Simulation of reservoir sedimentation in mountain regions

If a catastrophic landslide occurs in mountain regions, the influence upon sediment transportation remains so great for a long time that the reservoir sedimentation will become a more serious problem. In such a case, the sediment discharge into the reservoir will change remarkably with erosion of the sediment deposited in the valleys. So, the way to determine the boundary condition on sediment discharge is discussed by using the field data in the case of “Ontake landslide (1984)”. Then a method to predict the reservoir sedimentation in one dimension is developed on the basis of consideration of the changes of the boundary condition on sediment discharge into the reservoir. This method is applied to the reservoir sedimentation in a field and its applicability is very good.