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Surface Geophysical Surveys of the Freshwater‐Saltwater Interface in a Coastal Area of Long Island, New York
Author(s) -
McNew Elizabeth R.,
Arav Sara
Publication year - 1995
Publication title -
groundwater
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.84
H-Index - 94
eISSN - 1745-6584
pISSN - 0017-467X
DOI - 10.1111/j.1745-6584.1995.tb00317.x
Subject(s) - geophysics , geology , groundwater , surface water , geophysical survey , hydrology (agriculture) , spring (device) , range (aeronautics) , saline water , fresh water , oceanography , environmental science , salinity , geotechnical engineering , mechanical engineering , materials science , environmental engineering , engineering , composite material
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.