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本文介绍一种田间原位测定饱和及准饱和水力传导度的新方法。通过同一入渗界面处不同吸力条件下测定一组稳定人渗量,即可测算K(φ)。本方法不仅可以用于表面圆盘吸力入渗仪,而且可以用于插入地下一部分的圆环入渗仪。采用改进的Wooding解分析薄层积水入渗,并结合数值模拟确定形状系数,该参数反映水力几何学和土壤特性间的关系,数值模拟结果表明,本方法的总体误差在±7%范围内。此外,此方法不需要测定难度较大的t~(1/2)入渗类型,也无需考虑接触层的厚度。由于仅使用一个入渗界面,因此,该方法可以使田间空间变异性对K(φ)的影响降到最低限度。
This paper presents a new method for in situ determination of saturated and quasi-saturated hydraulic conductivity. K (φ) can be calculated by measuring a set of steady infiltration rates under different suction conditions at the same infiltration interface. This method can be used not only for the surface disc suction infiltration device but also for inserting the ring infiltration device in a subterranean part. The modified Wooding solution is used to analyze the infiltration of thin-layer water infiltration and the shape coefficient is determined by numerical simulation. The parameter reflects the relationship between hydraulic geometry and soil properties. The numerical simulation results show that the overall error of this method is within ± 7% . In addition, this method does not require the determination of difficult t ~ (1/2) infiltration type, without regard to the thickness of the contact layer. Because only one infiltration interface is used, this method can minimize the influence of field variability on K (φ).