Parameter sensitivity analysis of sewage irrigation infiltration process in sandy clay with HYDRUS-1D simulation

Abstract

The HYDRUS-1D model is used to analyze the sensitivity of various soil hydraulic parameters under constant head infiltration conditions. The results show that: under constant head infiltration conditions, the perturbation of each parameter is sensitive to the impact of soil water potential, the order is: n>?s>Ks>a>?r, where n is a parameter which has a greater impact on the simulation results of soil water potential. The sensitivity order of the influence of each parameter on the cumulative infiltration is: Ks>n>?s>?r>a, where Ks and n are the parameters that have greater impacts on the cumulative infiltration. Under the constant water head infiltration condition of sewage irrigation, simulation analysis should calibrate the accuracy of n, Ks and ?s parameters.