Cargando…

Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo

Radioactive caesium- 137 ((137)Cs) can be used as a tracer to infer sediment dynamics due not only to its long radioactive half-life but also its affinity for fine sediment. A novel advanced interpolation assessment was conducted to examine radionuclide activity in terraced land covered with volcani...

Descripción completa

Detalles Bibliográficos
Autor principal: Mouri, Goro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293220/
https://www.ncbi.nlm.nih.gov/pubmed/32533055
http://dx.doi.org/10.1038/s41598-020-65700-y
_version_ 1783546254576320512
author Mouri, Goro
author_facet Mouri, Goro
author_sort Mouri, Goro
collection PubMed
description Radioactive caesium- 137 ((137)Cs) can be used as a tracer to infer sediment dynamics due not only to its long radioactive half-life but also its affinity for fine sediment. A novel advanced interpolation assessment was conducted to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan, which had a time-dependent input function and incorporated the effects of mixed-sediment particle dynamic behaviour on radioactive decay. In addition, transport parameters derived from Chernobyl measurements were applied as predictors of the long-term contamination of the cardinal urban rivers by the fallout from the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in 2011. The behaviour of suspended sediment substances, incorporating the effects of deposition and pickup, was assessed using a mixed-sediment particle dynamics model. The concentrations of (137)Cs adsorbed on fine sediment particles of each size fraction were determined. Removal of (137)Cs from the cardinal urban river channel had significant effects on both long-term decline, including extreme flash flood events, and the dynamic and time-dependent behaviours of interspersed (137)Cs and sediment activity. A novel advanced interpolation assessment method was used to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan. The assessment procedure has a time-dependent input function and incorporates the effects of mixed-sediment particle dynamics on this time dependence. The results indicated that sediment and (137)Cs concentrations could decline more rapidly than observed in the Fukushima and Chernobyl regions. This rate of decrease depended on terraces covered with volcanic ash soil, which incorporated the effects of fine sediment behaviour for particle adsorption. In addition, comparatively large impacts were observed during extreme flash flooding events, which were associated with the land cover of the major urban river catchments in Tokyo. This work provides a new perspective for understanding (137)Cs behaviour associated with reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo, incorporating the effects of baseline (137)Cs behaviour with the impact of sediment particle adsorption in a volcanic ash soil-covered terrace.
format Online
Article
Text
id pubmed-7293220
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher Nature Publishing Group UK
record_format MEDLINE/PubMed
spelling pubmed-72932202020-06-15 Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo Mouri, Goro Sci Rep Article Radioactive caesium- 137 ((137)Cs) can be used as a tracer to infer sediment dynamics due not only to its long radioactive half-life but also its affinity for fine sediment. A novel advanced interpolation assessment was conducted to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan, which had a time-dependent input function and incorporated the effects of mixed-sediment particle dynamic behaviour on radioactive decay. In addition, transport parameters derived from Chernobyl measurements were applied as predictors of the long-term contamination of the cardinal urban rivers by the fallout from the Tokyo Electric Power Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in 2011. The behaviour of suspended sediment substances, incorporating the effects of deposition and pickup, was assessed using a mixed-sediment particle dynamics model. The concentrations of (137)Cs adsorbed on fine sediment particles of each size fraction were determined. Removal of (137)Cs from the cardinal urban river channel had significant effects on both long-term decline, including extreme flash flood events, and the dynamic and time-dependent behaviours of interspersed (137)Cs and sediment activity. A novel advanced interpolation assessment method was used to examine radionuclide activity in terraced land covered with volcanic ash soil in Tokyo, Japan. The assessment procedure has a time-dependent input function and incorporates the effects of mixed-sediment particle dynamics on this time dependence. The results indicated that sediment and (137)Cs concentrations could decline more rapidly than observed in the Fukushima and Chernobyl regions. This rate of decrease depended on terraces covered with volcanic ash soil, which incorporated the effects of fine sediment behaviour for particle adsorption. In addition, comparatively large impacts were observed during extreme flash flooding events, which were associated with the land cover of the major urban river catchments in Tokyo. This work provides a new perspective for understanding (137)Cs behaviour associated with reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo, incorporating the effects of baseline (137)Cs behaviour with the impact of sediment particle adsorption in a volcanic ash soil-covered terrace. Nature Publishing Group UK 2020-06-12 /pmc/articles/PMC7293220/ /pubmed/32533055 http://dx.doi.org/10.1038/s41598-020-65700-y Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Mouri, Goro
Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title_full Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title_fullStr Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title_full_unstemmed Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title_short Reproduction of sediment deposition and prediction of (137)Cs concentration in the major urban rivers of Tokyo
title_sort reproduction of sediment deposition and prediction of (137)cs concentration in the major urban rivers of tokyo
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7293220/
https://www.ncbi.nlm.nih.gov/pubmed/32533055
http://dx.doi.org/10.1038/s41598-020-65700-y
work_keys_str_mv AT mourigoro reproductionofsedimentdepositionandpredictionof137csconcentrationinthemajorurbanriversoftokyo