STREAMFLOW SIMULATIONS WITH HYDROLOGIC MODEL SYSTEM IN THE EMEI WATERSHED, CHINA

The purpose of this study is to simulate the hydrologic response to four single-storm events with a distributed hydrologic model system (HMS) in the Emei watershed (8.44 km2), China and to provide information for the study on the interactions between regional climate and hydrologic system in the upper Yangtze River. HMS was designed to study hydrologic processes and systems responding to various climatic forcings and focuses on the interactions among climate, land surface, surface water, and ground water. The SCS Curve Number and Green-Ampt methods of rainfall-runoff partitioning were used in HMS. The data sets such as digital elevation model (DEM), soil, land use and land cover and hydrologic parameters were processed on Geographic Information System (GIS) for this study. Precipitation data were collected from six rainfall stations within the watershed and processed rainfall data during storm events were used to drive the HMS. The HMS was calibrated to the observed data in the watershed. The simulation using different time interval in precipitation was run to examine the effects of temporal scale in precipitation on the hydrologic response. The simulation results indicate that the temporal variations in precipitation have significant impacts on the simulated streamflow hydrograph.