非相似介质方法在估计土壤水分特征曲线中的应用

Estimation of soil water retention characteristics with a non-similar-media method

根据非相似介质方法,利用颗粒大小分布、容重等资料,间接估计了位于黄淮海平原河南封丘地区土壤样品的土壤水分特征曲线。模拟结果表明,这种方法在低压力水头范围内预测效果较理想,但在水分特征曲线的后段,即高压力水头段非相似介质方法过低地估计了压力水头值,效果相对较差。同时文中还对造成这一现象的原因进行了探讨。

The authors used a nonsimilarmedia(NSM) method to estimate soil water retention characteristic based on measured soil physical properties,such as particle size distribution and bulk density.Results indicate that reasonable agreements between estimated and measured water retention characteristic were obtained by NSM method for relatively lowpressure head.The pressure head in the dry end of the retention characteristic was underestimated.Applicability of this method was also discussed.