Preliminary Numerical Models of Saltwater Transport in Coastal Georgia and Southeastern South Carolina
Payne, D. F.
Provost, A. M.
Voss, C. I.
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Two preliminary saltwater transport models of the Savannah, Georgia—Hilton Head Island, South Carolina area and the Brunswick area were developed as part of a cooperative investigation by the U.S. Geological Survey (USGS) and the Georgia Department of Natural Resources, Environmental Protection Division (GaEPD) to assist the GaEPD in the development of management strategies for coastal ground-water resources. The Savannah-Hilton Head Island model was designed to test the effect of concentrated pumping on the steady-state, offshore, saltwater- freshwater interface. Results show that saltwater moves laterally from offshore and vertically downward through the confining unit toward the pumping site on a scale of 100,000 years. The Brunswick model was designed to test the movement of saltwater along a complex flow path toward a pumping well. Results show that saltwater moves upward from the source at depth through a vertical conduit, then laterally across the aquifer unit toward the pumping center, while mixing with freshwater. Future models will be refined to more accurately represent actual conditions.