The electrical conductivity response of a profiling time-domain reflectometry probe
T. P. A. Ferré*,a,
D. L. Rudolpha,b and
R. G. Kachanoskia,c
a T.P.A. Ferre, Dep. of Hydrology and Water Resources, University of Arizona, Tucson, AZ 85721
b Dep. of Earth Science, University of Waterloo, Waterloo, ON, N2L 3G1 Canada
c Dean of Graduate Studies, University of Saskatchewan, Saskatoon, SK, S7N 5A4 Canada
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Fig. 1. Schematic diagram of one of the pair of profiling time domain reflectometry (TDR) rods and access tubes.
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Fig. 2. Waveforms collected with a profiling probe with 20-cm long target rods centered at a 90-cm depth during the advance of a 0.67 g L-1 KCl tracer step (electrical conductivity [EC] = 0.142 S m-1) applied at a rate of 0.0036 cm s-1 following steady-state infiltration with municipal water (EC = 0.040 S m-1). Waveforms are labeled with the elapsed time since the beginning of application of the tracer step.
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Fig. 3. The solute concentration inferred from the electrical conductivity response of a profiling probe during the advance of a 0.67 g L-1 KCl tracer step (points) calibrated using the solute pulse numerical integration method of Ward et al. (1994). The calculated breakthrough curve of a nondispersed solute pulse is shown as a solid line. Results are presented as a function of elapsed time since the beginning of application of the tracer step.
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Copyright © 2003 by the Soil Science Society of America.
