山地河川における土砂流出の数値計算

Abstract

In this paper, a new numerical simulation model is proposed, which can predict the sediment runoff from a mountain watershed. In the model, the watershed is composed of some units of slopes and a network of stream channels. The runoff process from each slope unit is calculated by the kinematic wave method. The process of water runoff in the channel network is calculated by one dimensional simulation model using the water discharges from the slopes. The bed variation and sediment discharge in each stream channel can be predicted by a bed-load formula. The bank erosion is considered as the main cause of the sediment supply.