流量変化に伴う河床波の応答に関する研究

Abstract

In the case that the hydraulic condition has varied before the sand dunes reach the equilibriumstate, there may be some phase lag between the variation of discharge and the transformation of thedunes. In the region that dunes develop as dicharge increase, the dunes in the rising stage of floodare smaller than that of falling stage for a same discharge. As the result, some loop may be foundin a water depth-discharge graph. These phenomena are investigated by the experiment. Theauthors also present a theory for dune transformation under steady and unsteady conditions.This theory was verified by the authors' experiments.