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Report No.

Watershed-geochemical model to simulate dissolved and particulate $$^{137}$$Cs discharge from a forested catchment

Sakuma, Kazuyuki   ; Hayashi, Seiji*; Yoshimura, Kazuya  ; Kurikami, Hiroshi  ; Malins, A.  ; Funaki, Hironori ; Tsuji, Hideki*; Kobayashi, Takamaru*; Kitamura, Akihiro   ; Iijima, Kazuki  

We developed a watershed-geochemical model for simulating dissolved and particulate $$^{137}$$Cs discharges from a forest catchment in the upstream of the Ohta River. We connected a forest ecosystem compartment model to the 3-D watershed model GETFLOWS (GEneral-purpose Terrestrial Fluid-flow Simulator) to describe the dynamics of $$^{137}$$Cs between the forest ecosystem and the river system. The compartment model included sites for non-leachable and leachable $$^{137}$$Cs in the organic layer. The latter sites could model how stocks of leachable $$^{137}$$Cs increase with ambient temperature and consequently the rate of decomposition of organic matter. The simulation results for dissolved $$^{137}$$Cs concentrations in river water for the period 1 January 2014 to 31 December 2015 were in good agreement with measurements from the catchment. The simulations reproduced the dissolved $$^{137}$$Cs concentration peaks that occurred during three typhoon events and the seasonal variations under base flow conditions. The results support theories which suggest leaching from the organic layer in forests is a primary factor affecting dissolved $$^{137}$$Cs concentrations in river water under base and storm flow conditions.



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Category:Environmental Sciences



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