Flow of water in porous media with saturation overshoot: A review
Flow of water in porous media with saturation overshoot: A review
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饱和度超调的多孔介质中的水流：综述
DOI：
10.1016/j.jhydrol.2013.12.043
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发表时间：
2014-03
影响因子：
6.4
通讯作者：
Yunwu Xiong
中科院分区：
文献类型：
--
作者：
Yunwu Xiong
与经典的润湿模式不同，饱和度超调（也称为饱和凸点或非单调饱和剖面）在非饱和多孔介质中广泛存在。饱和度超调是指在湿润锋正后方有一个高而均匀的含水量区域，随后是另一个低而均匀的饱和度区域。本文从实验观测和理论模型发展两个方面综述了近年来这一反常现象的研究进展。发生过冲的实验条件一般与重力驱动指状流的条件一致。饱和度超调与相应的毛细管压力超调有关。理查兹方程的基本形式由于其抛物性和物理上的不完备性而不能描述非单调饱和场。几次尝试修改的理查兹方程和最近提出的其他方法进行了审查和评估。最后总结了饱和超调量的研究现状和存在的问题。
Different from classic wetting patterns, saturation overshoot (also called saturation-bump or non-monotonic saturation profile) is widely observed in unsaturated porous media. Saturation overshoot is the case of a high and uniform water content zone directly behind the wetting front followed by another region with a low and uniform saturation. This paper reviews recent research progress on this anomalous phenomenon, focusing on experimental observations and theoretical model development. Experimental conditions for the occurrence of overshoot generally coincide with those of gravity-driven fingered flow. Saturation overshoot is associated with the corresponding capillary pressure overshoot. The Richards equation in its basic form cannot describe the non-monotonic saturation field due to its parabolic nature and incompleteness in physics. Several attempts to modify the Richards equation and other approaches proposed recently have been reviewed and assessed. The knowledge gaps and research opportunities on saturation overshoot are summarized at the end.
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通讯作者：
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DOI：
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期刊：
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