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There are some studies of sediment runoff using volume of deposited sediment in large dams. However, quantitative evaluation of sediment runoff is not sufficient because the basin area is large and has various surface geologies. We paid attention to sabo dams. The basin area of sabo dam is small and has almost uniform surface geology. The analysis of its deposition sediment is suited to develop the characteristics of sediment runoff. In this study, we develop the prediction method of the volume of sediment runoff by deposited sediment volume of sabo dams and apply this method to Nagara River basin in Gifu Prefecture. As a result, we could evaluate the sediment runoff by using results of basic surveys under Sediment Disaster Prevention Act.

PREDICTION OF SEDIMENT RUNOFF FROM RESULTS OF BASIC SURVEYS UNDER SEDIMENT DISASTER PREVENTION ACT