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.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
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)
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
vertical one-dimensional soil infiltration
VG model
single-factor perturbation analysis
parameter sensitivity analysis
