Release of heptane LNAPL (red) into an unsaturated homogeneous sand pack (darker grey) above a water-saturated homogeneous sand pack (yellow) showing downward migration to and pooling along the capillary fringe with further migration towards the water table, followed by lowering and raising the water table to create a smear zone. Black vertical bars are supports on the outside of the front glass wall. The original water table position is marked by a dashed black line drawn on the glass wall. Clear wells along the edges of the cell appear lighter. Darker region in the middle portion of the sand is caused by variation in lighting. (2 minutes)
A discussion of the material in this video provided in Section 6.2 “LNAPL Migration Followed by a Water Table Fluctuation” of the Groundwater Project book “Flow and Distribution of Non-Aqueous Phase Liquids”.
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Citation: Mumford, K., Kueper, B., Lenhard, R. & Poeter, E. (2024). LNAPL Migration Followed by a Water Table Fluctuation. Video of The Groundwater Project, Guelph, Ontario, Canada.