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Evaluating the linear dielectric constant-electrical conductivity model using time-domain reflectometry

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Author

Summary, in English

Recently, Hilhorst (2000) presented a theoretical model describing a linear relationship between bulk electrical conductivity, sigma(a), and dielectric constant, K-a, in moist soil. Hilhorst (2000) found that using this linear relationship, measurements of the pore water electrical conductivity, sigma(p), can be made in a wide range of soil types without soil-specific calibrations. If accurate measurements were to be made, only one parameter had to be optimized. In the present study, the linear model was evaluated using detailed time-domain reflectometry (TDR) measurements in coarse sand, medium sand and loamy sand. It was shown that the measured slope of the linear model was lower than expected. A reason for this might be that the K-a of the pore water is smaller than that of free water due to the presence of bound water. The results showed that the linear model was as good as other commonly used models for sigma(p) predictions.

Publishing year

2002

Language

English

Pages

269-277

Publication/Series

Hydrological Sciences Journal

Volume

47

Issue

2

Document type

Journal article

Publisher

Taylor & Francis

Topic

  • Water Engineering

Keywords

  • time-domain reflectometry
  • dielectric
  • Sigma probe
  • constant
  • electrical conductivity

Status

Published

ISBN/ISSN/Other

  • ISSN: 0262-6667