利用优化方法求算Van Genuchten方程参数  

Parametric Estimation of the Van Genuchten′s Equation by the Optimization Method

作　　者：李春友[1] 任理[1] 李保国[1] 

机构地区：[1]中国农业大学土壤和水科学系,北京100094

出　　处：《水科学进展》2001年第4期473-478,共6页Advances in Water Science

基　　金：国家重点基础研究发展规划 ( 973)项目(G1 9990 1 1 80 3) ;"九五"国家重点科技攻关 ( 96 0 0 4 0 1 1 4 2 ) ;中国科学院封丘农业生态开放实验站基金~~

摘　　要：运用单纯形调优法 ,拟合描述土壤水分运动特征曲线的VanGenuchten参数。该方法可广泛地用于不同弯曲程度VanGenuchten方程曲线的拟合求参 ,拟合精度高 ,另一方面也表明VanGenuchten方程的线性选配适当。此外 ,算法程序用VB语言编写 ,实现了参数初值实时修改、多种数据格式输入输出和实时图形结果输出等多种友好人机界面功能 ,方便易用。According to the principle of simplex evolutionary method, the Van Genuchten's Equation (VGE) of the curves which are used to describe the feature of soil water movement are fitted. The method can be used to estimate the parameters of the VGE's curves which describe the feature of water movement of different matrixes' soil, and the fitting error is very small. The algorithm is coded by means of the Visual Basic. The program provides many different kinds of data-in and data-out formats which now are used frequently, has friendly man-machine interface, and is easy to use.

关 键 词：水分特征曲线 导水率 参数拟合 土壤水分运动 VanGenuchten方程 

分 类 号：S152.72[农业科学—土壤学]