半干旱半湿润地区新安江模型应用探讨

aking Fuping Basin as an example, this paper analyses the flood characteristics in semi-arid and semi-humid regions, and studies the application of xin'anjiang model as well as related improved models in such basins. The results show that improving runoff module of xin'anjiang model has little effect on prediction results, confluence module is the key module to prediction accuracy and Cs is the key parameter. Through formula deduction and data analysis, the paper discusses why Cs is very sensitive and holds that it can control the discharge change at basin outlet every moment, thereby determing the shape of forecast hydrograph. Finally, the paper puts forward some tentative ideas on the parameter Cs.