Flood Simulation and Parameter Optimization of Baimaguan Watershed
To improve the simulation accuracy of mountain floods,the distributed hydrological-hydraulic model(HH model)was used to simulate the rainfall-runoff process from 2017 to 2022 in the Baimaguan Watershed of Miyun District,Beijing.Choosing six typical field floods,multi-objective optimization algorithm ε-NSGA Ⅱ was adopted to optimize the key parameters of the HH model.The results indicate that the Nash coefficients of the rate floods ranged from 0.89 to 0.96,the errors of flood peak flow were within 20% ,the errors of flood volume were within 15% ,and the differences of peak and present time were within 1 hour;The Nash coefficients of the validation floods ranged from 0.81 to 0.92,the errors of flood peak flow were within 20% ,the errors of flood volume were within 10% ,and the differences of peak and present time were within 1 hour.After optimized the parameters of the HH model,the simulation effect of floods in the Baimaguan Watershed was good.Finally,the threshold range of the key parameters applicable to flood simulation in the Baimaguan Watershed was proposed,which provides a scientific theoretical basis for optimizing hydrological simulation parameters in local mountainous areas.
万方数据
维普
