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タンクモデルを用いた福島事故初期の河川流域からの$$^{137}$$Cs流出量の推定

Estimation of $$^{137}$$Cs discharge from river catchments during initial period after Fukushima accident using a tank model

佐久間 一幸   ; Zheleznyak, M.*; 難波 謙二*

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

流域に沈着した$$^{137}$$Cs流出量の把握を目的として、河川流量をタンクモデル、土砂流出を河川流量-土砂流出量関係式、$$^{137}$$Cs濃度は2成分減衰モデルを用いて表現した簡易モデルを構築した。阿武隈川流域および福島県浜通り2級河川を対象に、福島事故初期における河川を通じた$$^{137}$$Cs流出の推定を行った。

We developed a simple model that is composed of tank model, relationships between water discharge and suspended solids load, and two-component exponential model for $$^{137}$$Cs concentration in river water to estimate $$^{137}$$Cs discharge from river catchments. We applied this model to Abukuma River and several rivers in coastal region in Fukushima to estimate $$^{137}$$Cs discharge from these catchments through rivers during initial period after Fukushima accident.

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