流れによる砂防堰堤からの流出土砂量の評価に関する基礎的研究

抄録

One reason of sediment-flood disasters is that the amount of sediment supplied from sabo dams exceeds the amount of sediment that can be transported by water flow. Therefore, it is necessary to evaluate the sediment discharge from over the sabo dam with the water. The sediments in the sabo dams have a wide particle size distribution. The objective of this study is to clarify the amount of sediment discharged from a sabo dam through experiments and to develop a method of the prediction. In the experiment on the sediment discharge from the sabo dam using mixed particle size, sediment discharge from the sabo dam was more than 20 times greater than the erosion volume. The Eulerian deposition model that can evaluate the porosity was extended to the erosion process, was coupled with sediment transport models. The present method captured the sorting process of the riverbed and reproduced variations in volume and the sediment size distribution simulating the porosity of sediment.