Abstract
In order to plan and execute countermeasures for sedimentation problem in an actual dam, it is necessary to make prediction of reservoir sedimentation under the condition of various kinds of countermeasures. A numerical simulation is a useful tool for the prediction. However, for the purpose of getting highly accurate prediction, estimation of the sediment discharge into dam-reservoir is also important. In this paper, we propose an estimation method of non-uniform sediment discharge using actual results of dam reservoir sedimentation. The method includes developing a calculation technique for trap efficiency of fine sediment and systematizing estimation processes of field surveys and data analysis. The validity of this method is confirmed through the case of Sabaishigawa Dam in Nigata Prefecture.
