Abstract
Since controlling the sediment inflow to Three Gorges Dam reservoir is indispensable to managing its performances and water environments, we proposed a sediment routing model by reconstructing original version of comprehensive watershed management program Hydrological Simulation Program-FORTRAN (HSPF). For the purpose of increasing physical background of erosion model, the sub-model of erosion model along watershed slope was replaced, and the riverbank erosion model was added to original HSPF. We applied the sediment routing model to the Jianlinjiang river basin upstream of the Changjiang river, 1987. Though the model could not explain the violent variation of daily sediment load, it could simulate the mild variation of monthly sediment load. The calculated results indicated that in order to improve accuracy of model outputs we have to develop a down-scaling method of daily runoff to 1-hour runoff with particular reference of climate zone, geophysical features, seasonal characteristics of precipitation and so on.
