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Soil Science Society of America Journal 63:1579-1585 (1999)
© 1999 Soil Science Society of America

DIVISION S-1-SOIL PHYSICS

Errors of Dual Thermal Probes Due to Soil Heterogeneity across a Plane Interface

J.R. Philipa and G.J. Kluitenbergb

a CSIRO Land and Water, G.P.O. Box 1666, Canberra, ACT 2601, Australia
b Dep. of Agronomy, Kansas State University, Manhattan, KS 66506 USA

gjk{at}ksu.edu

The dual thermal probe enables estimation of the thermal diffusivity, volumetric heat capacity (C), and thermal conductivity of soils. It has been much employed for moisture estimation because of the strong dependence of C on soil water content. The present study investigates the effectiveness of dual probes near heterogeneities. Exact solutions are found for four probe/soil configurations involving heterogeneity. In one configuration the heating probe is on the plane interface between different soils. For the three other configurations it is located close to three different discontinuities: near a soil surface and outside, and behind, a wetting front. Heterogeneity errors are found to be small provided the heterogeneity is no closer to the probes than probe separation (typically 0.006 m). Estimates of C may provide good resolution of soil water content in critical regions such as near surfaces and fronts.




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