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publications > paper > characterization of saltwater intrusion in south florida using electromagnetic geophysical methods > conclusions
Characterization of Saltwater Intrusion in South Florida Using Electromagnetic Geophysical Methods
Conclusions
This example from south Florida demonstrates the utility of electromagnetic data for mapping saltwater intrusion in a coastal aquifer. Detailed electrical resistivity models of the subsurface are developed through inversion of helicopter electromagnetic data. These models show the features associated with natural saltwater intrusion and the effects of human activity in the Everglades. Time-domain electromagnetic measurements have played a secondary, but important, role in verifying the HEM interpretation. Borehole induction logs have been critical in developing a relationship between the geophysical resistivity model and ground-water quality, thereby enabling estimates of chloride content to be made from the geophysical results. These estimates are not as reliable as those obtained from actual well sampling, however, they effectively allow the well-sampling data to be reliably extended across the survey area at much greater sampling density, revealing features that would usually not be detected. This increased lateral detail comes at a price of lower vertical resolution compared to well data. However, by combining both types of data the advantages of each can be incorporated allowing estimation of water quality information needed for solute transport, ground-water flow models.
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