EVALUATION OF SEDIMENT REPLENISHMENT IN A HYDROPOWER DAM AND CHALLENGES FOR SUSTAINABILITY

Abstract

 Reservoir sedimentation is one of the most important problems for sustainable management of hydropower dams. Because of sedimentation in dams, little volume of the sediment flows at the downstream. Among several countermeasures, sediment replenishment is an effective option which can be environmental friendly at the downstream. In this paper, we considered the sediment replenishment of total approximately 680,000 m³ in 20 years. In the dam downstream environment, the changes of cross section, bed material size, algal biomass and benthic macroinvertebrates were shown the possibility of the effect of sediment replenishment. We found the potential of its increase in quantity of sediment replenishment.