土壤水分特征曲线VG模型参数求解对比分析

Contrast Analysis on Soil Water Characteristic Curve of VG Model Parameters

采用负压计对砂壤土试样进行了土壤水吸力和对应含水量的测量,并分别运用RETC软件和Matlab软件对不同水分处理土壤水分特征曲线VG模型进行了拟合计算,然后将拟合值与实测数据进行对比分析。结果表明,Matlab和RETC软件均可用于土壤水分特征曲线VG模型的参数求解,Matlab软件比RETC软件拟合的误差小,拟合效果明显优于RETC软件,RETC软件对极端干旱区砂石占绝对比重的砂壤土拟合效果不佳。

Water-absorbing power and corresponding water content of sandy loam samples were measured with negative presure and VG model of soil water characteristic curve with different water were accordably calculated with RETC software and Matlab software respectively,then the contrast analysis was conducted on fitting value and measured data.The result showed that both Matlab and RETC softwares can be used to solve the parameters of VG model of soil water characteristic curve,Matlab has less fitting errors than RETC software,its fitting effects were better than that of RETC software.RETC software performed its poor fitting effect on absolute proportion of sandy loam in the extremely arid region.