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 Laryea, K. B. Articles by Robin, M. J. L. Search for Related Content PubMed Articles by Laryea, K. B. Articles by Robin, M. J. L. Agricola Articles by Laryea, K. B. Articles by Robin, M. J. L.

Hydrodynamic Dispersion Involving Cationic Adsorption During Unsaturated, Transient Water Flow in Soil¹

ABSTRACT

The analysis of hydrodynamic dispersion of solutes during one-dimensional absorption (horizontal flow) of solution into soil columns is extended to solutes which interact with the soil particle surfaces. The exchange process involved is assumed to be instantaneous and is described by a nonlinear adsorption isotherm. The relevant equations are solved for the apparent longitudinal dispersion coefficient using a computer program written in system/360 CSMP.

Experiments with a clay loam soil indicated that when a concentrated solution of potassium chloride (KCl) (1N) infiltrates into a Ca²⁺-saturated soil, the apparent longitudinal dispersion coefficient is effectively velocity independent. This calculated coefficient reflects the possible combined effects of an immobile water fraction and salt exclusion.

¹ Contribution from the Dep. of Land Resource Science, Univ. of Guelph, Guelph, Ontario, Canada. The Authors acknowledge support from the Natural Sciences and Engineering Research Council of Canada and the Ontario Ministry of Agriculture and Food.

² Visiting Lecturer, Professor, and Research Associate, respectively.

Received for publication August 19, 1981. Accepted for publication March 18, 1982.