GIS/RS based distributed hydrological modeling 1, model theories and structures

A geography information system(GIS)/remote system(RS)distributed hydrological model is presented for water resources management of watershed. The model includes a unit hydrological module and a routing module. The former concerns with hydrological processes such as canopy interception,snowmelt,evapotranspiration,slope flow,soil flow and ground flow. The topography index method taking into consideration the effects of topography is used to calculate water yield.For river network routing,the Muskingum method is usually used. The inputs and parameters of the model are prepared with the support of GIS and RS,which enhance the efficiency of hydrological modeling.