用遗传算法优化估计VanGenuchten方程参数.pdfVIP

22 2 V o l22 No2 200 8 4 Geot echnical Engineering T echnique A pr , 200 8 : 2008 用遗传算法优化估计Van Genuchten 方程参数 许小健 黄小平 张金轮 ( , 230009 V an Genuchten , , , V an G enucht en , V an G enuchten Van G enuchten ; ; ; S 152 . 7 Using Genetic Algorithm to Estimate Parameters of Van Genuchten Equation Xu X iaoj ian H uang X iaoping Zhang Jinlu n ( Scho ol o f Civil Engineer ing , H ef ei U niv ersity of T echno lo gy , H ef ei A nhui 230009 China Abstract T he V an Genuchten Equation ( VG E w hich is u sed to descr ibe the f eatur e of soil w ater mov ement is superset and no nlinear. U sing tr aditional met ho d calculat ing the V GE s par amet ers often results w ith a hig h marg in of erro r because o f co mplicatio n and artif icial f act ors . Genet ic A lgo rit hm s ( G A is a new outstanding ev olutionary co mputatio n method fo r solving co mplex nonlinear model. T herefo re, application of r ea l coding that based P olyPo pulat ion Genetic A lg or ithm ( PP GA on the VG Es parameter s optimizatio n is pr oposed. T he results show that PPG A is a hig h eff ectiv e a lg orithm w ith many go od pr oper t ies such as f ast computing speed , hig h eff iciency, hig h precision , small ar tif icial f acto rs and so on . Consequently, PP GA is a new metho d fo r calculating V an Genuchten equation par ameters . Key Words V an Genuchten Equat ion ; parameter optimization ; soil w ater character