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 Bresler, E. Articles by Laufer, A. Search for Related Content PubMed Articles by Bresler, E. Articles by Laufer, A. Agricola Articles by Bresler, E. Articles by Laufer, A.

Anion Exclusion and Coupling Effects in Nonsteady Transport Through Unsaturated Soils: II. Laboratory and Numerical Experiments¹

ABSTRACT

A numerical model for the simultaneous transport of anions and water as developed in Part I of this work was compared with measured chloride and water flow data. Laboratory soil-column experiments were conducted under conditions of infiltration, redistribution, and evaporation of water in the upper part of the soil profile. The effects of convection, ionic diffusion, mechanical dispersion, anion exclusion, and water flow in response to salt concentration gradients on the comparison between numerical and measured data were considered jointly. The agreement between theory and experiment, as expressed by flow into and out of the soil column and by water content and salt distribution profiles, was generally good. The results were relatively insensitive to anion exclusion and osmotic effects. Estimates of dispersivity as obtained from miscible displacement experiments were found to be sufficient for prediction purposes. The numerical as well as the laboratory data indicate that for the conditions studied, osmotic gradients and anion exclusion effects are of minor importance.

¹ Contribution from the Volcani Center, Agr. Res. Org., Bet Dagan, Israel. 1973 series, no. 259-E.

² Head, Dep. of Soil Physics, and Laboratory Technician, respectively, the Volcani Center, ARO, Bet Dagan, Israel.

Received for publication September 7, 1973. Accepted for publication November 8, 1973.