Linkage of Offshore and Onshore Hydrogeologic Data for Coastal Georgia and Adjacent Parts of South Carolina and Florida Using a Geographic Information System
Laitta, Michael T.
MetadataShow full item record
To characterize ground-water flow and movement of saltwater into freshwater zones, the U.S. Geological Survey (USGS), in cooperation with the Georgia Department of Natural Resources, Environmental Protection Division, is developing regional ground-water flow and solute transport models for the Floridan aquifer system and shallower aquifers in coastal Georgia and adjacent parts of South Carolina and Florida. In support of these modeling efforts, structure- contour and thickness maps are being constructed using seismic, geophysical, lithologic, and paleontologic data in a 37,000-square mile (mi²) area that includes a 8,000 mi² offshore region. Constructing these maps is a challenge because (1) the spatial distribution of onshore data is distinctuly more dense than that of offshore data; and (2) different types of data are used to identify hydrogeologic units in different areas. Prior to this study, no attempts had been made to integrate and construct a seamless geospatial hydrogeologic framework linking both onshore and offshore interpretations. Objectives of this study include identifying areas with insufficient data coverage; evaluating how well various hydrogeologic interpretations coalesce; and determining the extent to which offshore hydrogeologic data reflect known structural features.