A Research and Application on Sensitivity Analysis, Calibration of Distributed Hydrological and Erosion Prediciton Model at Small Watershed Scale in the Loess Hilly-Gully Region

摘要

Uncertainty analysis was first conducted on the parameters of the established hydrological and erosion model in the small watershed of loess hilly region in this study.On this basis, the initial water content, saturated water content, saturated hydraulic conductivity, suction parameter and critical shear stress of soil were taken as the model calibration parameters.Additionally, artificial calibration method and genetic algorithm method were used for parameter calibration and sensitivity analysis of the watershed, and a brief comparison was carried out with the calculated results of artificial calibration.By combining validity tests of NashSutcliffe model, it was proven that the accuracy of parameter optimization was relatively high by using genetic algorithm, and this algorithm can be analogized to parameter optimization of other hydrological and erosion models.