Surface geophysical surveys of the freshwater-saltwater interface in a coastal area of Long Island, New York
1995
McNew, E.R. | Arav, S.
The North Fork of Long Island is a peninsula whose freshwater supply consists of several lenses of fresh ground water that are surrounded by saline ground water. A study to determine the thickness of one freshwater lens near the Village of Greenport used two surface-geophysical techniques at several sites to provide ground-conductivity data that were, in turn, used to estimate the depth to the freshwater-saltwater interface. Surveys were made during the spring and fall of 1989. Wells drilled during 1989 provided some verification of geophysical interpretations. Geophysical-data interpretations were based on conceptual models with two, three, and four conductivity layers; the three-layer concept produced interpretations that best matched geophysical measurements at all sites. The surface geophysical techniques were successful in interpreting depth to saline ground water. Interpreted depths to the freshwater-saltwater interface were compared to assess seasonal changes; the interpreted differences were small and within the range of error of the survey techniques.
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