宁夏银北非饱和盐渍土水分特征曲线拟合研究

摘要

利用压力膜仪对宁夏银北地区盐渍土进行土壤水分特征曲线试验参数测定，为了降低对数值计算的影响，采用线性回归的方法对Van-Genuchten模型中的拟合参数α、n的初值进行了估算，经过对比后认为Van-Genuchten模型和Gardner-Williams模型均适用于拟合宁夏银北地区盐渍土的土壤水分特征曲线，但在提高数值精度方面Van-Genucht-en模型优势明显。%Volumetric pressure plate was measured test parameters of soil moisture curve of saline soil in Yinbei region of Ningxia Province. In order to reduce the influence of the numerical calculation,the linear regression method was used to estimated two initial values of Van-Genuchten the model. It was feasible that van Genuchten model and Gardner-Williams model can be used to fit the soil moisture curve of saline soil in this region according to numerical comparison. This study further shows that van Genuchten model have more advantages in improving the numerical accuracy than that of Gardner model.