Abstract
This paper deals with seawater intrusion in a coastal aquifer, where close to the coast the aquifer is divided into a number of subaquifers by impervious, relatively thin layers. As a result of changing the total fresh-water discharge to the sea, seawater intrusion occurs as a separate advancing wedge in each of the subaquifers. Assuming everywhere flow normal to the coast line, and essentially horizontal in both the fresh-water and the salt-water zones, the complete mathematical model is first stated in terms of depth to the interface in each subaquifer. A numerical finite-difference scheme is then presented for solving the model for the case of a two-layered aquifer. Principles of a method for extending the model to a larger number of subaquifers is described.
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