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Detailed Reference Information |
Ferré, P.A., Redman, J.D., Rudolph, D.L. and Kachanoski, R.G. (1998). The dependence of the electrical conductivity measured by time domain reflectometry on the water content of a sand. Water Resources Research 34: doi: 10.1029/98WR00218. issn: 0043-1397. |
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We present paired measurements of the water content and electrical conductivity collected in a laboratory column packed with a homogeneous, clean sand over a wide range of water content and pore water electrical conductivity (EC) conditions. The EC was determined using the method of Nadler et al. <1991> from waveforms collected with two-rod time domain reflectometry (TDR) probes with and without baluns and with three-rod probes without baluns. Following Heimovaara et al. <1995>, we calibrated the probes in saline solutions to account for the series resistance of the cable and connectors. The calibrated EC shows a nonlinear dependence on the water content that is well described by a simple power relationship <Archie, 1942>. Recognizing that calibration in saline solutions is impractical for some TDR probes, we demonstrate that the EC response can be calibrated directly using the results of drainage events, incorporating only a separate calibration of the cable resistance. None of the probe designs shows any clear advantage for EC measurement. ¿ 1998 American Geophysical Union |
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Abstract |
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Keywords
Hydrology, Groundwater hydrology, Hydrology, Soil moisture |
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Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
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