Abstract
In recent years, the importance of total sediment control from mountains to estuaries has been realized. Also, under greater consideration are reservoir sedimentation problems in river basins, as well as estimation of sediment discharge and its transportation properties. Observation of reservoir deposition provides useful input data for these estimations. An examination of this data, collected from reservoirs throughout Japan, is the focus of this paper. Based on the analysis of the relation between annual variations and other factors, this thesis identifies characteristics of sediment deposition and yield properties from watersheds. This research concludes that there are three general types of annual variations of sediment deposition. These types are originated by variation of sediment yield in mountain areas and are possibly related to backsand accumulation at the upstream of reservoirs.
