Grid-XAJ与Grid-GA模型在小流域洪水模拟中的适用性对比验证OA

[Objective]To construct flood forecasting models suitable for small watersheds where pumped-storage power sta-tions are located,improve flood forecasting accuracy,and provide a new forecasting approach for small watersheds with similar runoff generation and concentration characteristics.[Method]The watershed upstream of the lower reservoir dam site of Zhen'an Pumped Storage Power Station in Shaanxi Province was selected as the study area.Flood simulations were conducted using both the Grid-Xinanjiang(Grid-XAJ)model and the Grid-Green-Ampt(Grid-GA)model,and the simulation perform-ances under different flood scenarios were compared and analyzed.[Results](1)The Grid-XAJ model outperformed the Grid-GA model in flood simulation,with success rates of 74.36%and 80.94%,respectively,during the calibration and vali-dation periods,achieving Grade B forecasting accuracy.(2)The Grid-GA model produced better simulation results for the first flood following a prolonged drought than the Grid-XAJ model.(3)For annual maximum floods,the simulation accuracy of both models was comparable.The Grid-XAJ model performed better in hydrograph fitting,while the Grid-GA model was more effective in capturing peak discharge.[Conclusion]The Grid-XAJ model is more suitable for simulating regular floods in this watershed,whereas the Grid-GA model is better suited for forecasting the initial floods following drought periods.It is recommended to choose appropriate hydrological models based on antecedent soil moisture content for combined forecasting.This can provide an effective technical approach for flood forecasting in small watersheds with limited hydrological data.