2021 Fiscal Year Final Research Report
Long-term dynamics of radiocesium in aquatic ecosystems of Fukushima and Chernobyl contaminated areas
| Project/Area Number |
18H03389
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 64010:Environmental load and risk assessment-related
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| Research Institution | Fukushima University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
高瀬 つぎ子 福島大学, 共生システム理工学類, 特任准教授 (10466641)
脇山 義史 福島大学, 環境放射能研究所, 准教授 (40594792)
塚田 祥文 福島大学, 環境放射能研究所, 教授 (50715498)
RAHMAN Ismail 福島大学, 環境放射能研究所, 准教授 (60773067)
高橋 隆行 福島大学, 共生システム理工学類, 教授 (70197151)
難波 謙二 福島大学, 共生システム理工学類, 教授 (70242162)
和田 敏裕 福島大学, 環境放射能研究所, 准教授 (90505562)
Zheleznyak Mark 福島大学, 環境放射能研究所, 特任教授 (90745712)
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| Project Period (FY) |
2018-04-01 – 2021-03-31
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| Keywords | Fukushima / Chernobyl / environment / contamination / radiocesium / fate and transport / rivers / lakes |
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| Outline of Final Research Achievements |
The peculiarities in climate, geomorphology and radiocesium (r-Cs) speciation in the fallout were demonstrated to lead to differences in migration rates of r-Cs in the environment and rates of its natural attenuation. The climate conditions for the Fukushima Prefecture of Japan are characterized by higher annual precipitation as compared with Chernobyl with maximum rainstorm events during typhoon season. Typhoons Hagibis in 2019 demonstrated the substantial redistribution of r-Cs on river watersheds and floodplains and in
some cases natural self-decontamination occurred. Steep slopes of Fukushima catchments are conducive to higher erosion and higher particulate r-Cs wash-off. A semi-empiric diffusional model for radionuclide long-term dynamics in rivers and lakes was further developed and validated using the Fukushima and Chernobyl datasets. A methodology for reconstruction of radionuclide long-term dynamics in rivers and lakes was proposed and applied for bottom sediment cores.
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| Free Research Field |
Dynamics of environmental radioactivity
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| Academic Significance and Societal Importance of the Research Achievements |
The project provided assessment of the current state and prediction of r-Cs long-term dynamics in aquatic ecosystems of the Fukushima contaminated areas. Data obtained can be used by decision makers. Results were disseminated through mass media and meetings with people in Fukushima Prefecture.
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