HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Selim, H. M. Articles by Amemiya, M. Search for Related Content PubMed Articles by Selim, H. M. Articles by Amemiya, M. Agricola Articles by Selim, H. M. Articles by Amemiya, M.

A Comparison of Two Methods for Determining Soil Water Diffusivity¹

ABSTRACT

Two methods were used concurrently to determine the soil water diffusivity from horizontal infiltration of water into a soil column. In the first (recent), water content measurements were taken at a fixed position as a function of time by using the gamma attenuation technique. In the second, water content distance distributions were determined as a function of distances from the water source at a fixed time by sectioning the same column. A comparison by the two methods of the diffusivity function for three soil materials showed that the first method is as reliable as the second. Agreement of the diffusivities obtained from the two methods is considered evidence of the validity of the unsaturated water flow equation.

¹ Journal Paper no. J-6250 of the Iowa Agr. & Home Econ. Exp. Sta., Ames. Projects no. 1653 and 998. Supported by the Office of Water Resources, US Department of the Interior, as authorized under the Water Resources Research Act of 1964, Public Law 88-379 and US Atomic Energy Contract AT (11-1)-1269, Report no. 000-1269-17.

² Research Assistant, Professor, and Associate Professor of Agronomy, Iowa State University of Science and Technology, Ames.

Received for publication May 5, 1969. Accepted for publication August 1, 1969.