中文摘要：

Philip入渗模型与Green．Ampt入渗模型具有相似的物理基础。为间接推求Green-Ampt模型参数，对2种入渗模型进行了对比分析。建立了2模型参数间的数值关系。经理论推导发现，Green—Ampt模型中表征饱和导水率取值介于Philip模型参数稳渗率的1～1．5倍之间，为简化计算，取1．25倍关系，在此基础上，改进了Green—Ampt模型中湿润锋面吸力的求解式。利用数值模拟结果和文献资料进行验证，并对其适用性进行评价。结果表明，所建模型方法计算的入渗率接近模拟值或实测值，且适用于不同土质，其相对误差均小于5％，最大仅为3．61％，均方根误差最大为0．049。说明本文所建模型具有一定的可靠性和普适性，可利用Philip模型参数求解Green．Ampt模型参数，进而描述入渗问题。

英文摘要：

Philip infiltration model and Green-Ampt infiltration model have similar physical basis. In order to in- directly derive parameters of Green-Ampt model, the theoretical relationship among the Philip infiltration model and Green-Ampt infiltration model was analyzed, and the numerical relationship between the parameters of the Philip infiltration model and Green-Ampt infiltration model was established. After theoretical analysis, it was found that the characterization of saturated hydraulic conductivity in the Green-Ampt infiltration model was be- tween 1 to 1.5 times of steady infiltration rate of the Philip model. To simplify the calculation, the average value was gained and considered as the characterization of saturated hydraulic conductivity was equal to 1.25 times of the steady infiltration rate. On this basis, the expression of wetting front matric suction in Green-Ampt model was improved. The numerical simulation results and the literature were used to verify and evaluate its applicability. The results showed that the calculated infiltration rate was close to the simulated or measured values, and could be applied to different soil conditions, the relative error was less than 5% and the maximum value was only 3.61%. The maximum value of root mean square error was 0.049. The new model had a certain reliability and uni- versality, and could be used to solve the parameters of Green-Ampt model, and then described the infiltration problem.