非饱和土体降雨入渗的全过程数值模拟

Numerical Simulation of Overall Process of Rainfall Infiltration in Unsaturated Soil

采用Crank-Nicolson型差分格式建立了非饱和土降雨入渗的精细化数值模型,此模型对时间和空间均具有二阶精度。每个时间步长的计算采用迭代过程来提高计算精度,利用此计算模型对某一具体的降雨过程中土体含水量的变化进行了数值模拟计算。

A precise numerical model based on Crank-Nicolson difference scheme was proposed for calculating water distribution of unsaturated soil under rainfall infiltration. This model has two-order accuracy both in time and space, and by using iterative method in every time step, this model also has higher accuracy. An example of this model was given in this paper to simulate the distribution of water in unsaturated soil under a whole rainfall infiltration course.