Flow of water in porous media with saturation overshoot: A review

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...