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6 results on '"Durand, Roxanne"'

1. Impact of the 2019 typhoons on sediment source contributions and radiocesium concentrations in rivers draining the Fukushima radioactive plume, Japan

Author

Evrard, Olivier, Durand, Roxanne, Nakao, Atsushi, Patrick Laceby, J., Lefèvre, Irène, Wakiyama, Yoshifumi, Hayashi, Seiji, Asanuma-Brice, Cécile, and Cerdan, Olivier

Subjects
Source tracing, Sediment fingerprinting, Nuclear accident, Catchment, Cesium-137 ($^{137}$Cs), Geophysics. Cosmic physics, QC801-809, Chemistry, QD1-999, Geology, QE1-996.5
Abstract

The Fukushima nuclear accident in March 2011 generated a 3000 km$^{2}$ plume of soils heavily contaminated with $^{137}$Cs. Decontamination was completed early in 2019. Typhoon Hagibis was the first extreme event that occurred in the region after decontamination. Its impact on sediment sources and sediment $^{137}$Cs contamination was investigated through the application of a sediment fingerprinting procedure using spectrocolorimetry and geochemical properties. Sediment deposits ($n=24$) were collected in the Mano and Niida River catchments after the 2019 typhoons, and their signature was compared to that of potential sources (e.g., cropland, forests, and subsurface; $n=57$). Results demonstrate the dominance of cropland as the main source of sediment (mean: 54%) followed by forests (41%) with much lower contributions of subsurface material (5%). Overall, $^{137}$Cs concentrations in sediment were on average 84%–93% lower than the levels recorded after the accident in 2011, which demonstrates the effectiveness of cropland decontamination.

Published
2020
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3. What were the main sources of sediment and associated radiocesium transported during the heavy 2019 typhoons in rivers draining the main Fukushima radioactive plume, Japan ?

Author

Evrard, Olivier, primary, Durand, Roxanne, additional, Nakao, Atsushi, additional, Laceby, J. Patrick, additional, Lefèvre, Irène, additional, Wakiyama, Yoshifumi, additional, Hayashi, Seiji, additional, Asanuma-Brice, Cécile, additional, and Cerdan, Olivier, additional

Published
2021
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4. Potential of spectrocolorimetry to trace sediment sources in coastal catchments draining the main Fukushima radioactive pollution plume (2011-2018)

Author

Evrard, Olivier, Durand, Roxanne, Foucher, Anthony, Tiecher, Tales, Sellier, Virginie, Onda, Yuichi, Lefèvre, Irène, Cerdan, Olivier, Laceby, J., 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), Universidade Federal do Rio Grande do Sul [Porto Alegre] (UFRGS), Université de Tsukuba = University of Tsukuba, Bureau de Recherches Géologiques et Minières (BRGM) (BRGM), Alberta Environment and Parks (AEP), 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.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, [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; Spectrocolorimetric properties provide a quick, low-cost and non-destructive alternative to the measurement of geochemical and organic matter parameters. Their potential to discriminate between forest, cultivated and subsoil sources was tested in soils and sediment collected in coastal catchments draining the main radioactive pollution plume of Fukushima Prefecture, Japan. Fifteen spectrocolorimetric properties were determined in potential source (n=37) and sediment (n=400) samples collected during 13 campaigns from 2011-2017 in two catchments (covering a total surface area of 450 km$^2$) draining the main radioactive pollution plume. Potential sources included topsoil from forest and cropland sources along with subsoil material originating from landslides, channel banks and the decontamination of cultivated areas. The optimum set of parameters used in the mixed linear model to calculate the sediment source contributions was obtained through the use of a range test, the Kruskal-Wallis H-test, and a linear discriminant analysis. Nine colour parameters correctly classified 100% of the source samples (forest, subsoil and cultivated sources). The results illustrate that cultivated landscapes were the main source of sediment to these river systems (mean 56%, SD 34%) followed by subsoil (mean 26%, SD 16%) and forest sources (mean 21%, SD 24%). However, these contributions strongly varied over time, with a peak of subsoil contributions (mean 57%, SD 17%) in Fall 2015, coinciding with the occurrence of a typhoon after the remediation works. These original results demonstrate that spectrocolorimetric measurements provide a powerful tool for the monitoring of the effectiveness of remediation works in this post-accidental context.

Published
2019

5. Quantifying the contribution of subsurface sediment sources using spectrocolorimetry: A case study in coastal catchments exposed to Fukushima radioactive fallout, Japan

Author

Evrard, Olivier, Durand, Roxanne, Sellier, Virginie, Laceby, J., Onda, Yuichi, 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), Géochimie Des Impacts (GEDI), 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 Tsukuba = University of Tsukuba, ANR-11-RSNR-0002,AMORAD,AMORAD1(2011), 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 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)

Subjects
[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, [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study, [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces, environment
Abstract

International audience; The accident that occurred at the Fukushima Dai-ichi Nuclear Power Plant (FDNPP) in March 2011 resulted in the formation of a radioactive pollution plume on soils of Northeastern Japan. Among the emitted radionuclides, radiocesium (including Cs-137) is the most problematic substance over the medium to long term, because of its abundance and its relatively long half-life. The soils heavily contaminated with Cs-137 are drained by several coastal rivers to the Pacific Ocean, and extensive soil erosion occurring during typhoons may lead to the significant redistribution of these particle-bound radionuclides. To prepare the return of the local populations in the most contaminated areas, the Japanese authorities carried out remediation works consisting in the removal of the 5-cm topsoil layer heavily contaminated with Cs-137. Accordingly, the application of an alternative sediment tracing technique based on the measurement of spectrocolorimetry parameters was investigated to quantify the effectiveness of remediation. These measurements were conducted using a portable diffuse reflectance spectrophotometer (Konica Minolta 2600d) between 360 and 740 nm, with a 10-nm resolution. Potential sources samples corresponded to (i) topsoil collected under forests or paddy fields before remediation works, and (ii) subsoil material originating from channel bank/landslide erosion, or collected in paddy fields after decontamination. Sediment samples consisted of fine material deposited in the main river channel after the main floods and were systematically collected at the same locations every six months, between 2011–2017, in the Mano and Niida River catchments, Fukushima Prefecture. The results showed that the contribution of subsoil to sediment strongly varied across space and throughout time, reflecting the significant impact of decontamination works and the continuous ‒ although minor ‒ contribution of landslides as a perennial source of material transiting rivers in this region of the world. The impact of particle size is discussed through the comparison of measurements conducted on both

Published
2018

6. La fortification du Frankenbourg à Neubois (67)

Author

Féliu, Clément, Chosson, Michaël, Chameroy, Jérémie, Durand, Roxanne, Jodry, Florent, Schneider, Nathalie, Simon, François-Xavier, Tremblay-Cormier, Laurie, Van Es, Marieke, Institut national de recherches archéologiques préventives (Inrap), Archéologie et histoire ancienne : Méditerranée - Europe (ARCHIMEDE), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Ministère de la Culture et de la Communication (MCC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Archéologie Alsace (AA), Römisch-Germanisches Zentralmuseum Mainz, Leibniz-Forschungsinstitut für Archäologie, Centre Michel de Boüard - Centre de recherches archéologiques et historiques anciennes et médiévales (CRAHAM), Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU), Université Bourgogne Franche-Comté [COMUE] (UBFC), Laboratoire Image, Ville, Environnement (LIVE), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Chrono-environnement - CNRS - UBFC (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), Projet financé par le SRA Alsace, l'Inrap, la Communauté de communes de la Vallée de Villé et la Société d'Histoire du Val de Villé., and Inrap / UMR 7044

Subjects
Numismatique gauloise, Porte, [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory, Fortification, Paléo-métallurgie, Numismatique antique, Rempart, Prospections géophysiques, La Tène finale
Abstract

La campagne de fouille de 2018 au Frankenbourg a permis de compléter la fouille du rempart inférieur du site, du fossé qui le précédait et de la porte qui permettait d’accéder au site. Cette dernière se présente sous la forme d’un petit couloir de 4,25 m de long et 6 à 8 m de large, formé par une interruption du rempart. La superstructure qui enjambait l’accès, à l’arrière de ce couloir, était fondée sur 9 poteaux au moins et dessinait deux chaussées. Le fossé, dont la présence a été identifiée dès 2014, et qui a été fouillé en 2017, a été coupé à nouveau au niveau du passage devant lequelil ne s’interrompt pas. Deux sondages ont été ouverts à la mains au niveau du rempart, en direction du sud. Le premier a permis de relever une coupe complète du système défensif, bien que le rempart soit très mal conservé dans ce secteur. Le second n’a pas pu être fouillé complètement. Il montre des niveaux de pierres sans agencement précis, qu’il est difficile d’attribuer à une architecture. Le mobilier, relativement peu abondant, confirme les orientation chronologiques précédentes et permet de placer la construction de la fortification à La Tène finale. Enfin, l’important lot de scories mis au jour depuis 2014 a été étudié dans le cadre d’un master de l’université de Strasbourg qui a montré l’importance des travaux de forge sur le site.

Published
2018

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