密度流排出を用いた黒部川連携排砂の高度化に関する研究

抄録

In the Kurobe River, coordinated sediment flushing and sluicing of Dashidaira and Unazuki dams have been executed since 2001. In order to minimize environmental impacts caused by intensive high sediment concentration discharge during sediment flushing, it is important to pass through fine sediments during each natural flood as much as possible.

This paper discusses effects of density current venting to discharge incoming fine sediment under various combinations of discharge facilities and reservoir water levels without fully drawdown. From the two dimensional reservoir model calculations, the lower reservoir water level and the combination of sediment flushing gate and the middle level outlet is recommended to sluice sediment without fully draw down.