The Study and Application of GIS-based distributed Hydrological Model

Based on the mules-angled underlaying surface information provided and generated by GIS, the authors took into account topology, vegetation and soil's effects in the developmental process of runoff and built a spatial distributed model of basin water storage capacity. On the base of these studies, IHMS-VSWSC(Integrated Hydrological Modeling System Based on Various Spatial Water Storage Capacity) was explored and developed to simulate basin rainfall runoff process, which simulated hydrologic processes including canopy interception, snow melt, evapotranspiration, runoff production and flow concentration. Lastly, this model was applied and verified in the hydrologic simulation of Laoha River Dianzi basin, China. An average NASH-Sutcliffe coefficient of 0.807 was achieved and it indicated that this hydrologic model was a good one, as well as the spatial distributed model of water storage capacity the authors built could describe relative spatial distribution of water storage capacity in cold and arid area.