Time domain electromagnetic surveys for assisting in determining the groundwater resources at the Pearl Harbor Well Field, Island of Oahu
Time domain electromagnetic surveys for assisting in determining the groundwater resources at the Pearl Harbor Well Field, Island of Oahu
Date
2011-08
Authors
Nance, Tom
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Blackhawk Geosciences, Inc.
Tom Nance Water Resource Engineering
Tom Nance Water Resource Engineering
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Abstract
"This report contains the procedures and results of surface Time Domain Electromagnetic (TDEM) geophysical surveys performed for groundwater resource evaluation in Central Oahu near Kunia and Waipio Acres, Oahu. The property included land owned by the State of Hawaii Department of Land and Natural Resources (DLNR), Waikele Farms, Inc. (WFI) and Honbushin International Center (HIC). Zapata Incorporated (ZAPATA) performed the surveys for Belt Collins Hawaii Ltd. (BCH) and Tom Nance Water Resource Engineering (TNWRE) from July 13 through July 16, 2011.
The main objective of the TDEM surveys was to identify basal or high-level groundwater at the sounding sites to refine the boundary between the two. The surveys were conducted at five TDEM sounding sites to help determine the location for future groundwater wells.
TDEM is a geophysical method that determines from the surface the geoelectric section (resistivity layering) of the subsurface. From the geoelectric section, information about geology and water quality can be inferred. This is possible because the electrical resistivity of the earth depends on lithology, porosity, degree of saturation, and concentration of dissolved solids in the groundwater. Geophysical surveys, combined with other hydrogeologic information, are used to provide optimum locations for water well placement and well completion depths."
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Keywords
groundwater,
TDEM,
Pearl Harbor,
Ewa,
Oahu,
Hawaii,
Geology--Hawaii,
Groundwater--Hawaii,
Water-supply--Hawaii,
Geology,
Groundwater,
Water-supply
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25 pages
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