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 %.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
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)
