Analysis of saltwater intrusion beneath an oceanic island

Abstract EN

The position of saltwater-freshwater interface beneath an oceanic island was analyzed.

Governing partial differential equations were formulated by combining Darcy’s Law and continuity equation by using Ghyben-Hcrzberg Principle and Dupuit assumptions.

For the solution of the governing equations.

Finite Difference Method was used.

A computer program based on two-dimensional steady-state mathematical model was improved and mod- ified.

As sufficient and reliable Field data are unavailable for an oceanic island, the program has been verified using two simplified flows for which analytical solutions are available, namely, radial flow in a circular island and one dimensional flow in a strip island.

The program was then applied for three other aquifers of square, rectangular, and irregular shape.

The effects of is- land geometries, aquifer characteristics and various imposed conditions on saltwater intrusion were analyzed.