两种非饱和导水参数推求方法在紫色土上的应用

土壤非饱和导水参数的难于获取,限制了非饱和水流数值模拟技术的实际应用。本研究选择颇具代表性的土壤水分特征曲线推求法和简单入渗法两种方法,分别推求不同质地紫色土导水参数,并进行了分析比较。结果显示,土壤水分特征曲线推求法和简单入渗法,推求的非饱和导水率与计算值均具有较好的一致性。鉴于土壤水分特征曲线的易测优势和简单入渗法实验简便省时特点,采用这两种方法进行紫色土非饱和导水参数的推求或预报是可行的。

Application of Two Methods of Estimating Soil Hydraulic Properties on Purple Soil

Soil unsaturated hydraulic properties were not available,which restricted the technology of unsaturated hydraulic simulation to be applied to the field.In this research two representative methods of estimating soil hydraulic properties based on soil water retention curve and simple infiltration were employed,and unsaturated hydraulic properties were estimated and compared by these two methods for different textural purple soils.The results showed that the unsaturated conductivities estimated by soil water retention curve and simple infiltration were in good agreement with calculated unsaturated conductivities.Because of the advantage of measuring easily for soil water retention curve and the characters of simple experiment and time-saving for the simple infiltration,these two methods being employed to estimating purple soil unsaturated hydraulic properties were feasible.