Anion Exclusion and Coupling Effects in Nonsteady Transport Through Unsaturated Soils: II. Laboratory and Numerical Experiments
1974
Bresler, E. | Laufer, A.
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.
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