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- W4207028135 abstract "This study presents the temporal variations in riverine 137Cs concentrations and fluxes to the ocean during high-flow events in three coastal river catchments contaminated by the Fukushima Daiichi Nuclear Power Plant accident. River water samples were collected at points downstream in the Niida, Ukedo, and Takase Rivers during three high-flow events that occurred in 2019-2020. Variations in both the dissolved and particulate 137Cs concentrations appeared to reflect the spatial pattern of the 137Cs inventory in the catchments, rather than variations in physico-chemical properties of water and suspended solid. Negative relationships between the 137Cs concentration and δ15N in suspended solid were found in all rivers during the intense rainfall events, suggesting an increased contribution of sediment from forested areas to the elevation of particulate 137Cs concentration. The 137Cs flux ranged from 0.33 to 19 GBq, depending on the rainfall erosivity. The particulate 137Cs fluxes from the Ukedo River were relatively low compared with the other two rivers and were attributed to the effect of the Ogaki Dam reservoir upstream. The percentage of 137Cs desorbed in seawater relative to 137Cs in suspended solids ranged from 2.8% to 6.6% and tended to be higher with a higher fraction of exchangeable 137Cs. The estimated potential release of 137Cs desorbed from suspended solids to the ocean was 0.022-0.57 GBq, and its ratio to the direct flux of dissolved 137Cs was 0.12-6.2. Episodic sampling during high-flow events demonstrated that the particulate 137Cs flux depends on catchment characteristics and controls 137Cs transfer to the ocean." @default.
- W4207028135 created "2022-01-26" @default.
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- W4207028135 date "2022-05-01" @default.
- W4207028135 modified "2023-10-04" @default.
- W4207028135 title "A comparative study of riverine 137Cs dynamics during high-flow events at three contaminated river catchments in Fukushima" @default.
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- W4207028135 doi "https://doi.org/10.1016/j.scitotenv.2022.153408" @default.
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