細粒土砂堆積による高水敷形成現象を1次元河床変動計算に組み込んだ河積変化予測手法

抄録

We found that riparian deposits of fine sediment originating from wash load material to cause forming high-water channel and channel narrowing frequently observed in natural-levee reaches can be classified into "longitudinally advection type" and "lateral diffusion type". By incorporating an essential feature of sediment transport for each type into a conventional 1-D calculation of river-bed variation while retaining its simplicity, we developed a practical method of estimating the change in the longitudinal profile of flood flow capacity due to both river-bed variation and width reduction of a low-water channel. The method well reproduced geomorphic changes observed in the Sendai River, though several problems to be solved for improving the prediction accuracy were acquired.