"Combined use of frequency-domain electromagnetic and electrical resist" by John T. Ong, John W. Lane Jr. et al.

Earth and Atmospheric Sciences, Department of

 

Document Type

Article

Date of this Version

2010

Comments

Published by Ong, Lane, Zlotnik, Halihan & White in Hydrogeology Journal (2010)

Abstract

A frequency-domain electromagnetic (FDEM) survey can be used to select locations for the more quantitative and labor-intensive electrical resistivity surveys. The FDEM survey rapidly characterized the groundwaterflow directions and configured the saline plumes caused by evaporation from several groundwater-dominated lakes in the Nebraska Sand Hills, USA. The FDEM instrument was mounted on a fiberglass cart and towed by an all-terrain vehicle, covering about 25km/day. Around the saline lakes, areas with high electrical conductivity are consistent with the regional and local groundwater flow directions. The efficacy of this geophysical approach is attributed to: the high contrast in electrical conductivity between various groundwater zones; the shallow location of the saline zones; minimal cultural interference; and relative homogeneity of the aquifer materials.

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