GIS-based Distributed Hydrological Computational System of Debris-flow Watershed

Based on Geographic Information System(GIS) technology and distributed hydrological model,a computational system of debris-flow watershed is designed and implemented.With data such as rainfall,elevation and slope introduced,the system simulates rainfall-runoff and rainfall-sediment of the watershed to calculate runoff,sediment yield and sediment concentration automatically for each day.The system is applied to Jiangjia Valley,a debris-flow basin of Yunnan Province.Calculated result agrees well with the measured sediment concentration,which shows that the system has high reliability and applicability.