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Soil-Water Diffusivity Values Based Upon Time Dependent Soil-Water Content Distributions¹

ABSTRACT

A laboratory method based upon time dependent soil-water content distributions is presented for calculating isothermal soilwater diffusivity values for soils at 5 to 15 volume percent water. The redistribution of water within sealed soil columns was monitored by gamma-radiation attenuation at approximately 100 to 1,000 hour intervals over a period exceeding 3 months. Diffusivity values from numerical integration of the diffusion equation were obtained easily and compared favorably with those of previous investigators.

¹ Contribution from the Department of Water Science and Engineering, University of California, Davis. This work was partially supported by funds from the U.S. Army Electronics Research and Development Activity, Ft. Huachuca, Arizona, under Grant no. DAAB G29-07-67-C00034 and by the Water Resources Center, University of California.

² Laboratory Technician, Assistant Professor, and Associate Professors, respectively. The present address of the second author is Department of Agricultural Chemistry and Soils, University of Arizona, Tucson.

Received for publication March 20, 1968. Accepted for publication July 24, 1968.