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Sensitivity analysis of VG model parameters with vertical one-dimensional soil infiltration
Author(s): WANG Zhitao, JIAO Xiyun, HAN Hongliang, YU Xiaobin
Pages: 80-
84
Year: 2013
Issue:
1
Journal: Journal of Hohai University(Natural Sciences)
Keyword: 垂直一维入渗; VG模型; 单因素扰动分析方法; 参数敏感性分析;
Abstract: 基于HYDRUS-1D模型,采用单因素扰动分析方法对VG模型的残余含水率θr、饱和含水率θ5、经验参数n和α、饱和导水率Ks共5个参数进行敏感性分析.结果表明:n,θs,Ks的扰动对垂直湿润距离计算值Rz、累计入渗量计算值Ⅰ的影响较大,α的扰动影响次之,θr的扰动影响最小;n的负扰动对Rz和Ⅰ的影响最大,且n较小时给模拟结果带来的误差较大.因此,在模拟计算中应保证VG模型参数n,θs,Ks等的精度.
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