Paleochannel Delineation for Water-Supply Management
at U.S. Marine Corps Air Station, Cherry Point, North Carolina:
A Geographical Information System Application
Project Abstract
By Beth M. Wrege
Abstract
An unconfined paleochannel and associated discontinuities in confining units that underlie the western edge of Cherry Point Marine Corps Air Station were delineated for water-supply management using geophysical methods. Subsurface information including hydrogeologic characteristics and pathways for contamination are to be added to the Air Stations' existing geodatabase. Among the issues to be addressed is the need to identify and locate paleochannels or probable conduits for contamination to the drinking-water aquifer in order to maintain a sustainable ground-water source.
Results of this study indicate that where the westernmost paleochannel is present, the confining units separating the Castle Hayne aquifer from the Yorktown and surficial aquifers are absent. Stratigraphic test wells were drilled and continuous core was recovered to describe and verifying the lithology. Geophysical methods used for paleochannel delineation included borehole geophysics, vertical seismic profiling, and high-resolution land and marine seismic-reflection profiling. Borehole geophysical data and land-seismic data were calibrated by using the vertical seismic profiling.
Attributed data layers describing the hydrogeologic characteristics of the subsurface were developed. A two-dimensional georeferenced panel of the subsurface underlying Slocum Road seismic line was constructed. These subsurface data layers, in conjunction with the existing surficial and infrastructure data layers, will provide the Air Station with a more complete spatial reference for water-supply management.
Citation:
Wrege, B.M., 2003, Paleochannel delineation for water-supply management at U.S. Marine Corps Air Station, Cherry Point, North Carolina: A geographic information system: in Proceedings of the 2003 ASPRS Annual Convention, May 5-9, Anchorage, AK, May 5-9, 2003.
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North Carolina Water Science Center
U.S. Geological Survey
3916 Sunset Ridge Road
Raleigh, North Carolina 27607
(919) 571-4000
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