流域スケールでの流出流木量の推計モデルの構築

抄録

We constructed woody debris transport model at catchment scale consisted of the rainfall-induced shallow landslide model for the woody debris recruitment and the two-stage tank model for the woody debris entrainment for 5 dam reservoirs watershed (Gosho, Shijushida, Tase, Yuda, Ishibuchi) at the Kitakami-river watershed. The Nash-Sutcliffe values were 0.7 or more for woody debris estimated using this model except the Shijusida dam reservoir. From the ratio of outflow and storage, it was inferred that Yuda and Gosyo were watersheds where woody debris is easy to store. On the other hand, Ishibuchi and Gosyo showed the opposite trend.