人工的土砂供給に伴う下流河川の物理環境応答特性

抄録

Recently, in order to improve the deteriorated river environment, the artificial sediment supply such as sediment placement at the downstream of dams or flushing of sediment has been implemented. However, it is not still clear about positive and negative effects of the artificial sediment supply on the downstream ecological system and physical environment. Study on these effects is one of important subjects for the sediment and river management. This study focuses to the response characteristics of the downstream physical environment by supplying artificial sediment. Characteristics of changes of bed level, sediment transport and changes of sediment diameter are clarified using one dimensional numerical model of bed variation and the response characteristics of physical environment by supplying artificial sediment are discussed.