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Temporal variability of $$^{137}$$Cs concentrations in coastal sediments off Fukushima

鈴木 翔太郎*; 天野 洋典*; 榎本 昌宏*; 松本 陽*; 守岡 良晃*; 佐久間 一幸  ; 鶴田 忠彦 ; 帰山 秀樹*; 三浦 輝*; 津旨 大輔*; 神山 享一*; 和田 敏裕*; 高田 兵衛*

Suzuki, Shotaro*; Amano, Yosuke*; Enomoto, Masahiro*; Matsumoto, Akira*; Morioka, Yoshiaki*; Sakuma, Kazuyuki; Tsuruta, Tadahiko; Kaeriyama, Hideki*; Miura, Hikaru*; Tsumune, Daisuke*; Kamiyama, Kyoichi*; Wada, Toshihiro*; Takata, Hyoe*

The monthly monitoring data (total 3647 samples) between May. 2011 and Mar. 2020 were analyzed to describe temporal variability of $$^{137}$$Cs concentration in coastal sediments off Fukushima. $$^{137}$$Cs concentration of sediment had decreasing trend, but non-linear model fitting suggested that this decreasing trend showed slower. Additionally, $$^{137}$$Cs concentration were up to 4.08 times greater in shallow sampling sites (7, 10, 20 m depth) following heavy rainfall events (before five months vs. after five months), such as typhoons. These were consistent with increasing particulate $$^{137}$$Cs (P-$$^{137}$$Cs) fluxes from river and increasing dissolved $$^{137}$$Cs (D-$$^{137}$$Cs) concentration in seawater. Finally, the numerical experiment was conducted and revealed that riverine $$^{137}$$Cs input could preserve $$^{137}$$Cs concentration in coastal sediment. These results indicate that riverine $$^{137}$$Cs input via heavy rainfall events is one of the main factors for preserving $$^{137}$$Cs concentration in coastal sediment off Fukushima.

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