河床材料の空隙率および交換層厚変化を考慮した河床変動モデルの開発

抄録

Recently, to solve the sediment problems in dam reservoir and to carry out comprehensive sediment management, many sediment supply measures have been examined (sediment discharge, placed sediment method at the lower reach of a dam, etc.). In these circumstances, it is required to develop the decision method of the quantity and quality of sediment supply for suitable lower reach condition. Therefore, we paid attention to the river comprised of the wide grain size distribution river bed materials. In this paper, we conducted the large scale hydraulic experiments and developed the river bed variation model based on the knowledge of the hydraulic experiments. We also improved the model considering porosity and exchange layer variation of bed materials. As a result, we confirmed the role of each grain size in river bed variation and river bed configurations by the hydraulic experiments. Furthermore we confirmed the high reproducibility of the river bed variation model.