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 Todd, R. M. Articles by Kemper, W. D. Search for Related Content PubMed Articles by Todd, R. M. Articles by Kemper, W. D. GeoRef GeoRef Citation Agricola Articles by Todd, R. M. Articles by Kemper, W. D.

Salt Dispersion Coefficients Near an Evaporating Surface¹

ABSTRACT

A series of laboratory experiments was conducted to gain detailed information on water and salt movements near an evaporating surface.

Columns instrumented with tensiometers and Richards' salinity sensors were used with coarse- and fine-textured soils. Water was supplied to a water table at the base of the columns and approximately steady state evaporation from the soil surface was established. Dispersion coefficients were calculated from salt gradients and evaporation rates in regions of the soil where suctions ranged from 0.1 to several bars. Dispersion increased with increased solution flux and average solution velocity. Values obtained for dispersion coefficients corresponded closely with those obtained by other workers under more nearly saturated conditions at similar rates of solution flux.

¹ Contribution from the Agronomy Department, Colorado State University, Ft. Collins, and the US Soils Laboratory, Soil & Water Conservation Research Division, ARS, USDA, Beltsville, Md. Portions of this work were supported by the Office of Water Resources Research (GP 4842).

² Graduate Research Assistant, Agronomy Dept., Colorado State Univ.

³ Formerly Professor, Colorado State Univ.; presently Director, US Soils Laboratory, Beltsville, Md. 20705.

Received for publication August 1, 1971. Accepted for publication April 4, 1972.