中文摘要：

在蓄水坑灌灌水时,蓄水坑内入渗水头的增加会改变入渗界面土壤结构性状,从而导致土壤水分入渗特性发生变化。为了能够模拟不同入渗水头作用下的入渗过程,该文在分析入渗水头对水分入渗影响的机制基础上,将入渗水头对入渗的影响归结为对概化饱和区导水率的影响,建立了能够模拟不同入渗水头对入渗影响的改进Green-Ampt模型。在室内进行了不同入渗水头入渗试验对改进后的Green-Ampt模型进行验证,结果表明不同入渗水头条件下不同时刻对应入渗率的Green-Ampt模型计算值和试验实测值吻合较好,改进的Green-Ampt模型可以有效地模拟不同入渗水头条件下的入渗过程。

英文摘要：

During irrigation process,the soil structure of infiltration interface is changed with infiltration head increasing in water storage pit,which results in changing of soil water infiltration characteristics. In order to simulate the infiltration process of different infiltration heads,the improved Green-Ampt model of different infiltration heads was established based on mechanism of soil infiltration in different infiltration heads. Effect of infiltration head on infiltration was reflected by the generalized saturated hydraulic conductivity. A series of experiments were conducted to verify the improved Green-Ampt model of different infiltration heads. The computational infiltration rate derived from the improved Green-Ampt model was in accordance with the experimental results under different infiltration heads. They indicate that the improved Green-Ampt model can effectively simulates infiltration process of different infiltration heads.