不同入渗水头条件下土壤水分运动数值模拟

在分析入渗水头对土壤水分入渗影响的基础上,提出了分层计算假定,建立了不同入渗水头作用下土壤水分运动数学模型,并采用差分法进行求解.在室内进行了不同入渗水头土壤水分入渗验证试验,结果表明,模型计算土壤含水率与试验实测值具有较高一致性,最大相对误差为4.8％,表明所建立的不同入渗水头作用下土壤水分运动数学模型是正确的,求解方法是可行的.

Numerical Simulation for Soil Water Movement at Different Infiltration Heads

Based on the effect of infiltration head on soil water movement, the assumption of layered calculation was put forward. The model of soil water movement at different infiltration heads was established, and the finite difference method was used to solve it. A series of soil column infiltration experiments at different infiltration heads were conducted to verify the model. The computational soil water contents derived from the model was in accordance with the experimental results, the maximum relative error was 4.8%.It indicates that the mathematic model of soil water movement at different infiltration heads is correct and solving of the model with the finite difference method is feasible.