The dependence of the electrical conductivity measured by time domain reflectometry on the water content of a sand

Paul A Ferre, J. D. Redman, D. L. Rudolph, R. G. Kachanoski

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

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.

Original languageEnglish (US)
Pages (from-to)1207-1213
Number of pages7
JournalWater Resources Research
Volume34
Issue number5
StatePublished - May 1998
Externally publishedYes

Fingerprint

time domain reflectometry
Water content
electrical conductivity
Sand
probes (equipment)
water content
sand
probe
cables (equipment)
Sodium Chloride
cable
sodium chloride
Cables
calibration
Calibration
Drainage
Electric Conductivity
porewater
drainage
Water

ASJC Scopus subject areas

  • Aquatic Science
  • Environmental Science(all)
  • Environmental Chemistry
  • Water Science and Technology

Cite this

The dependence of the electrical conductivity measured by time domain reflectometry on the water content of a sand. / Ferre, Paul A; Redman, J. D.; Rudolph, D. L.; Kachanoski, R. G.

In: Water Resources Research, Vol. 34, No. 5, 05.1998, p. 1207-1213.

Research output: Contribution to journalArticle

Ferre, Paul A ; Redman, J. D. ; Rudolph, D. L. ; Kachanoski, R. G. / The dependence of the electrical conductivity measured by time domain reflectometry on the water content of a sand. In: Water Resources Research. 1998 ; Vol. 34, No. 5. pp. 1207-1213.
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