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Proceedings Paper

Ground penetrating radar imaging of the freshwater/saltwater interface on a carbonate island, Key Largo, Florida
Author(s): Sarah E. Kruse; James C. Schneider; James A. Inman; James A. Allen
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Paper Abstract

Finite-difference time-domain models of radar wave propagation at freshwater/saltwater transition zones indicate that a reflected event from the electrical conductivity gradient at the top of the transition zone may be detected. Ground penetrating radar surveys were used together with a suite of geophysical techniques in a reconnaissance survey to delineate the freshwater lens on the island of Key Largo, Florida, USA. In the interior of north Key Largo, the water table lies at approximately 3 m depth. There a 1 - 1.5-m thick freshwater lens overlies a 2 to 3-m transition zone to saline water. 50 MHz GPR surveys show a strong water table event followed by a weaker event that correlates with the top of the freshwater/seawater transition. Nearby cores show no lithologic discontinuities in this depth range. In lower-lying areas with minimal freshwater, an enigmatic high-amplitude high-frequency event follows the water table event closely in time. The field data indicate that reflections from the freshwater/saltwater interface may be resolved in environments with fresh water above the transition zone and with a relatively sharp conductivity gradient at the top of the freshwater/saltwater interface.

Paper Details

Date Published: 27 April 2000
PDF: 6 pages
Proc. SPIE 4084, Eighth International Conference on Ground Penetrating Radar, (27 April 2000); doi: 10.1117/12.383588
Show Author Affiliations
Sarah E. Kruse, Univ. of South Florida (United States)
James C. Schneider, Univ. of South Florida (United States)
James A. Inman, Univ. of South Florida (United States)
James A. Allen, Univ. of South Florida (United States)


Published in SPIE Proceedings Vol. 4084:
Eighth International Conference on Ground Penetrating Radar
David A. Noon; Glen F. Stickley; Dennis Longstaff, Editor(s)

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