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Characterization And Modeling Of Seawater Intrusion In An Aquifer Along The West Coast Of BarbadosNormal access

Authors: D.A. Farrell, S.K. Sandberg, B.L. Mayers, A. Sutherland, H. Barnes, J. Nurse and L. Moseley
Event name: 17th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems
Session: Posters
Publication date: 22 February 2004
Organisations: EEGS
Language: English
Info: Extended abstract, PDF ( 2.9Mb )

A series of non-invasive geophysical surveys was performed at a pilot site on Barbados as part of
a geologic and hydrologic characterization effort to develop a long-term sustainable management
framework for karst aquifers along the island’s west coast. The geophysical surveys included timedomain
electromagnetic soundings, Schlumberger D.C. resistivity depth soundings, high-resolution
dipole-dipole profiles for tomographic imaging, and shallow ground conductivity profiles. Results
from the surveys showed (i) a relatively thin freshwater lens, with the transition zone between the
freshwater and the underlying seawater being relatively thin, (ii) the presence of several potential
groundwater flow conduits, (iii) the contact between the overlying permeable limestone unit and the
underlying low permeability sedimentary units, and (iv) the near-surface contact between the
limestone units and beach and dune deposits. These observations were used to develop and
implement a conceptual model of groundwater flow and seawater intrusion for the site. Preliminary
results from the hydrologic model compare favorably to an electrical resistivity cross-section
developed for a portion of the site.

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