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Department of Water Resources Engineering, Lund Univ., Box 118, 221 00 Lund, Sweden
*Corresponding author (magnus.persson{at}tvrl.lth.se).
ABSTRACT
Several studies have shown that time domain reflectometry (TDR) can be used to measure water content and solute concentration during steady-state experiments with constant soil water content. Few studies have been carried out to identify the relationship between bulk electrical conductivity (
a) and soil solution electrical conductivity (w) to be used for transient conditions with varying water content. In this study, a single TDR probe was calibrated and found to accurately measure water content and a. The a measurements were fitted to w using several previously published models. The accuracy of the a and w measurements increased with a; however, the error in the w estimation was <10% for a higher than 5.7 mS m–1. The calibration was verified in a large sand column; a measurements were fitted to w measured in soil solution extracted with suction samplers. The calibration was also used in a transient solute transport experiment. If not accounted for, the temperature effects of the water content measurement introduce significant errors in the w estimations.
Received for publication January 25, 1996.
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