THE SEDIMENT RESPONSES IN THE DOWNSTREAM BY SEDIMENT FLUSHING OF THE RESERVOIRS

Abstract

In order to alleviate negative influences on the downstream environment of the dam due to the reservoir sedimentation, the measures such as sediment flushing and sediment relocation have been adopted to supply sediment to the downstream channel. It is very important to understand the responses of the downstream channel to the sediment supply by the above measures. In this paper, the responses of sediment discharge by sediment flushing of the Dashidaira and Unazuki reservoirs on the downstream channel were studied by means of one dimensional numerical model of bed variation. The responses of the downstream physical environment to the sediment flushing of these reservoirs are analyzed further to acquire useful information on the sediment management.