Assessment of the application of percolation theory to a water repellent soil
Assessment of the application of percolation theory to a water repellent soil
复制标题
渗滤理论在防水土壤中的应用评估
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
R. Ewing
中科院分区：
文献类型：
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作者：
T. Steenhuis;A. Hunt;J. Parlange;R. Ewing
一些疏水颗粒在其他亲水砂使土壤疏水，可以完全改变水通过非饱和砂的流动。在本文中，我们将研究渗流理论是否可以解释这一现象。逾渗理论已被用来描述大规模的流动现象的非均匀性在孔隙尺度上发现的依赖性，因此，应该能够解释疏水土壤中的水流行为。我们表明，该理论是有效的，在一般情况下，一个亲水性的土壤，其中一个小的，但增加部分的高度疏水性的颗粒混合。然而，由于疏水颗粒的引入，渗透理论的应用受到了基质势和接触角效应之间复杂相互作用的限制。
A few hydrophobic grains in otherwise hydrophilic sand render the soil hydrophobic and can completely alter the flow of water through unsaturated sands. In this paper we examine whether percolation theory can explain the phenomenon. Percolation theory has been used to describe the dependence of large-scale flow phenomena on heterogeneities found at the pore scale and should, therefore, be able to explain the water flow behaviour in hydrophobic soil. We show that the theory is valid, in general, for a hydrophilic soil into which a small but increasing fraction of highly hydrophobic grains is mixed. However, the application of percolation theory is limited by the complex interactions of matric potential and contact angle effects due to the introduction of hydrophobic particles.