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Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons

Summer typhoons and spring snowmelt led to the riverine spread of continental Fukushima fallout to the coastal plains of Northeastern Japan and the Pacific Ocean. Four fieldwork campaigns based on measurement of radioactive dose rates in fine riverine sediment that has recently deposited on channel...

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Autores principales: Evrard, Olivier, Chartin, Caroline, Onda, Yuichi, Lepage, Hugo, Cerdan, Olivier, Lefèvre, Irène, Ayrault, Sophie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3974138/
https://www.ncbi.nlm.nih.gov/pubmed/24694549
http://dx.doi.org/10.1038/srep04574
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author Evrard, Olivier
Chartin, Caroline
Onda, Yuichi
Lepage, Hugo
Cerdan, Olivier
Lefèvre, Irène
Ayrault, Sophie
author_facet Evrard, Olivier
Chartin, Caroline
Onda, Yuichi
Lepage, Hugo
Cerdan, Olivier
Lefèvre, Irène
Ayrault, Sophie
author_sort Evrard, Olivier
collection PubMed
description Summer typhoons and spring snowmelt led to the riverine spread of continental Fukushima fallout to the coastal plains of Northeastern Japan and the Pacific Ocean. Four fieldwork campaigns based on measurement of radioactive dose rates in fine riverine sediment that has recently deposited on channel bed-sand were conducted between November 2011 and May 2013 to document the spread of fallout by rivers. After a progressive decrease in the fresh riverine sediment doses rates between 2011 and early spring in 2013, a fifth campaign conducted in November 2013 showed that they started to increase again after the occurrence of violent typhoons. We show that this increase in dose rates was mostly due to remobilization of contaminated material that was temporarily stored in river channels or, more importantly, in dam reservoirs of the region during the typhoons. In addition, supply of particles from freshly eroded soils in autumn 2013 was the most important in areas where decontamination works are under progress. Our results underline the need to monitor the impact of decontamination works and dam releases in the region, as they may provide a continuous source of radioactive contamination to the coastal plains and the Pacific Ocean during the coming years.
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spelling pubmed-39741382014-04-03 Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons Evrard, Olivier Chartin, Caroline Onda, Yuichi Lepage, Hugo Cerdan, Olivier Lefèvre, Irène Ayrault, Sophie Sci Rep Article Summer typhoons and spring snowmelt led to the riverine spread of continental Fukushima fallout to the coastal plains of Northeastern Japan and the Pacific Ocean. Four fieldwork campaigns based on measurement of radioactive dose rates in fine riverine sediment that has recently deposited on channel bed-sand were conducted between November 2011 and May 2013 to document the spread of fallout by rivers. After a progressive decrease in the fresh riverine sediment doses rates between 2011 and early spring in 2013, a fifth campaign conducted in November 2013 showed that they started to increase again after the occurrence of violent typhoons. We show that this increase in dose rates was mostly due to remobilization of contaminated material that was temporarily stored in river channels or, more importantly, in dam reservoirs of the region during the typhoons. In addition, supply of particles from freshly eroded soils in autumn 2013 was the most important in areas where decontamination works are under progress. Our results underline the need to monitor the impact of decontamination works and dam releases in the region, as they may provide a continuous source of radioactive contamination to the coastal plains and the Pacific Ocean during the coming years. Nature Publishing Group 2014-04-03 /pmc/articles/PMC3974138/ /pubmed/24694549 http://dx.doi.org/10.1038/srep04574 Text en Copyright © 2014, Macmillan Publishers Limited. All rights reserved http://creativecommons.org/licenses/by-nc-nd/3.0/ This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported license. The images in this article are included in the article's Creative Commons license, unless indicated otherwise in the image credit; if the image is not included under the Creative Commons license, users will need to obtain permission from the license holder in order to reproduce the image. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-nd/3.0/
spellingShingle Article
Evrard, Olivier
Chartin, Caroline
Onda, Yuichi
Lepage, Hugo
Cerdan, Olivier
Lefèvre, Irène
Ayrault, Sophie
Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title_full Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title_fullStr Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title_full_unstemmed Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title_short Renewed soil erosion and remobilisation of radioactive sediment in Fukushima coastal rivers after the 2013 typhoons
title_sort renewed soil erosion and remobilisation of radioactive sediment in fukushima coastal rivers after the 2013 typhoons
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3974138/
https://www.ncbi.nlm.nih.gov/pubmed/24694549
http://dx.doi.org/10.1038/srep04574
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