考虑气压势影响的降雨入渗数值模拟研究

Numerical Simulation for Rainfall Infiltration with the Effect of Air Pressure

利用一维下渗模型的数值模拟方法研究下渗试验过程中气压势与饱和水力传导度K_s的关系。数值分析表明,可通过由下渗过程中表层湿润的饱和度来折减K_s值的途径考虑气压势的影响,从而改进计算方法。下渗试验的模拟计算结果表明,改进后的方法比常用的方法有更高的精度。

The relationship between saturated hydraulic conductivity K_s and air pressure within rainfall infiltration experiment is investigated by a numerical simu- lation based on a one-dimensional infiltration model. The numerical analysis indi- cats that the computation method may be improved by decrement of K_s with satura- tion at the soil surface in consideration of air pressure formed in rainfall infiltration. Finally, the computation results in simulation of infiltration experiments show that the improved method is more accurate than normal.