Water velocity at water-air interface is not zero: Comment on "Three-dimensional quantification of soil hydraulic properties using X-ray computed tomography and image-based modeling'' by Saoirse R. Tracy et al.
文献类型： 外文期刊
第一作者： Zhang, X. X.
作者： Zhang, X. X.;Fan, X. Y.;Li, Z. Y.;Fan, X. Y.;Li, Z. Y.
作者机构：
期刊名称：WATER RESOURCES RESEARCH （ 影响因子：5.24； 五年影响因子：6.006 ）
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年卷期：
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收录情况： SCI
摘要： Tracy et al. (2015, doi: 10.1002/2014WR016020) assumed in their recent paper that water velocity at the water-air interface is zero in their pore-scale simulations of water flow in 3-D soil images acquired using X-ray computed tomography. We comment that such a treatment is physically wrong, and explain that it is the water-velocity gradient in the direction normal to the water-air interface, rather than the water velocity, that should be assumed to be zero at the water-air interface if one needs to decouple the water flow and the air flow. We analyze the potential errors caused by incorrectly taking water velocity at the water-air interface zero based on two simple examples, and conclude that it is not physically sound to make such a presumption because its associated errors are unpredictable.
分类号： TV21
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