Influence of infiltration heads on parameters of Philip model of vertical one-dimensional infiltration

Based on unsaturated soil moisture movement theory,the mathematical model of one-dimensional vertical infiltration was established and the simulation of infiltration characteristics of various typical soils with different infiltration heads was performed.The simulation result was fitted by Philip model and showed that the infiltration head would have some effect on infiltro-sorptivity and steady infiltration rate.A method for determining the parameters of Philip model such as infiltration heads and saturated hydraulic conductivity was presented.The established model was verified by the literatures and data available.It was shown that the established model was able to determine readily the infiltro-sorptivity and steady infiltration rate and reflect more accurately the characteristics of one-dimensional vertical infiltration of soil moisture.