The Simulation of Precipitation Based on RegCM3 in Haihe River Basin

For the impact of climate change and strong human activities, the amount and distribution of precipitation in Haihe river basin has changed greatly in recent years. The Regional Climate Model 3(RegCM3) is a useful model for simulating the atmosphere environment with physical and chemical mechanisms. In this article, the precipitation in Haihe river basin from 1991 to 2000 is simulated by the RegCM3. The results show that the tendency and amount of monthly precipitation can be simulated very well. But the simulations of peak values cannot reach a good accuracy. The applicability of this model for simulating the precipitation in different spatial scales and different terrains are compared. The simulation accuracy in the whole Haihe river basin is better than that in the third water resources zonings. It also indicates that the simulation in precipitation has a deep relationship with the terrain that the simulations in plain area behave much better than that in the mountain areas. As well as the simulation accuracy in different seasons is also analyzed.