Using Marine Reflection Seismics to Identify Potential Seawater Intrusion Sites in the Upper Floridan Aquifer of Coastal Georgia and South Carolina
Foyle, Anthony M.
Henry, Vernon J.
Alexander, Clark R.
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The Upper Floridan aquifer (UFA) it the principal source of groundwater for coastal Georgia and South Carolina. A progressive increase in goundwater use since the late 1800s has resulted in a large (-30-mile radius) cone of depression on the aquifer's potentiometric surface that is centered on Savannah, GA. In coastal and inner shelf areas where the overlying Miocene aquitard is absent, the UFA is susceptible to seawater recharge. As part of the Sound Science Initiative (SSI), the Georgia Environmental Protection Division (EPD) recently funded geophysical mapping to identify those locations where the Miocene aquitard is thin or absent Geophysical surveys identified ten Areas of Concern (ADCs) where the UFA is susceptible to seawater intrusion. At each AOC, the aquifer is present at shallow depth, erosion has removed the aquitard, the overlying water column is saline, and the area lies within or adjacent to the Savannah cone of depression. Research results are contributing to a database of information being developed under SSI that will provide input necessary for managing groundwater resources in southeast Georgia.