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首页> 外文期刊>Journal of plant nutrition and soil science >Measuring near-saturated hydraulic conductivity of soils by quasi unit-gradient percolation-2. Application of the methodology
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Measuring near-saturated hydraulic conductivity of soils by quasi unit-gradient percolation-2. Application of the methodology

机译：通过准单位梯度渗透-2测量近饱和液压导电性。 方法的应用

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Sarkar et al. (this issue) proposed a laboratory measurement method for obtaining the hydraulic conductivity of soil at near-saturated moisture conditions, bridging the gap between measurements that can be obtained with the evaporation method in the medium dry region, and measurements of the saturated conductivity by traditional methods. The method is based on a tension infiltration on a limited part of the surface of a soil sample and drainage of the sample at the same tension, leading to a divergent flow field. Despite equal tensions at top and bottom of the sample ("unit gradient"), the water flux in the sample is smaller than the corresponding value of the soil hydraulic conductivity at the applied tension. From numerical analysis of the flow problem, they concluded that unsaturated conductivity can be obtained with an accuracy of 10% for all texture classes of the USDA soil texture triangle. In this paper, we test the methodology for three different soil types using an appropriate apparatus. The results match well with independent saturated conductivity measurements on the wet side, and with unsaturated conductivity measurements in the medium moisture range that were obtained with the evaporation method.
机译：Sarkar等。 （本期问题）提出了一种用于获得近饱和水分条件下土壤液压导电性的实验室测量方法，弥合在中间干燥区域中蒸发方法可以获得的测量之间的间隙，以及通过传统的饱和电导率测量方法。该方法基于张力渗透在土壤样品表面的有限部分上，并在相同的张力下引导样品的排水，导致发散流场。尽管样品的顶部和底部（“单位梯度”的顶部和底部相等，但样品中的水通量小于施加张力下的土壤液压导电性的相应值。根据对流动问题的数值分析，它们得出结论，可以获得不饱和电导率，以满足美国农业部土壤纹理三角形的所有纹理类别的准确度。在本文中，我们使用合适的装置测试三种不同土壤类型的方法。结果良好地匹配湿侧的独立饱和电导率测量，并且在用蒸发方法获得的介质水分范围内具有不饱和的电导率测量。

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