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Evaluation of particulate $$^{137}$$Cs discharge from a mountainous forested catchment using reservoir sediments and sinking particles

Funaki, Hironori ; Yoshimura, Kazuya ; Sakuma, Kazuyuki  ; Iri, Shatei; Oda, Yoshihiro 

The time and size dependencies of particulate $$^{137}$$Cs concentrations in a reservoir were investigated to evaluate the dynamics of $$^{137}$$Cs pollution from a mountainous forested catchment. Sediment and sinking particle samples were collected using a vibracorer and a sediment trap at the Ogaki Dam Reservoir in Fukushima, which is located in the heavily contaminated area that formed as a result of the Fukushima Dai-ichi Nuclear Power Plant accident of 2011. The particulate $$^{137}$$Cs concentration showed a decline with time, but the exponent value between the specific surface area and the $$^{137}$$Cs concentration for the fine-sized particle fraction remained almost constant from the immediate aftermath of the accident. These quantitative findings obtained by reconstructing the contamination history of particulate $$^{137}$$Cs in reservoir sediments and sinking particles have important implications for the evaluation of $$^{137}$$Cs dynamics in mountainous forested catchments.

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Category:Environmental Sciences

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