Hydrologic Model Application Based on Automatic Calibration with PEST

Water shortage and pollution are becoming more serious for population explosion and rapid economic growth. Hydrologic models, essential to watershed planning and management, can represent the complex hydrological phenomenon and is an effective tool to simulate hydrological process. This paper mainly discusses the theory of HSPF and automatic calibration with PEST. Analysis shows that HSPF is an effective tool to simulate hydrological process and PEST could calibrate the parameters quickly and efficiently and play a crucial role in hydrological simulation of HSPF. Finally this paper summarizes the factors that influence simulation result and provides some suggestions for future research.