Parameter estimation and application of grid-based Xin'anjiang model

Based on the theory of the Xin'anjiang model and one-dimensional diffusion wave model,the grid-based Xin'anjiang model(the Grid-Xin'anjiang model) was developed.This model regarded the grid DEM as the computational element,and the generated runoff of each element was divided into three components,the surface runoff,interflow,and groundwater runoff,which were routed using the cell-to-cell diffusion wave flow routing method according to the computational order of each grid cell in the DEM.During the calculation of the runoff generation and runoff concentration,the water exchange between grids and the influence of the river drainage network were taken into consideration.Based on the underlying surface conditions,including the topography,and the types of soil and vegetation in the study basin,a method for parameter estimation of the model was proposed and verified.The model was applied to the Tunxi Basin in Anhui Province for flood simulation and produced favorable results.