NUMERICAL MODEL OF SEAWATER INTRUSION IN AQUIFERS.

The finite element method with a Galerkin formulation is used to solve the vertically integrated governing equations. The Seawater Intrusion Model (SWIM) accounts for a variety of aquifer situations that occur in the field. Numerical experiments were performed using the 1-D gravitational segregation problem to judge the sensitivity of the model, and particularly the toe tracking algorithm, to different parameters and options. Other applications and verifications of the SWIM code are also included: classical 1-D seawater intrusion in a leaky coastal aquifer, injection of freshwater into a saline aquifer and sea-water intrusion toward a pumping well.