Abstract
With the increase of the completed dams in recent years, we have become getting enough data of sedimentation in reservoirs to analyze hydrological and hydraulic features of the sedimentation variously. Through the investigation of sedimentation in reservoirs for water power generation, the authors discuss the annual variations of sedimentation and the sedimentation rates, relating to various factors of drainage basins and reservoirs . There are several different types in sediment accumulation changes, which seem relating to backsand upstream of reservoirs. Thus we select the factors of drainage basins and reservoirs relating to the types, considering the analogy from delta and fan on the formation of backsand. Moreover we indicate the specific sediment accumulation have to be estimated according to the type. As the result of the analysis for the relating factors, it is indicated that consideration of the multivariables are required in this analysis. We discuss the results of the analyses using quantification of qualitative data.
