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Behaviour of dissolved radiocesium within a Yokokawa dam reservoir basin (Research collaboration with JAEA and NIES)

Sakuma, Kazuyuki   ; Tsuji, Hideki*

We focus on a behavior of dissolved radiocesium within Yokokawa dam reservoir in Fukushima prefecture. (1) Horizontal distribution of dissolved $$^{137}$$Cs concentration in reservoir water, (2) $$^{137}$$Cs concentration of a plankton, (3) Investigation for sources of dissolved $$^{137}$$Cs from an upstream catchment of the dam reservoir, (4) Simulation for dissolved $$^{137}$$Cs discharge from the upstream catchment of the dam reservoir were studied. These indicated that dissolved $$^{137}$$Cs concentration in water at dam inlet and outlet were decreasing and an organic matter is one of the dissolved $$^{137}$$Cs source in forested catchment. Additionally we developed a numerical model to simulate dissolved $$^{137}$$Cs concentration at the catchment outlet, which reasonably reproduced a observation data under base flow periods.

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