30 results on '"Landemaine, Valentin"'
Search Results
2. Analysis of off-site economic costs induced by runoff and soil erosion: Example of two areas in the northwestern European loess belt for the last two decades (Normandy, France)
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Patault, Edouard, Ledun, Jérôme, Landemaine, Valentin, Soulignac, Arnaud, Richet, Jean-Baptiste, Fournier, Matthieu, Ouvry, Jean-François, Cerdan, Olivier, and Laignel, Benoit
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- 2021
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3. Diagnostic multiscalaire de la vulnérabilité des aquifères karstiques face au risque ruissellement-érosion
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MAURIE, Aurélien, primary, PATAULT, Edouard, additional, LANDEMAINE, Valentin, additional, Jérôme, LEDUN, additional, DAVID, Pierre-Yann, additional, CERDAN, Olivier, additional, DEMAN, Marielle, additional, MARDUEL, Benoit, additional, FOSSA, Manuel, additional, CLOSET, Jean-François, additional, OUVRY, Jean-François, additional, PENNEQUIN, Didier, additional, and FOURNIER, Mathieu, additional
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- 2023
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4. Lessons learnt on the impact of an unprecedented soil decontamination program in Fukushima on contaminant fluxes
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Vandromme, Rosalie, primary, Hayashi, Seiji, additional, Tsuji, Hideki, additional, Evrard, Olivier, additional, Grangeon, Thomas, additional, Landemaine, Valentin, additional, Laceby, John Patrick, additional, Wakiyama, Yoshifumi, additional, and Cerdan, Olivier, additional
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- 2023
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5. In situ high frequency long term measurements of suspended sediment concentration in turbid estuarine system (Seine Estuary, France): Optical turbidity sensors response to suspended sediment characteristics
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Druine, Flavie, Verney, Romaric, Deloffre, Julien, Lemoine, Jean-Philippe, Chapalain, Marion, Landemaine, Valentin, and Lafite, Robert
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- 2018
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6. Effectiveness of an unprecedented decontamination program on river sediment and radioactive contaminant fluxes
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Vandromme, Rosalie, primary, Hayashi, Seiji, additional, Tsuji, Hideki, additional, Evrard, Olivier, additional, Grangeon, Thomas, additional, Landemaine, Valentin, additional, Laceby, Patrick, additional, Wakiyama, Yoshifumi, additional, and Cerdan, Olivier, additional
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- 2023
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7. Climatic against land use variability impact on soil erosion in two contrasting environments
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Cerdan, Olivier, primary, Landemaine, Valentin, additional, Foucher, Anthony, additional, Desprats, Jean-François, additional, Evrard, Olivier, additional, Grangeon, Thomas, additional, Chabert, Clément, additional, and Salvador-Blanes, Sébastien, additional
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- 2023
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8. Impact of rapid deforestation and conversion of traditional agricultural practices into food crop production on land and water degradation: a case study from Mayotte Island, Indian Ocean, France (2011-2022)
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Foucher, Anthony, primary, Evrard, Olivier, additional, Rabiet, Laura, additional, Cerdan, Olivier, additional, Landemaine, Valentin, additional, Vitter, Maxime, additional, and Desprats, Jean-François, additional
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- 2023
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9. Simulating sediment discharge at water treatment plants under different land use scenarios using cascade modelling with an expert-based erosion-runoff model and a deep neural network
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Patault, Edouard, primary, Landemaine, Valentin, additional, Ledun, Jérôme, additional, Soulignac, Arnaud, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2021
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10. Etude de l'érosion des sols dans le vignoble de la Corse Année 3 - AOP de Patrimonio
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Landemaine, Valentin
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- 2021
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11. Runoff observatories: from processes analysis to improved modelling
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Grangeon, Thomas, Cerdan, Olivier, Landemaine, Valentin, Vandromme, Rosalie, Desprats, Jean-François, Salvador-Blanes, Sébastien, Vanhooydonck, Pierre, Gaillot, Arthur, Manière, Louis, Pene-Galland, Isabelle, Evrard, Olivier, Foucher, Anthony, Ledieu, Lauriane, Simonneau, Anaëlle, Ouvry, Jean- François, Pak, Lai, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), GéoHydrosystèmes COntinentaux (GéHCO EA6293), Université de Tours (UT), 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), Géochimie Des Impacts (GEDI), 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 d'Orléans - UMR7327 (ISTO), Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Biogéosystèmes Continentaux - UMR7327, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Association Régionale pour l'Etude et l'Amélioration des Sols (AREAS), Fonctionnement agroécologique et performances des systèmes de cultures horticoles (UPR HORTSYS), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Département Performances des systèmes de production et de transformation tropicaux (Cirad-PERSYST), Université de Tours, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Bureau de Recherches Géologiques et Minières (BRGM) (BRGM)-Observatoire des Sciences de l'Univers en région Centre (OSUC), 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)
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ruissellement par saturation ,[SDU]Sciences of the Universe [physics] ,saturation-excess runoff ,soil properties ,rainfall ,[SDE]Environmental Sciences ,ruissellement hortonien ,pluviométrie ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,Infiltration-excess runoff ,propriété des sols - Abstract
International audience; Runoff events are usually very concentrated in both space and time, and are therefore challenging to monitor. They result from the interactions of rainfall characteristics with both soil surface and intrinsic characteristics and catchment morphology. To improve our understanding of this complex process, five observatories were installed to monitor the runoff response of eleven catchments to natural rainfall events. Measurements were performed with a high frequency (≤ 15 min-time step) and over long time periods (1.5 to 11 years). 1640 rainfall-runoff events were extracted from rainfall and discharge time series. Statistical analyses were performed in order to determine significant triggering factors. The rainfall-runoff response of each catchment is highly variable, but some common features were identified across contrasted catchments. Under highly variable soil types, the catchment runoff exhibited contrasted patterns. Soil surface state, and land use were demonstrated to highly affect runoff. The scattering in the rainfall-runoff relationship demonstrated the key role of the initial soil moisture and rainfall characteristics. Lessons learnt from previous studies in these various environments, as well as their consequences on runoff understanding and modelling are discussed.; Le ruissellement est un phénomène épisodique et localisé, donc difficile à mesurer. Il résulte de l'interaction de nombreux facteurs, dont les caractéristiques intrinsèques et de surface du sol, la morphologie du bassin versant, mais également les caractéristiques pluviométriques. Afin d'améliorer la compréhension de la genèse et de la propagation du ruissellement au sein de bassins versants de tête, cinq observatoires du ruissellement sont présentés, incluant 11 bassins versants. Pour chacun d'entre eux, la pluie et le ruissellement sont mesurés sur le terrain à haute fréquence (≤ 15 min) pendant des durées longues (1,5 à 11 ans). 1640 évènements pluvio-ruisselants sont extraits de ces chroniques en continu et statistiquement analysés, afin de cerner les facteurs influant significativement le ruissellement. La réponse ruisselante de chaque bassin versant est extrêmement complexe mais permet d'identifier des comportements communs. L'importance des caractéristiques des sols est montrée, ainsi que celle de leur occupation, de leurs états de surface et état hydrique. La dispersion de la relation pluie-débit observée au sein de chacun des observatoires permet par ailleurs de montrer et de quantifier l'impact des caractéristiques pluviométriques sur la lame d'eau ruisselée. Les leçons tirées de chacun des observatoires et leurs conséquences sur la compréhension et la modélisation du ruissellement dans différents contextes sont discutées.
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- 2020
12. Analysis of off-site economic costs induced by runoff and soil erosion: example of two areas in the northwestern European loess belt for the last two decades (Normandy, France)
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Patault, Edouard, primary, Ledun, Jérôme, additional, Landemaine, Valentin, additional, Soulignac, Arnaud, additional, Richet, Jean-Baptiste, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2021
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13. Analyse coût-bénéfice du programme d’actions visant à réduire les impacts du ruissellement et de l’érosion en Haute-Normandie : évaluation des actions passées et projections futures sur le bassin versant de la Lézarde
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Patault, Edouard, primary, Soulignac, Arnaud, additional, Landemaine, Valentin, additional, Ledun, Jérôme, additional, Allard, Erwan, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2021
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14. Evaluation de l'efficacité des politiques publiques pour les actions visant à réduire les impacts du ruissellement et de l'érosion en Haute-Normandie
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Patault, Edouard, Jérôme, Ledun, Landemaine, Valentin, Soulignac, Arnaud, Richet, Jean-Baptiste, Fournier, Matthieu, Rinaudo, Jean-Daniel, Ouvry, Jean François, Cerdan, Olivier, Laignel, Benoît, 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), Association Régionale pour l'Etude et l'Amélioration des Sols (AREAS), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Université de Rouen NormandieBRGMAREASAgence de l'Eau Seine-NormandieConseil Départemental de Seine-MaritimeConseil Départemental de l'Eure, Université de Rouen Normandie - UMR CNRS 6143 M2C, BRGM, AREAS, and EVAPORE
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[SDE.IE]Environmental Sciences/Environmental Engineering ,[SDE.MCG]Environmental Sciences/Global Changes ,[SDE]Environmental Sciences ,[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDE.ES]Environmental Sciences/Environmental and Society - Published
- 2020
15. Les observatoires du ruissellement : comprendre les processus pour améliorer les modélisations
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Grangeon, Thomas, primary, Cerdan, Olivier, additional, Landemaine, Valentin, additional, Vandromme, Rosalie, additional, Desprats, Jean-François, additional, Salvador-Blanes, Sebastien, additional, Vanhooydonck, Pierre, additional, Gaillot, Arthur, additional, Maniere, Louis, additional, Pene-Galland, Isabelle, additional, Evrard, Olivier, additional, Foucher, Anthony, additional, Ledieu, Lauriane, additional, Simonneau, Anaëlle, additional, Ouvry, Jean-François, additional, and Pak, Lai Ting, additional
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- 2020
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16. Predicting Sediment Discharge at Water Treatment Plant Under Different Land Use Scenarios Coupling Expert-Based GIS Model and Deep Neural Network
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Patault, Edouard, primary, Landemaine, Valentin, additional, Ledun, Jérôme, additional, Soulignac, Arnaud, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2020
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17. Implementation of soft hydraulic conservation measures: are we done with soil erosion?
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Cerdan, Olivier, primary, Landemaine, Valentin, additional, Vandromme, Rosalie, additional, and Grangeon, Thomas, additional
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- 2020
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18. Integrating Deep Learning to GIS Modelling: An Efficient Approach to Predict Sediment Discharge at Karstic Springs Under Different Land-Use Scenarios
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Patault, Edouard, primary, Landemaine, Valentin, additional, Ledun, Jérôme, additional, Soulignac, Arnaud, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2020
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19. Coupled Modeling of Hydro-Sedimentary Transfer Processes and Socio-Economic Dynamics Evaluating Public Policies to Control Runoff and Erosion: Case Study in Normandy (France)
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Patault, Edouard, primary, Ledun, Jérôme, additional, Landemaine, Valentin, additional, Soulignac, Arnaud, additional, Richet, Jean-Baptiste, additional, Ramaekers, Fanny, additional, Cabaz, Boris, additional, Cikowski, Natacha, additional, Fournier, Matthieu, additional, Ouvry, Jean-François, additional, Rinaudo, Jean-Daniel, additional, Cerdan, Olivier, additional, and Laignel, Benoit, additional
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- 2019
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20. Spatial and temporal dynamics of soil erosion across different landscapes
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Cerdan, Olivier, Landemaine, Valentin, Foucher, Anthony, Evrard, Olivier, Grangeon, Thomas, Vandromme, Rosalie, Salvador-Blanes, Sebastien, Pak, Lai-Ting, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), GéoHydrosystèmes COntinentaux (GéHCO EA6293), Université de Tours, 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), Géochimie Des Impacts (GEDI), 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 Francois Rabelais [Tours], Association Régionale pour l'Etude et l'Amélioration des Sols (AREAS), Université de Tours (UT), 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 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)
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[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2018
21. Tracing the sources and dynamics of contaminated sediment in coastal rivers draining the main Fukushima radioactive fallout plume using gamma-emitting radionuclides and carbon/nitrogen stable isotopes (2011-2017)
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Evrard, O., Laceby, J. Patrick, Onda, Yuichi, Hayashi, Seiji, Tsuji, Hideki, Huon, Sylvain, Lefèvre, Irène, Jaegler, Hugo, Landemaine, Valentin, Vandromme, Rosalie, Cerdan, Olivier, 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), Géochimie Des Impacts (GEDI), 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), Alberta Environment and Parks (AEP), Université de Tsukuba = University of Tsukuba, National Institute for Environmental Science [Fukushima], Institut d'écologie et des sciences de l'environnement de Paris (iEES), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Recherche Agronomique (INRA), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), ANR-11-RSNR-0002,AMORAD,AMORAD1(2011), ANR-11-JAPN-0001,TOFU,Traçage des conséquences environnementales du tsunami provoqué par le séisme de TOhoku et de l'accident de FUkushima(2011), 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), Institut National de la Recherche Agronomique (INRA)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS), Evrard, Olivier, AMORAD1 - - AMORAD2011 - ANR-11-RSNR-0002 - RSNR - VALID, and Great Tohoku Earthquake - Traçage des conséquences environnementales du tsunami provoqué par le séisme de TOhoku et de l'accident de FUkushima - - TOFU2011 - ANR-11-JAPN-0001 - JAPON - VALID
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[SDE] Environmental Sciences ,[SDE.MCG] Environmental Sciences/Global Changes ,[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,[SDE.MCG]Environmental Sciences/Global Changes ,[SDE]Environmental Sciences ,[SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study ,[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment - Abstract
International audience; Fieldwork was conducted every 6 months between 2011 and 2017 to monitor the dispersion of sediment contaminated with radionuclides in rivers draining the main Fukushima radioactive pollution plume (~500 km²). Fine sediment was systematically collected at the same locations (n=47) and analysed for gamma-emitting radionuclides (including 137Cs and 110mAg). A selection of samples was also analysed for carbon/nitrogen concentrations and isotopes. Organic matter analyses showed that paddy fields provided the main source of contaminated sediment to the rivers shortly after the accident. The spatial variations of the 110mAg:137Cs activity ratio in soils were used to demonstrate the very rapid export of sediment to the Pacific Ocean. However, this tool could only be used during the first campaigns, because of the quick decay of 110mAg. Overall, radiocesium concentrations measured in sediment deposits decreased by ~90% between 2011 and 2017. This may be explained by remediation works, by a massive export of material during typhoons and by the occurrence of landslides or channel bank erosion that supply material sheltered from the Fukushima fallout to the river network. Consequently, 6 years after the accident, most of the residual radioactive contamination is found in forests and in dam reservoirs. The analysis of sediment cores collected in a reservoir confirmed the significant storage of contaminated material in these lakes and that paddy fields provided their main source. Ongoing research focuses on the development of a soil erosion model and on the quantification of the impact of remediation works.
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- 2018
22. Contribution of bank erosion to the sediment budget of a drained agricultural lowland catchment
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Cerdan, Olivier, Foucher, Anthony, Vandromme, Rosalie, Salvador-Blanes, Sébastien, Gay, Aurore, Landemaine, Valentin, Evrard, O., Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), GéoHydrosystèmes COntinentaux (GéHCO EA6293), Université de Tours (UT), 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), Géochimie Des Impacts (GEDI), 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), Cerdan, Olivier, Université de Tours, 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)
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" ,[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,sediment ,bank erosion ,[SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study ,[SDV.SA.SDS] Life Sciences [q-bio]/Agricultural sciences/Soil study ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment ,[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment - Abstract
International audience; Following the shift towards more intensive agriculture in cultivated lowlands in Europe, field sizes have increased and stream valley meanderings have been removed and realigned along new straight field borders. These modifications have led to profound alterations of the hydromorphology of the streams. To test the impact of these modifications, the long-term and current volumes of sediment originating from stream banks were calculated as they provided potential sources of sediment in a large pond located at the outlet of a small agricultural lowland basin under strong anthropogenic pressure. Bank erosion was measured using several methodologies, i) over a short period using a set of erosion pins along a small stream (1400 m long) to quantify the material exported during a single winter season (2012/2013); ii) over the last 69 years using an original approach involving the comparison of a compilation of three-dimensional historical stream redesign plans from 1944 vs. new measurements conducted in 2013 (DGPS and LiDAR data); iii) over several decades by using tracers (137Cs) that can differentiate between surface and subsoil erosion. At the catchment scale, total sediment exports were estimated from 1945 to 2013 combining seismic imagery and core dating in the lake. Sediment exports decreased with time, from 300 t. km–2.yr–between 1954 and 1980 to 95 t. km–2.yr–1 between 1980 and 2013. Today, erosion rates recorded at the outlet of the catchment vary between 90–102 t.km–2.yr–1. Therefore, the order of magnitude of the mean export rate is approximately 180 t. km–2.yr–1 for the last 70 years.The contribution of channel banks to this sediment export was the highest (~30%) between 1954 and 1980 when the ditches were constructed. For the entire period since the landscape modification, the contribution of bank erosion is lower but still reaches 20%. Bank erosion can therefore be considered as a significant contributor to the sediment budget of the lowland catchments that have been redesigned after the 2nd world war in Western Europe.
- Published
- 2017
23. Predicting Sediment Discharge at Water Treatment Plant Under Different Land Use Scenarios Coupling Expert-Based GIS Model and Deep Neural Network.
- Author
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Patault, Edouard, Landemaine, Valentin, Ledun, Jérôme, Soulignac, Arnaud, Fournier, Matthieu, Ouvry, Jean-François, Cerdan, Olivier, and Laignel, Benoit
- Abstract
Excessive sediment discharge at karstic springs and thus, water treatment plants, can be highly disruptive. It is essential for catchment stakeholders and drinking water supplier to reduce the impact of sediment on potable water supply, but their strategic choices must be based on simulations, integrating surface and groundwater transfers, and taking into account possible changes in land use. Karstic environments are particularly challenging as they face a lack of accurate physical description for the modelling process, and they can be seen as a black-box due to the non-linearity of the processes generating sediment discharge. The aim of the study was to assess the sediment discharge variability at a water treatment plant according to multiple realistic land use scenarios. To reach that goal, we developed a new coupled modelling approach with an erosion-runoff GIS model (WaterSed) and a deep neural network. The model was used in the Radicatel catchment (106 km
2 in Normandy, France) where karstic spring water is extracted to a water treatment plant. The sediment discharge was simulated for five designed storm projects under current land use and compared to three land use scenarios (baseline, ploughing up of grassland, eco-engineering, best farming practices). Daily rainfall time series and WaterSed modelling outputs extracted at connected sinkholes were used as input data for the deep neural network model. The model structure was found by a classical trial and error procedure, and the model was trained on two significant hydrologic years. Evaluation on a test set showed a good performance of the model (NSE = 0.82), and the application of a monthly-backward chaining nested cross validation revealed that the model is able to generalize on new datasets. Simulations made for the three land use scenarios suggested that ploughing up 33 % of grasslands would not increase significantly sediment discharge at the water treatment plant (5 % in average). In the opposite, eco-engineering and best farming practices will significantly reduce sediment discharge at the water treatment plant (respectively in the range of 10-44 and 24-61 %). The coupling of these two strategies is the most efficient since it affects the hydro-sedimentary production and transfer processes (decreasing sediment discharge from 40 to 80 %). The coupled modelling approach developed in this study offers interesting opportunities for sediment discharge prediction at karstic springs or water treatment plant under multiple land use scenarios. It also provides robust decision-making tools for land use planning and drinking water suppliers. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
24. Connectivity and scale effect on sediment fluxes dynamic from the hillslope to the river basin
- Author
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Cerdan, Olivier, Landemaine, Valentin, Vandromme, Rosalie, Gay, Aurore, Laignel, Benoît, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), 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), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA), AMORAD, Centre National de la Recherche Scientifique (CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Caen Normandie (UNICAEN), and Normandie Université (NU)
- Subjects
sediment ,connectivity ,river ,[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,hillslope - Abstract
International audience; The phenomena of erosion and sediment transport are often observed with a time lag and / or space within a watershed, especially between the upstream and downstream areas. This difference between runoff and erosion assessments that depends on the size of observation is commonly called the "scale effect". This effect has often been studied globally and reduced runoff and erosion rates are generally reported as one moves from the local to the regional level.To quantify the scale effect, local erosion models are often linked to the empirical concept of SDR (Sediment Delivery Ratio): the ratio of exported sediment at the outlet of a drainage system on the gross erosion that occurred locally. This empirical parameter is used as a connectivity factor to estimate the contribution of net soil losses to sedimentary basins exports. A recent renewed interest on these topics has led the development of more or less elaborate variants that propose a conceptualization of the (es) connectivity (s) of the landscape to describe the sedimentary flows within watersheds.In general, these concepts allow apprehending the spatial variability of flow in heterogeneous environments and for events / climates not too extreme. Their use is more difficult when the flows are constrained by the production process. A limit also appears when trying to cover too large a range of spatial scales, because beyond a spatial succession of (re) detachment and deposition processes a new nature of process can emerge. We will rely on several measured database of erosion / sediment transport at different scales and in diverse geomorphological contexts to illustrate and discuss the relevance of these concepts.
- Published
- 2016
25. Soil erosion and sediment transfers on the watersheds of the western Paris Basin: analysis, quantification and modelling at a pluri-annual time scale
- Author
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Landemaine, Valentin, 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), Normandie Université, Benoit Laignel, Olivier Cerdan, Matthieu Fournier, and Weill, Pierre
- Subjects
Effet d’échelle ,[SDU.STU.GM] Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,Scale effect ,Érosion ,Watershed ,Surface runoff ,[SDU.ENVI] Sciences of the Universe [physics]/Continental interfaces, environment ,Modelling ,Ruissellement ,Bassin versant ,Modélisation ,[SDU.STU.HY] Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDU.STU.GM]Sciences of the Universe [physics]/Earth Sciences/Geomorphology ,[SDU.STU.HY]Sciences of the Universe [physics]/Earth Sciences/Hydrology ,[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment - Abstract
The impacts of accelerated soil erosion are particularly important on the loess plateaux of Normandy, and are therefore studied since several decades. The works performed at the scale of the agriculture plot show erosion rates among the greatest in Europe, as a consequence of intensive agriculture practices on unstructured loamy soils, especially vulnerable to surface water runoff and erosion., Les impacts de l’érosion accélérée des sols sont particulièrement présents au niveau des plateaux lœssiques normands, et sont à ce titre étudiés depuis plusieurs décennies. Les travaux menés à l’échelle de la parcelle agricole montrent des taux d’érosion parmi les plus élevés d’Europe en raison d’une agriculture intensive sur sols lœssiques peu structurés particulièrement sensibles au ruissellement et à l’érosion. Cependant, les premiers bilans d’export réalisés à l’exutoire de quelques bassins versants normands indiquent des taux d’érosion extrêmement faibles en comparaison. Ces différences notables sont liées au stockage des produits érodés au sein du bassin versant avec le changement d’échelle spatiale. Toutefois, la connaissance de l’effet d’échelle restait jusqu’à présent limitée aux bassins versants élémentaires. Ce travail de thèse propose d’étendre notre compréhension du fonctionnement global de ces hydrosystèmes, par une étude approfondie du continuum sédimentaire, depuis les zones de production du ruissellement et de l’érosion sur les parcelles agricoles, jusqu’à l’exutoire du bassin versant.
- Published
- 2016
- Full Text
- View/download PDF
26. Archivages croisés de la dynamique hydro-sédimentaire et de l'histoire des activités polluantes dans le bassin de la Seine : le point sur une carotte sédimentaire prélevée dans l'Eure
- Author
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Patault, Edouard, Debret, Maxime, Copard, Yoann, Sabatier, Pierre, Landemaine, Valentin, Desmet, M., Fournier, Matthieu, Portet-Koltalo, Florence, Reyss, J.L., Laignel, Benoît, 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), 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]), Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), 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), 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), 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 Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-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)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Université Le Havre Normandie (ULH), 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)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (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), 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]Environmental Sciences ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
- Published
- 2015
27. Corrigendum to “Morphological evolution of a rural headwater stream after channelisation” [Geomorphology 230 (2015) 125-137]
- Author
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Landemaine, Valentin, primary, Gay, Aurore, additional, Cerdan, Olivier, additional, Salvador-Blanes, Sébastien, additional, and Rodrigues, Stéphane, additional
- Published
- 2015
- Full Text
- View/download PDF
28. Morphological evolution of a rural headwater stream after channelisation
- Author
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Landemaine, Valentin, primary, Gay, Aurore, additional, Cerdan, Olivier, additional, Salvador-Blanes, Sébastien, additional, and Rodrigues, Stéphane, additional
- Published
- 2015
- Full Text
- View/download PDF
29. The scale dependency of erosion and runoff for two agricultural catchments in the Western Paris Basin, France.
- Author
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Cerdan, Olivier, Landemaine, Valentin, Laignel, Benoit, Evrard, Olivier, Salavador-Blanes, Sébastien, Grangeon, Thomas, Vandromme, Rosalie, and Laceby, Patrick
- Subjects
- *
AGRICULTURAL pollution , *SOIL erosion , *EROSION , *GEOMORPHOLOGY , *WATERSHEDS , *SOIL depth , *SOIL topography - Abstract
A major challenge in geomorphology is reconciling the disparity between runoff coefficients and erosion rates from the field to the catchment scale. In the European loess belt, a decrease of runoff coefficients and erosion rates occurs with increasing spatial scales. Indeed, it is important to understand the scale dependency of run-off and erosion to manage the off-site impacts of accelerated soil erosion. Accordingly, a continuous simulation of the scale dependency of runoff and erosion, from the field scale to the catchment scale (100 – 1000 km²) was conducted with the Water and Sediment (WaterSed) model for two catchments (Andelle-756 km², and Austreberthe-214 km²) over 12 years (>1000 events). Scale effects were evident with a 100-fold decrease in runoff coefficients and sediment delivery ratios between the field scale and the catchment scale. In spite of a low variability of the annual rainfall (19%), the inter-annual variability of the runoff volume (37%) and erosion rates (92%) at catchment outlets were high. The inter-annual variability of runoff and erosion was closely linked to the number of extreme events per year and their distribution through the year, in particular during periods with highly crusted soil surface states. For these high magnitude events, a complex distributed modelling approach was not necessary as the ability of the soil surface and of the landscape to retain overland flows are largely exceeded. The seasonality of soil surface characteristics also affected the scale dependency of runoff and erosion, from the field scale to the catchment scale. However, this is only observed up to a certain spatial extent, i.e. where hillslope erosion processes are governed by hortonian overland flow. When saturation flows are generated, topography and soil depth become the dominant factors. Understanding runoff and sediment response at different scales should focus on the location and amount of runoff and sediment production within the catchment and the capacity of the downstream flow path to retain or transfer overland flow and sediment. Furthermore, this study demonstrates the need to implement model that represent both hortonian and saturation flows when simulating erosion events at the catchment scale. [ABSTRACT FROM AUTHOR]
- Published
- 2019
30. Uncontrolled deforestation and population growth threaten a tropical island's water and land resources in only 10 years.
- Author
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Foucher A, Evrard O, Rabiet L, Cerdan O, Landemaine V, Bizeul R, Chalaux-Clergue T, Marescaux J, Debortoli N, Ambroise V, and Desprats JF
- Subjects
- Tropical Climate, Biodiversity, Humans, Madagascar, Comoros epidemiology, Agriculture methods, Ecosystem, Conservation of Natural Resources, Population Growth, Islands
- Abstract
Rapid demographic growth in tropical islands can exacerbate conflicts and pressures on natural resources, as illustrated by the French island of Mayotte where resources are limited. In only 10 years, uncontrolled migration and population growth (+80% of population between 2002 and 2021) have led to a pronounced 3600% increase in deforestation rates (2010-2014) and an intensification of agricultural practices, escalating conflicts over limited land, water, and biodiversity resources. Implementing an original multi-proxy approach to sediment cores, our study reveals a staggering 300% acceleration in erosion during the first wave of migration (2011-2015), followed by a further 190% increase (2019-2021) under sustained migratory and demographic pressures. Sedimentary DNA analysis provided insights into increased connectivity and community changes. By 2050, the population of this region will increase by 74 and 103%, in Comoros and Madagascar islands, respectively. Urgent conservation measures are needed to avoid major socio-environmental crises and to protect resources for future generations.
- Published
- 2024
- Full Text
- View/download PDF
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