Abstract
This paper presents the results of the study on a new synthetic model which can be used for predicting state of sedimentation in a whole mountainous river system. First, a new model of sedimentation using the pseudo channel network obtained from DEM (Digital Elevation Model) is proposed in order to take distibutions of slopes and hydrological conditions in a river basin into account. Next, the new model is applied to the small basin, Haruki River basin (21km2), then capabilities of the model for extending to more large and complex river basins are discussed. Finally, the new model is improved for applying to the whole Hayakawa River system (509km2) considering the spatial distrubution of rainfall, effects of Sabo dams and so on. The results of the simulation of river bed variation show that potential of the new model is very high.
