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 Problem
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Henry's problem [1964] describes the process of saltwater with a density of 1025 kg/m3 intruding a confined aquifer from the the right side, while fresh water with a density of 1000 kg/m3 flows in at a constant rate from the left side. The density-driven flow in the completely saturated, homogeneous, porous and isotrope medium is modelled in a vertical profile of 2 m by 1 m.
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 Modelling
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The model area is discretized horizontally by 20 elements and vertically by 10 elements. An element therefore measures 1 m x 1 m. The mesh consists of 200 elements and 231 nodes.
A continuous volumetric current of 6.6 x 10-6 m3/s enters the model via the left boundary. Hydrostatic pressure is applied on the right boundary. The concentration at the right boundary is set to 3,57 x10-2 kg/kg. The upper and lower boundaries are no-flow boundaries.
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Results
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The intrusion was modelled for a time period of 100 minutes with constant time steps of 1 minute. The stria visualization below shows the course of the intrusion as well as the associated field of the flow velocities.
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STRING-visualisation of the same velocity field.
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