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SIMULTANEOUS HEAT AND MASS TRANSFER IN SOIL COLUMNS EXPOSED TO FREEZING/THAWING CONDITIONS1

Nassar, I. N.2; Horton, Robert3; Flerchinger, G. N.4

Technical Articles
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Soil heat and mass transfer are important processes in nature The effects of soil solution concentration on soil heat and mass transfer have not been investigated thoroughly for freezing/thawing conditions. The objective of this study was to evaluate the SHAW model predictions of heat, water, and chemical transfer in saline and solute-free soils. Heat and mass transfer was studied in closed soil columns. Included were loam soil materials with two salinity levels. Three derivatives of benzoic acid were used as tracers for liquid water movement. Soil was packed into PVC columns that were buried vertically in a field soil profile and exposed to ambient weather conditions. After 72 days, the soil columns were removed from the field and sectioned into 0.02-m increments in order to measure water content, chloride, and benzoic acid tracer distributions. In addition to the observed heat and mass transfer, the SHAW model was used to predict heat and mass transfer in the soil columns. The model described the temperature distributions accurately for both salinized and solute-free soils. Both observed and predicted values of water distribution showed water accumulation in the upper 0.4 m in the solute-free soil. The water diminished slightly in the upper 0.20-m region in the salinized soil columns. Within the salinized soil columns, the final solute distribution did not indicate appreciable net solute movement. The observed and predicted frost depths in the solute-free soil were between 0.45 m and 0.65 m. Freezing was not significant in the salinized soil. The SHAW model should be improved if it is expanded to include the effects of temperature and osmotic potentials on liquid water flow in soil.

1Journal Paper No. J-18451 of the Iowa Agric, and Home Econ, Exp, Stn., Ames, Iowa. Projects No. 3262 and 3287, supported, in part, by the Hatch Act and State of Iowa funds.

2Alexandria University, Faculty of Agriculture-Damanhoar, Egypt.

3Department of Agronomy, Iowa State University, Ames, IA 50011. Dr. Horton is corresponding author. E-mail: rhorton@iastate.edu

4USDA-ARS, Northwest Watershed Res. Center, 800 Park Blvd., Suite 105, Boise, ID 83712.

Received June 17, 1999; accepted Oct 22, 1999.

© 2000 Lippincott Williams & Wilkins, Inc.