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Report No.
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Estimation of $$^{137}$$Cs discharge from river catchments using a tank model

Sakuma, Kazuyuki   ; Zheleznyak, M.*; Namba, Kenji*

To understand how much radiocesium discharge to a reservoir and the ocean through rivers from catchments is important for residents and municipal officials from immediately after Fukushima accident to the present. It is not easy to estimate $$^{137}$$Cs discharge from catchments based on observations because there are many processes such as continuous monitoring of water level and turbidity and $$^{137}$$Cs concentrations in river water to estimate $$^{137}$$Cs discharge fluxes. Therefore we developed a user-friendly model that is composed of tank model, which can predict water discharge easily, relationships between water discharge and suspended solids load, and two-component exponential models for $$^{137}$$Cs concentration in river water. Using developed model we estimated $$^{137}$$Cs discharge to the ocean from Abukuma River catchment and several rivers in coastal region from immediately after Fukushima accident to 2017.

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