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In aquifers in which freshwater flows above saltwater, a mixing layer develops between the two water bodies. In a typical regional aquifer, this mixing layer is thin compared to the length scale of the aquifer. Its modeling by available numerical codes is impractical due to the needed fine discretization. Here, an approximate model of the mixing layer in steady state 3D flow is developed, based on...
We consider 3D steady flow of fresh water over a salt water body in a confined aquifer of constant thickness D, with application to a pumping well in a coastal aquifer. With neglect of mixing, a sharp interface separates the two fluid bodies and an existing analytical solution, based on the Dupuit assumption, is adopted. The aim is to solve for the mixing between the fresh and salt waters for α ...
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