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

森林流域から流出する溶存態及び懸濁態$$^{137}$$Csをシミュレートするための流域・地球化学モデル

佐久間 一幸   ; 林 誠二*; 吉村 和也  ; 操上 広志  ; Malins, A.  ; 舟木 泰智 ; 辻 英樹*; 小林 嵩丸*; 北村 哲浩   ; 飯島 和毅  

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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パーセンタイル:34.88

分野:Environmental Sciences

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