基于Matlab方法确定VG模型参数  

Determination of the parameters of VG model based on Matlab

作　　者：彭建平[1] 邵爱军[1] 

机构地区：[1]石家庄经济学院,石家庄050031

出　　处：《水文地质工程地质》2006年第6期25-28,共4页Hydrogeology & Engineering Geology

基　　金：河北省自然科学基金(D2004000480);河北省博士基金(B2002218)

摘　　要：根据中国科学院栾城试验站大田土壤剖面所采土样实测土壤负压h和土壤含水率θ实验数据,采用van Genuchten模型来描述土壤水分特征曲线(h-θ曲线),VG模型中的参数利用Matlab非线性拟合函数来确定,通过对四参数模型和三参数模型的比较表明,四参数模型拟合的参数与三参数模型中的参数非常接近,但四参数模型能够更好地拟合实测数据,误差比三参数模型相对较小。且计算值与实测值的残差平方和范数小于0.07%,拟合较好。Based on the observation data of soil negative pressure h and soil water content θ obtained at the Luancheng Agricultural Ecosystem Station of Chinese Academy of Sciences, soil-water characteristic curve （h-θ carve）are described by using the van Genuchten model （VG model）.. The parameter values for the VG model are determined with nonlinear simulation function of Matlab. Comparing a four-parameter model with a three-parameter model, the parameters are very close. However, the model with four-parameter can better fit the observed data, and has less error than the model with three-parameter. Furthermore, the norm of residual error square sum of calculated values and the observed values are less than 0. 07 %.

关 键 词：MATLAB VG模型 水分特征曲线 

分 类 号：P641.2[天文地球—地质矿产勘探] P641.131[天文地球—地质学]