2-Seawater Intrusion Due to Freshwater Draft in Coastal Aquifers.

Abstract

Freshwater pumping from coastal aquifers need to be properly planned to avoid aggressive seawater intrusion into freshwater aquifers. A Galerkin finite element model with sharp interface approach is adopted to simulate the seawater freshwater dynamics in coastal phreatic aquifers due to freshwater draft. The model considers a hypothetical aquifer to analyze the effect of freshwater pumping on seawater intrusion. The results indicated that freshwater withdrawal from the seawater intruded zone (two fluid zone) need to be carefully monitored to avoid seawater upcoming which will pollute the overlying freshwater zone. The effect of freshwater withdrawal on the seawater freshwater dynamics decreases for locations farther from the intruded zone.