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Contribution of particulate $$^{137}$$Cs from rivers to $$^{137}$$Cs concentrations in coastal sediment off Fukushima

Suzuki, Shotaro*; Sakuma, Kazuyuki   ; Tsuruta, Tadahiko  ; Matsumoto, Akira*; Amano, Yosuke*; Enomoto, Masahiro*; Morioka, Yoshiaki*; Kamiyama, Kyoichi*; Takata, Hyoe*

To evaluate contribution of riverine particulate $$^{137}$$Cs input, we estimated $$^{137}$$Cs concentration coastal sediment (7-20 m depth) with particulate $$^{137}$$Cs flux of the total 13 rivers (Uda, Mano, Niida, Ohta, Odaka, Ukedo(+Takase), Maeda, Kuma, Tomioka, Ide, Kido, Natsui, Same) calculated by tank model for water discharge and empirical equations for suspended solids fluxes and $$^{137}$$Cs discharge between May 2011 and March 2020. Calculated particulate $$^{137}$$Cs flux from the river were ranged from 2.11$${times}$$10$$^{9}$$ to 4979$${times}$$10$$^{9}$$ Bq/month. Estimated $$^{137}$$Cs concentration including particulate $$^{137}$$Cs via deposition kept concentration level more than minimum 0.351 Bq/kg-dry when initial $$^{137}$$Cs concentration, variation rate and deposition ratio were set 300 Bq/kg-dry, -95% and 0.1, respectively.

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