complex, land-mass that is covered by hundreds lakes of various sizes. It hence offers a unique opportunity to reconstruct past climate and environment dynamics in a region where virtually nothing is known about it, except the remarkable recent reconstructions based on a Lateglacial peatbog sequence(4). During the 2014-2015 austral summer, a French-Norwegian team led the very first extensive lake sediment coring survey on Kerguelen Archipelago under the umbrella of the PALAS program supported by the French Polar Institute (IPEV). Two main areas were investigated: i) the southwest of the mainland, so-called Golfe du Morbihan, where glaciers are currently absent and ii) the northernmost Kerguelen mainland peninsula so-called Loranchet, where cirque glaciers are still present. This double-target strategy aims at reconstructing various independent indirect records of precipitation (glacier advance, flood dynamics) and wind speed (marine spray chemical species, wind-borne terrigenous input) to tackle the Holocene climate variability. Despite particularly harsh climate conditions and difficult logistics matters, we were able to core 6 lake sediment sites: 5 in Golfe du Morbihan and one in Loranchet peninsula. Among them two sequences taken in the 4km-long Lake Armor using a UWITEC re-entry piston coring system by 20 and 100m water-depth (6 and 7m-long, respectively). One sequence from the newly-named Lake Tiercelin (2m-long) was recovered using UWITEC gravity coring equipment operated from a portable rubber boat by 54m water-depth. Those three sequences cover the whole Holocene periods. The 3m-long sequence taken in Lake Guynemer, Loranchet peninsula, was taken using a homemade small platform and a Nesje piston corer by 50m water-depth and covers the last 5 ka cal. BP. Two additional lakes were cored in the vicinity of Lake Armor: Fougères and Poule from which short sequences were taken in order to study environmental changes since the arrival of humans in the 18th century and the subsequent introduction of exogenous plant and animal species. We present here preliminary results including the dating of all sediment sequences as well as their chemical logging and sedimentological description. This already revealed the recurrence of Holocene volcanic eruptions as well as erosion patterns that are comparable among different records. The recognition of tephra layers will further allow the synchronization of terrestrial records together and with marine records around Kerguelen Archipelago. Paleoclimate interpretations of acquired data as well as further measurements are still ongoing processes. However, one may already argue that we collected rare geological sequences of prime importance in the quest of understanding climate patterns affecting the southern high latitudes all along the Holocene. 1. Lamy. et al. 2015. in Integr. Anal. of Intergl. Clim. Dyn. Schulz & Paul eds., 75–81 (Springer) 2. Rebolledo et al. 2015. Quat. Res. 84, 21–36 3. Agosta et al. 2015. Clim. Res. 62, 219–240 4. Van der Putten et al 2015. Quat. Sci. Rev. 122, 142–157

Published
2016

34. Holocene glacier activity on Kerguelen Island: preliminary results from a novel proglacial lake sediment record

Author

Støren, Eivind, Bakke, Jostein, Arnaud, Fabien, Poulenard, Jérôme, Fanget, Bernard, Malet, Emmanuel, Sabatier, Pierre, University of Bergen (UiB), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), and European Geosciences Union

Subjects
[SDE]Environmental Sciences
Abstract

Poster; International audience; The Polar-regions are changing rapidly as greenhouse warming is continuing with huge impact on e.g. sea ice extent and snow cover. This change triggers teleconnections to low latitude areas challenging societies and human activity. We have, however, very little quantitative information of past climate in the Polar-regions that can be used to evaluate the potential responses and the response patterns to forcing changes and changes in boundary conditions. Whatever anthropogenic changes may occur in the future, they will be superimposed on, and interact with, natural climate variations due to all the forcing we are aware of. This means we need to better document past climate/environmental variability of the Polar-regions. Especially in the Southern Ocean there are few time series recording past climate due to few suitable land areas and the few Sub-Antarctic Islands is remote and has cumbersome logistics. Continuous terrestrial records from this region are therefore urgently needed for constraining future scenarios from earth system models. Glaciers and ice caps are still ubiquitous in the Polar-regions, although they are rapidly shrinking due to the on-going warming. The continuous sedimentary records produced by glaciers, which are stored in downstream lakes, represent supreme archives of past variability wherefrom quantitative information of key climate system components can be extracted. Kerguelen Island is located within the Antarctic Circumpolar Current and the Southern Westerly wind belt and contains several glaciers and smaller ice caps. Terrestrial archives recording past history of the glaciers at Kerguelen thus have a unique potential to record past changes in oceanic and atmospheric circulation patterns from southern mid-latitudes. Here we present preliminary results from the first distal glacier-fed lake that is sampled from Kerguelen Island. A 2.8 m long sediment core was obtained from Lac Guynemer (121masl.) located at the Peninsule Loranchet at the northern part of Kerguelen Island. The lake receives glacial meltwater from Glacier Guynemer, a small cirque glacier at the Pic Guynemer (1188masl.). The sediment core was analyzed with high-resolution core scanning X-ray fluorescence (XRF), magnetic parameters, loss-on-ignition and dry bulk density, to reconstruct past glacier variability of Glacier Guynemer. The sediment record covers the last 5000 years and show a dynamic glacier responding to the changing boundary conditions during the Neoglacial.

Published
2016

36. Un enregistreur quaternaire souterrain de l’environnement exokarstique et endokarstique : le cône d’entrée de l’aven d'Orgnac (Ardèche, France)

Author

Jaillet, Stéphane, Boche, Elisa, Cailhol, Didier, Couchoud, Isabelle, Develle, Anne-Lise, Fanget, Bernard, Gambéri, L, Lignier, Vincent, Malet, Emmanuel, Peltier-Muscatelli, R, Prud'Homme, Françoise, Tocino, Stéphane, Sadier, Benjamin, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Musée régional de Préhistoire, site d'Orgnac, Ministère de la Culture et de la Communication (MCC), and Referent HAL Edytem, Christine Maury

Subjects
[SDE] Environmental Sciences, lac, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, Slovénie, [SHS.GEO] Humanities and Social Sciences/Geography, [SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics, [SHS.GEO]Humanities and Social Sciences/Geography, activité tectonique, Sédiments, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry, [SDE]Environmental Sciences, ComputingMethodologies_GENERAL, ComputingMilieux_MISCELLANEOUS, Holocène
Abstract

Poster; International audience

Published
2015

37. Holocene evolution of a montane lake catchment inferred from multiproxy sediment analysis: climatic and anthropic impacts in french prealps

Author

Bajard, Manon, Sabatier, Pierre, Poulenard, Jérôme, David, Fernand, Arnaud, Fabien, Develle, Anne-Lise, Reyss, J.L., Fanget, Bernard, Malet, Emmanuel, Crouzet, Christian, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut des Sciences de la Terre (ISTerre), Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.MCG]Environmental Sciences/Global Changes, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

International audience; ake La Thuile in the Massif des Bauges (874 m a.s.l. French Alps) provides a 18 meters sedimentary sequence.Due to its mid-altitude position, this lake is one of the first to be formed through the glacial retreat and documentsthe evolution of its catchment since the Late Glacial Maximum. The first 6 meters of the core cover the last 12000 years, and allowed to study human/climate/environment interactions in a carbonated environment. This studyis the first one to investigate a mid-altitude lake in the French Alps for paleoenvironment reconstruction fromlake sediment archive. Its altitudinal position presents the advantage to be very accessible to human activitiesand allows more developed agriculture than in higher altitude. This study aims to determined how and when isexpressed the erosive response of such an environment to human settlement.High resolution multiproxy analysis of the first 6 meters including sedimentological, palynological andgeochemical data associated to a well-constrained chronology over the Holocene period allows us to understandthe respective impacts of both climate and human on the evolution of Lake La Thuile environment.Five major phases of evolution have been highlighted over this period. From 12 000 to 10 000 yr cal. BP,the vegetation is developing with the onset of hardwood species and the disappearance of Pinus. From 10 000to 4500 yr cal. BP the warmer climatic conditions of the middle of the Holocene allows the forest to densifyand the very low sedimentation rate indicates that the forest stabilizes slopes and prevents from the erosionon the watershed. The climate cooling of the Neoglacial period triggers a first erosive phase with a decreasingof the forest around 3300 cal. BP. Human settlements are suggested at La Thuile from 2500 yr cal. BP bypalynological evidence of anthropic taxa. The triggered clearing is accompanied by a second erosive phase relatedto anthropic activities during the Roman period. Erosion intensified from 1600 cal. BP in a third erosive phase cor-responding to agriculture intensification during the Middle Ages. At the end of the Middle Ages, human footprintseems to decrease but the reason of this change is not resolved between social determination or/and climate forcing.These three erosive phases may have completely changed the catchment behavior until the agriculturalabandonment in the middle of the 20th century. Lake La Thuile sedimentary infill shows a landscape evolutionfirst controlled by climate and progressively, since 2500 years ago, human activities came to superimpose. Therole of human seems to be more important with abrupt and maybe irreversible modifications of the landscape

Published
2015

38. La géochimie organique des sols et des sédiments : une clé pour décrire l’anthropocène ?

Author

Poulenard, Jérôme, Arnaud, Fabien, Perrette, Yves, Sabatier, Pierre, Deline, Philip, Giguet-Covex, Charline, Bajard, Manon, Mourier, Brice, Quiers, Marine, Malet, Emmanuel, Develle, Anne-Lise, Fanget, Bernard, Dambrine, Etienne, Faivre, Pierre, Chalmin, Emilie, Referent HAL Edytem, Christine Maury, Emilie Chalmin, Etienne Dambrine, Bernard David, Pierre Faivre, Jérôme Poulenard, Laurent Astrade, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Ecologie des Hydrosystèmes Naturels et Anthropisés (LEHNA), Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Emilie Chalmin, Etienne Dambrine, Bernard David, Pierre Faivre, Jérôme Poulenard, Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Centre National de la Recherche Scientifique (CNRS), and Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
Soil science, [SDE.IE]Environmental Sciences/Environmental Engineering, évolution des écosystemes, [SDE.MCG]Environmental Sciences/Global Changes, [SHS.GEO] Humanities and Social Sciences/Geography, Pedosphere, pédologie, Paleoenvironement, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.ES]Environmental Sciences/Environmental and Society, [SHS]Humanities and Social Sciences, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, paléoenvironnement, [SDE.MCG] Environmental Sciences/Global Changes, Adaptative change, traceurs pédologiques, Ecosysteme evolution, Soil fingerprint, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.ES] Environmental Sciences/Environmental and Society, [SHS] Humanities and Social Sciences, [SDE.BE]Environmental Sciences/Biodiversity and Ecology
Abstract

This article aims to introduce the research presented in this volume of the Collection EDYTEM. The different papers comefrom a common scientific meeting between soil scientists of the French Soil Science Society (AFES) and organic geochemists ofFROG. These articles seem to indicate a renewal of the approaches, issues and methods of study on the evolution of soil linkedwith human activities. Soil geochemistry and sediments (particularly organic geochemistry) appears as an indispensable tool toreveal the history of soil and human practices in the Anthropocene., Le présent article se propose de mettre en perspective les travaux de recherche présentés dans ce volume de la CollectionEDYTEM. Fruit d’une rencontre scientifique entre pédologues de l’AFES et géochimistes de FROG, ces articles nous semblenttémoigner d’un renouveau des approches, des questions et des méthodes d’étude sur l’évolution des sols en lien avec les activitéshumaines. La géochimie des sols et des sédiments (en particulier la géochimie organique) nous apparaît comme un outilindispensable pour révéler l’histoire des sols et des pratiques humaines à l’Anthropocène.

Published
2015

39. Determining soil sources by organic matter EPR fingerprints in twomodern speleothems

Author

Perrette, Yves, Poulenard, Jérôme, Protiere, Myriam, Fanget, Bernard, Lombard, Christian, Miege, Cecile, Quiers, Marine, Naffrechoux, E., Pepin-Donat, Brigitte, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Structures et propriétés d'architectures moléculaire (SPRAM - UMR 5819), Institut Nanosciences et Cryogénie (INAC), Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Laboratoire de Chimie Moléculaire et Environnement (LCME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Université Grenoble Alpes (UGA), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), and Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Soil, [SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.MCG]Environmental Sciences/Global Changes, Karst, Organic matter, EPR, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, Speleothem, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

International audience; Organic matter (OM) sources and transfers are critical questions at the crossroad of ecology, hydrologyand paleoenvironmental studies in karst environments. Recently chemical or isotopic characterisationsof these organic matters have demonstrated their diversity in karst water and speleothems. However,knowledge of their origin and transfer from soil needs to be improved especially in karst environmentswhere a mosaic of soils occurs. Here we investigate the applicability of the Electron ParamagneticResonance (EPR) signature of OM to seek different soil fingerprints in speleothems. The positions andthe shapes of semiquinone-type radical’s EPR lines are considered as a robust signature of the organicmatter through the different compartment of karst ecosystems. We demonstrate that the combinationof EPR lines simulation constitutes a fingerprint that discriminates folic Leptosol developed on limestoneoutcrops from eutric Cambisols located in the dolines and topographical depressions. We also report theconservation of the thinner OM EPR lines after a water extraction of the organic matter from soils. Finally,OM EPR signatures were detected in two different speleothems sampled near each other: a stalagmiteand a subaqueous flowstone. An unexpected two-orders-of-magnitude discrepancy between the free radicalconcentrations of the subaqueous flowstone and the soils on one hand, and the low free radical concentrationof the stalagmite samples on the other, was ascribed to the kinetics of conformational changesin OM occurring during their transfer through karst either in fast or in slow water pathways. A folicLeptosol fingerprint was found in stalagmite and conversely, an eutric Cambisol fingerprint was foundin the flowstone sample. This unexpected difference between the EPR signatures of the flowstone sampleand stalagmite sample was ascribed to the masking of the Leptosol EPR signature (due to the low concentrationsof free radicals) in the case of the flowstone sample and to the fact that the EPR signature of thestalagmite sample clearly shows the Leptosol is the sole source of the OM. Finally, the folic Leptosolfingerprint remains steady over the last four centuries covered by the stalagmite demonstrating thatthe source of the OM is stable over the growth period strengthening the interest of OM entrapped inspeleothem for paleoenvironment studies.

Published
2015

40. Reconstitution de l’évolution du paysage du lac de La Thuile (874 m, Massif des Bauges) durant l’Holocène : mise en évidence d’une domination des processus érosifs liés à l’homme à l’étage montagnard

Author

Bajard, Manon, Sabatier, Pierre, David, Fernand, Develle, Anne-Lise, Reyss, J.L., Fanget, Bernard, Malet, Emmanuel, Arnaud, Daniel, Augustin, Laurent, Crouzet, Christian, Poulenard, Jérôme, Arnaud, Fabien, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Emilie Chalmin, Etienne Dambrine, Bernard David, Pierre Faivre, Jérôme Poulenard, Laurent Astrade, Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Referent HAL Edytem, Christine Maury, Emilie Chalmin, Etienne Dambrine, Bernard David, Pierre Faivre, Jérôme Poulenard, and Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
climat, [SDE.IE]Environmental Sciences/Environmental Engineering, [SHS.GEO] Humanities and Social Sciences/Geography, [SDE.MCG]Environmental Sciences/Global Changes, activités humaines, lake sediments, sédiments lacustres, apports terrigènes, [SHS.GEO]Humanities and Social Sciences/Geography, sols, [SDE.ES]Environmental Sciences/Environmental and Society, [SHS]Humanities and Social Sciences, [SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, human activities, vegetation, terrigenous inputs, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.ES] Environmental Sciences/Environmental and Society, [SHS] Humanities and Social Sciences, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, soils, climate, ComputingMilieux_MISCELLANEOUS
Abstract

Lake La Thuile, in the Northern French Prealps (874 m a.s.l.), provides an 18 m long sedimentary sequence spanning the entireLateglacial/Holocene period. The high resolution multi-proxy (sedimentological, palynological, geochemical) analysis of theuppermost 6.2 meters reveals the Holocene dynamics of erosion in the catchment in response to landscape modifications. Themountain belt led us to take an interest in this altitude, which is favorable to human activities and is sufficiently disconnectedfrom large valleys to capture a specific sedimentary signal. From 12 to 4.5 ka cal. BP, the onset of hardwood species triggereda drop in erosion following the Late glacial/Holocene transition. The forest became denser and favored slope stabilizationwhile erosion processes were very weak. Soils were acidifying. A first erosive phase was initiated at ca. 4.5 ka cal. BP withoutevidence of human presence in the catchment. Then, the forest declined at approximately 3000 cal. BP, suggesting the firsthuman influence on the landscape. Two erosive phases are related to anthropic activities: approximately 2500 cal. BP during theRoman period, and at 1600 cal. BP in the Middle Ages. In contrast, the lower erosion produced during the Little Ice Age suggeststhat anthropic activities dominated the erosive processes and completely masked the natural effects of climate on erosion., Le lac de La Thuile dans les préalpes du nord (874 m) fournit une séquence sédimentaire de 18 m de long. L’analyse multi-proxieshaute résolution des 6,2 premiers mètres de sédiment incluant des données sédimentaires, palynologiques et géochimiques, associéesà une chronologie bien établie, documente l’évolution holocène de l’érosion dans le bassin versant et les modifications dupaysage. Le bassin versant est suffisamment déconnecté des grandes plaines pour capturer un signal sédimentaire spécifique àce milieu. De 12 à 4,5 ka cal. BP, la végétation se développe avec l’apparition de feuillus alors que l’érosion diminue à la suitede la transition Tardiglaciaire-Holocène. La forêt devient plus dense, stabilise les pentes et empêche l’érosion des sols qui sedéveloppent en s’acidifiant. Une première phase érosive est initiée vers 4,5 ka cal. BP. Le paysage change avec le développementde la hêtraie-sapinière. Les taxons anthropiques font leur apparition autour de 3 000 cal. BP. Deux autres phases érosives sontà mettre en relation avec l’ouverture du milieu par les activités humaines: à partir de 2,5 ka cal. BP, à la fin de l’âge du Bronzeet pendant la période Romaine, et après 1,6 ka cal. BP avec le Moyen-âge. Elles engendrent un rajeunissement et une recarbonatationdes sols. L’érosion plus faible produite durant le Petit âge Glaciaire suggère que les activités anthropiques dominentles processus liés à l’érosion et masquent complètement l’impact du climat sur l’érosion à cette altitude

Published
2015

41. A 4D sedimentological approach to reconstruct the flood frequency and intensity of Rhône River (Lake Bourget, NW European Alps)

Author

Wilhelm, Bruno, Jenny, Jean-Philippe, Arnaud, Fabien, Sabatier, Pierre, Giguet-Covex, Charline, Melo, Alain, Fanget, Bernard, Malet, Emmanuel, Perga, Marie-Elodie, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), and Maury, Christine

Subjects
[SDE] Environmental Sciences, [SDE]Environmental Sciences
Abstract

Poster; A high-resolution sedimentological study of the large Lake Bourget (French Alps, 231m a.s.l., 45 45'55N,5 51'45E) was conducted to reconstruct the flood frequency and intensity (or magnitude) in the area over the last 350 years. Particular emphasis was placed on investigating the spatio-temporal distribution of flood deposits in this large lake basin. The thicknesses of deposits resulting from 30 flood events of the Rhône River were collected over a set of 24 short sediment cores. Deposit thicknesses were compared with instrumental data for the Rhône River discharge for the period from 1853 to 2010. The results show that flood frequency and intensity cannot be reliably reconstructed from a single core because of the inhomogeneous flood-deposit geometry in such a large lake. From all documented flood-deposit thicknesses, volumes of sediment brought into the lake during each flood event were computed through a kriging procedure and compared with the historical instrumental data. The results show that reconstructed sediment volumes are well correlated to maximal flood discharges. This significant correlation suggests that the increase of embankment and dam settlements on the Rhône River during the last 150 years has not significantly affected the transport of the smallest sediment fraction during major flood events. Hence, assessment of the flood-sediment volumes deposited in the large Lake Bourget allowed to reliably reconstruct the flood frequency and intensity of the past Rhône River floods.

Published
2014

42. Comparison of extreme flood events stratigraphy from two nearby sediment records, Western French Alps

Author

Fouinat, Laurent, Arnaud, Fabien, Sabatier, Pierre, Poulenard, Jérôme, Reyss, Jean-Louis, Chaumillon, Eric, Develle, Anne-Lise, Fanget, Bernard, Malet, Emmanuel, Schoeneich, Philippe, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Pacte, Laboratoire de sciences sociales (PACTE), Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Sciences Po Grenoble - Institut d'études politiques de Grenoble (IEPG)-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), LIttoral ENvironnement et Sociétés (LIENSs), and La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDE]Environmental Sciences
Abstract

Poster; Recent works showed Alpine lake sediment records can be used to reconstruct past extreme flood events chronologies. Reaching such a goal is crucial as the evolution of torrential flood patterns in the context of global warming is still poorly understood. In this study, we compare flood chronicles (frequency and intensity) acquired from two adjacent watershed-lake systems in the western French Alps. We hence aim at investigating the influence of local geomorphic and sedimentological settings on reconstructed chronicles. We studied sediment cores sampled from lake Lauvitel (1500 m a.s.l.) and lake Muzelle (2200 m a.s.l.) spanning the last 3500 and ca. 2000 last years, respectively. Their catchment areas are just separated by a ridge (3000 m a.s.l). Despite the vicinity of the lakes, their systems differ a lot from one to the other. Lauvitel catchment (15.1 km2) is more than three times larger than Muzelle one (5 km2); as well as lake surfaces. The surrounding vegetation is also greatly contrasting. However, the precipitation pattern is considered to be the same in both systems. Here, we focus on the most recent deposits covering the last 100 years, when sediment dating tie points and historical data are numerous, allowing to compare written archives and geological records. Flood deposits documented in sediment cores from both lakes have been dated through radionuclide-based geochronology (210Pb, 137Cs, 241Am). They were then investigated using high resolution sedimentological and geochemical analyses. The comparison of flood deposits with historical data of extreme precipitations in the nearby Vénéon river valley, allow us to determine the cause and effect of such events. We found that most sediment deposits are simultaneous with torrential floods or debris flows that impacted villages down in the valley. In total, five extreme events were recorded in both lakes and synchronous to historical records down the valley. However, some flood deposits are proper in each lakes. They certainly reflect the contrast between torrential activity and sediment sources of each catchment. The distinction of extreme and common deposits in the lake is imperative in order to extend the methodology to the whole sediment sequence.

Published
2014

43. Long-term impact of pesticides use on vineyard

Author

Sabatier, Pierre, Poulenard, Jérôme, Fanget, Bernard, Reyss, Jean-Louis, Develle, Anne-Lise, Ployon, Estelle, Wilhelm, Bruno, Naffrechoux, E., Dorioz, Jean-Marcel, Montuelle, Bernard, Arnaud, Fabien, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Moléculaire et Environnement (LCME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Université Grenoble Alpes (UGA), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), European Geosciences Union (EGU). Göttingen, DEU., Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
vignoble, analyse de sédiment, [SDE]Environmental Sciences, pesticide, micropolluant
Abstract

Worldwide increase of pesticides uses in agriculture has been growing over the past decades but their long-term fate and effects on environment and ecosystem are poorly understood. Here, we present a retro-observation approach based on lake sediment record to monitor micropollutants and to evaluate the long term impact of pesticides treatments on a vineyard catchment in Savoie (France). In this study, we combined sedimentological and geochemical analyses to reconstruct the recent history of wine practices. The sediment sequence chronology, based on short-live radionuclides (210Pb/137Cs), provides a well constrain continuous age-depth relationship covering to the last century. Over this period, we reconstruct the succession of fungicides, insecticides and herbicides in relation to the appearance of new chemical substances and the banning of old ones. The first use of fungicide began at the end of the 19th century with the Bordeaux mixture (Cu). After the World War II, we observed an intensification of fungicides treatment against mildew, powdery mildew, Botrytis fungi and black rot with specific molecules succession. Insecticides used in vineyard treatment against tetranychid and eriophyid mites were observed since 1940 with a main increase in 1970. Dicofol, Bromopropylate, Bifenthrin succeed to DDT banning in 1972, but a secondary source of DDT appeared at the early of 90's. The first herbicides use was observed between 1960 and 1970 with the presence of Triazine metabolite (pre-emergence herbicide) and high value of AMPA (Glyphosate metabolite, Roundup® ), used as post-emergence herbicide, were found since 1990. Two sedimentation rate increases in 1973 and 1994 could be directly assigned to wine practices. In early 70's, heavy farm machinery associated to the first application of pre-emergence herbicide, induced a first increase of soil erosion. In early 90's, post-emergence herbicide (Roundup® ) treatment had a stronger impact on soil erosion with a huge contaminated sediment export. This latter, associated with high AMPA flux, is synchronous to the re-emergence of banned pesticides with the new source of DDT and its aerobic metabolites (DDE) probably stocked in vineyard soil. Over the last years, the decrease of pesticides concentration may be probably related to French and European policies against micropollutant substances in agriculture

Published
2014

44. Evolution Holocène des pédopaysages du lac de La Thuile (Massif des Bauges) : Impacts climatiques et anthropiques à l’étage montagnard

Author

Bajard, Manon, Sabatier, Pierre, Poulenard, Jérôme, David, Fernand, Arnaud, Fabien, Develle, Anne-Lise, Leloup-Besson, Anouk, Reyss, J.L., Fanget, Bernard, Malet, Emmanuel, Augustin, Laurent, Crouzet, Christian, Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Océan et Interfaces (OCEANIS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Referent HAL Edytem, Christine Maury, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), and Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])

Subjects
[SDE.BE] Environmental Sciences/Biodiversity and Ecology, [SDE.MCG] Environmental Sciences/Global Changes, [SDE.IE]Environmental Sciences/Environmental Engineering, [SHS.GEO] Humanities and Social Sciences/Geography, [SDE.MCG]Environmental Sciences/Global Changes, [SDE.IE] Environmental Sciences/Environmental Engineering, [SDE.ES] Environmental Sciences/Environmental and Society, ComputingMethodologies_GENERAL, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

Poster

Published
2014

45. Traçage de la matière organique naturelle à l'échelle de bassins versants. Applications

Author

Pepin-Donat, Brigitte, Poulenard, Jérôme, Blondel, Thibaut, Lombard, Christian, Protiere, Myriam, Dudal, Yves, Perrette, Yves, Fanget, Bernard, Miege, Cecile, delannoy, jean-jacques, Dorioz, Jean-Marcel, EMBLANCH, christophe, Arnaud, Fabien, Giguet-Covex, Charline, Structures et propriétés d'architectures moléculaire (SPRAM - UMR 5819), Institut Nanosciences et Cryogénie (INAC), Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes (UGA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Environnement Méditerranéen et Modélisation des Agro-Hydrosystèmes (EMMAH), Avignon Université (AU)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Institut Nanosciences et Cryogénie (INAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Environnements, Dynamiques et Territoires de Montagne (EDYTEM)

Subjects
[SDE]Environmental Sciences
Abstract

Edytem Equipe Archives Continentales 2011-2015

Published
2014

46. Analyse 3D de la conservation du remplissage détritique de la grotte Roche (Vercors, France)

Author

Thomas, Matthieu, Jaillet, Stéphane, Berthet, Johan, Cailhol, Didier, Fanget, Bernard, Hez, Gabriel, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
analyse 3D, grotte Roche, [SDE.IE]Environmental Sciences/Environmental Engineering, [SDE.MCG]Environmental Sciences/Global Changes, conservation, remplissage endokarstique, [SHS.GEO]Humanities and Social Sciences/Geography, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, sédimentologie, Vercors, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

International audience; 3D analysis of the conservation of the Detrital Deposit of the grotte roche (vercors, france). An important excavation (1993-2008) has been digged in the “grotte Roche” (Vercors) which led to the discovery of new galleries (1608m) and a major stratigraphic profile. This profile displays interesting sedimentary forms such as progradation, crisscross deposits, erosional surfaces… and interest is as much aesthetic as scientific or educational. A non-destructive analysis, based on a series of laserscanning surveys and field observations, allowed a better understanding of the dynamics of such a deposit and the ways of its erosion associated with excavation and current visitors frequentation. The numerical results show that while the impact of caving practice is not negligible, it should be balanced with the discovery of the underground object and its scientific and educational value. This type of study shows that today it is important to carry on further assessment on the knowledge and the preservation of the underground environments, including their deposits.; La grotte Roche (Vercors) a fait l’objet d’une importante désobstruction spéléologique (1993-2008) qui a permis de mettre au jour 1 608 m de nouvelles galeries ainsi qu’une importante coupe stratigraphique au droit du chantier de désobstruction. Celle-ci présente des formes sédimentaires intéressantes : progradation, dépôts entrecroisés, surfaces d’érosion… et son intérêt est autant esthétique que scientifique ou pédagogique. Une analyse, non destructive, basée sur une série de relevés lasergrammétriques et sur des observations de terrain, a permis de mieux comprendre la dynamique de ce dépôt et les modalités de son démantèlement associé à la désobstruction et à la fréquentation actuelle. Les résultats chiffrés montrent que si l’impact de la pratique spéléologique est loin d’être négligeable, elle doit être mise en regard de la mise au jour de l’objet souterrain et de son intérêt scientifique et pédagogique. Ce type d’étude montre qu’il importe aujourd’hui de pousser plus loin encore la réflexion sur la connaissance et la conservation des milieux souterrains et notamment de leurs dépôts.

Published
2014

47. Evolution tardi-glaciaire et holocene d'un bassin versant de moyenne montagne (lac de la Thuile, massif des Bauges) : impacts climatique et anthropique

Author

Sabatier, Pierre, Bajard, Manon, David, Fernand, Poulenard, Jérôme, Arnaud, Fabien, Develle, Anne-Lise, Leloup-Besson, Anouk, Reyss, Jean-Louis, Fanget, Bernard, Malet, Emmanuel, Arnaud, Daniel, Augustin, Laurent, Crouzet, Christian, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Océan et Interfaces (OCEANIS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Division technique INSU/SDU (DTI), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences de la Terre (ISTerre), Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Environnements, Dynamiques et Territoires de Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Collège de France (CdF)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Institut National de la Recherche Agronomique (INRA), Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Centre National de la Recherche Scientifique (CNRS), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), and Maury, Christine

Subjects
[SDU] Sciences of the Universe [physics], [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU.OCEAN] Sciences of the Universe [physics]/Ocean, Atmosphere, [SDU]Sciences of the Universe [physics]
Published
2013

48. Age et modalites de l'effondrement à l'origine du lac de Lauvitel, (vallée de l'oisans, 1530 m). Apports d'une approche couplée : datations cosmogéniques, sismique réflexion et carottages lacustres

Author

Fouinat, Laurent, Sabatier, Pierre, Arnaud, Fabien, Chaumillon, Eric, Schoeneich, Philippe, Carcaillet, Julien, Delunel, Romain, Fanget, Bernard, Malet, Emmanuel, Environnements, Dynamiques et Territoires de la Montagne (EDYTEM), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), LIttoral ENvironnement et Sociétés - UMR 7266 (LIENSs), Université de La Rochelle (ULR)-Centre National de la Recherche Scientifique (CNRS), Pacte, Laboratoire de sciences sociales, Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Sciences Po Grenoble - Institut d'études politiques de Grenoble (IEPG)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF), Laboratoire de Géodynamique des Chaines Alpines (LGCA), Observatoire des Sciences de l'Univers de Grenoble (OSUG), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut des Sciences de la Terre (ISTerre), Université Grenoble Alpes (UGA)-Centre National de la Recherche Scientifique (CNRS)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut national des sciences de l'Univers (INSU - CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-PRES Université de Grenoble-Institut de recherche pour le développement [IRD] : UR219-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), LIttoral ENvironnement et Sociétés - UMRi 7266 (LIENSs), Pacte, Laboratoire de sciences sociales (PACTE), Université Pierre Mendès France - Grenoble 2 (UPMF)-Université Joseph Fourier - Grenoble 1 (UJF)-Sciences Po Grenoble - Institut d'études politiques de Grenoble (IEPG)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement [IRD] : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMethodologies_GENERAL
Abstract

Poster

Published
2013

49. Erosion record in Lake La Thuile sediments (Prealps, France): Evidence of montane landscape dynamics throughout the Holocene

Author

Bajard, Manon, primary, Sabatier, Pierre, additional, David, Fernand, additional, Develle, Anne-Lise, additional, Reyss, Jean-Louis, additional, Fanget, Bernard, additional, Malet, Emmanuel, additional, Arnaud, Daniel, additional, Augustin, Laurent, additional, Crouzet, Christian, additional, Poulenard, Jérôme, additional, and Arnaud, Fabien, additional

Published
2015
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