土壤垂直一维入渗对VG模型参数的敏感性分析  

Sensitivity analysis of VG model parameters with vertical one-dimensional soil infiltration

作　　者：王志涛[1,2] 缴锡云[1,2] 韩红亮[1,2] 虞晓彬[1,2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学水利水电学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2013年第1期80-84,共5页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(50979025);引进国际先进水利科学技术项目(水利部"948"项目)(201230)

摘　　要：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θs、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。With the help of the HYDRUS-1D software,the single-factor perturbation analysis method was used for sensitivity analysis of five parameters,including the residual moisture content θr,the saturated moisture content θs,the empirical parameters n and α,and the saturated hydraulic conductivity Ks,in the van Genuchten（VG） model.The results show that the perturbation of n,θs,and Ks has a significant impact on calculated values of the wetting front migration distance（Rz） and the cumulative infiltration（I）,while the perturbation of α has less impact and the perturbation of θr has the least impact.The perturbation of n has the most significant impact on Rz and I,and a small value of n may cause great errors in simulation.Therefore,it is very important to accurately determine the parameters n,θs,and Ks to reduce the simulation errors during the soil moisture and solute transport simulation.

关 键 词：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 

分 类 号：S152.72[农业科学—土壤学]