June Mirecki reports that Scott Prinos (USGS Florida Water Science Center) has defined the saltwater interface in the Biscayne Aquifer (Quaternary karstic limestones) very precisely using induction logging methods. Induction logging is especially appropriate for use in a limestone, where the clay layers do not obscure the response to salt water.
See references:
Prinos, S.T., 2014, Using state-of-the-art technology to evaluate saltwater intrusion in the Biscayne aquifer of Miami-Dade County, Florida: U.S. Geological Survey Fact Sheet 2014 to 3050, 6 p.
Prinos, S.T., 2013, Is a salinity monitoring network "Worth its salt"?: U.S. Geological Survey Fact Sheet 2013 to 3079, 2 p.
Prinos, Scott T., 2013, Saltwater intrusion in the surficial aquifer system of the Big Cypress Basin, southwest Florida, and a proposed plan for improved salinity monitoring: USGS Open-File Report: U.S. Geological Survey Open-File Report 2013-1088, 58 p.
You can also contact him directly at stprinos@usgs.gov Rob Esquilin reports that there have been various studies using geophysical tools to study the freshwater/saline water interface in San Antonio and Austin, TX by the USGS.
See references:
Jonathan V. Thomas, Gregory P. Stanton, 2013, Borehole geophysical, fluid, and hydraulic properties within and near the freshwater/saline-water transition zone, San Antonio segment of the Edwards aquifer, south-central Texas, 2010-11, Fact Sheet 2013-3078
Jonathan V. Thomas, Gregory P. Stanton, Rebecca B. Lambert, 2012, Borehole geophysical, fluid, and hydraulic properties within and surrounding the freshwater/saline-water transition zone, San Antonio segment of the Edwards aquifer, south-central Texas, 2010-11 Scientific Investigations Report 2012-5285
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