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《Journal of Irrigation and Drainage》 2012-06
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Calculate the van Genuchten Equation Parameters Based on PSO

DU Guo-ming1,ZHANG Yu-liang2(1.School of Geography and Planning,Sun Yat-sen University,Guangzhou 510275,China; 2.Map Publishing House of Shandong Province,Jinan 510275,China)  
The calculation of the van Genuchten equation parameters belongs to the complex nonlinear fitting problem,which is difficult to be resolved by the traditional methods.The particle swarm optimization(PSO) was applied in this paper to introduce a new method of effectively calculating the van Genuchten equation parameters.By means of the written programs of using Visual Basic.NET language,the experiments were performed based on the imbibition and drainage silt loam soil measure data.First,the objective function was established.Second,the fitting values of every particles were calculated.Third,the minimum error of square sum(MESS) was found by the particles searching optimal value automatically after the iterative computation.Finally,the parameters corresponding to the minimum error of square sum were equation solutions.Compared with other methods using MESS,the PSO was proved to be an effective algorithm for calculating the van Genuchten equation parameters with the simpler program,higher speed running and higher fitting precision.
【Fund】: 中央高校基本科研业务费专项资金项目(2011370003161401);; 国家重点基础研究发展计划(973计划)项目(2011CB707103);; 国家高技术研究发展计划(863计划)项目(2012AA121402)
【CateGory Index】: O241.8
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