利用Hydrus-1D反推土壤水力参数方法分析

Inverse Solution Soil Hydraulic Parameters and Verification Using Hydrus-1D Model

预测分析非饱和土壤水分运动特征必须首先获得土壤水力参数,而且土壤水力参数的准确性决定着与这些参数有关的土壤水分运动的数值模型的准确性。本文依据一维积水入渗试验的累积入渗量资料利用Hydrus-1D软件反推土壤水力特性参数,利用反推的土壤水力特性参数和Hydrus-1D软件对一维积水入渗过程的累积入渗量、入渗率、湿润深度、含水量分布进行模拟并与实测值进行对比,结果显示,土壤累积入渗量、入渗率、湿润锋、含水量分布的实测数据与模拟数据之间的平均相对误差均在2%～15%之间,软件模拟数据与试验实测数据基本吻合,这说明利用Hydrus-1D软件在反推土壤水力特性参数及模拟土壤水分运动方面是可行的。

Solving unsaturated soil water movement equation and forecast analysis characteristics of unsaturated soil water movement must firstly obtain soil hydraulic parameters, and that deterministic of soil hydraulic parameters determine deterministic of soil hydraulic parameters on mathematical mode] with theses parameters. InI this paper, According to cumulative infiltration capacity of one-dlmensional vertical pondiug infiltration inverse solution soil hydraulic parameters using Hydrus-1 D Model, then using inverse solution soil hydraulic parameters and Hydrus-I D Model to cumulative infiltration capacity, the rate of infiltration, wetted depth, water content distribution of one-dimensional verti- cal ponding infiltration simulation and contrast on measured values. The result shows ,the average relative error of the measured values of cumulative infiltration capacity of soil, the rate of infiltration, wetted depth, water content distribution and value of simulation is in the range of 2% ～ 15% ,then values of simulation agree well with the experimental data. This show,inverse solution soil hydraulic parameters and simulation soil water movement using Hydrus-I D Model is practicable.