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Combined use of frequency-domain electromagnetic and electrical resistivity surveys to delineate near-lake groundwater flow in the semi-arid Nebraska Sand Hills, USA |
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| Authors: | John B Ong John W Lane Jr Vitaly A Zlotnik Todd Halihan Eric A White |
| Institution: | 1. Department of Geosciences, University of Nebraska-Lincoln, 214 Bessey Hall, Lincoln, NE, 68588, USA 2. Office of Groundwater, Branch of Geophysics, US Geological Survey, 11 Sherman Place, Unit 5015, Storrs Mansfield, CT, 06269, USA 3. School of Geology, Oklahoma State University, 105 Noble Research Center, Stillwater, OK, 74078, USA |
| 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 groundwater-flow 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 25 km/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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