Transport of Reactive Solutes through Multilayered Soils
1977
Selim, H. M. | Davidson, J. M. | Rao, P. S. C.
Solute transport through saturated and unsaturated multilayed soils was studied using laboratory experiments and finite difference approximations of the solute transport equation. Soil-water and physical characteristics as well as solute sorption properties were measured and/or calculated for each soil layer. Linear and nonlinear equilibrium and kinetic adsorption processes were used to predict adsorption in each layer. Water flux was assumed constant for water-saturated and unsaturated layered soil profiles. For all adsorption processes considered, the calculated results showed that the order in which the soil layers were stratified in a water-saturated profile did not influence the effluent solute concentration distribution. For unsaturated layered soil profiles, the results showed that effluent solute distributions can be predicted with an average water content within individual soil layers. Experimental results from the miscible displacement of ³⁶Cl and ¹⁴C-labeled 2,4-D [(2,4-dichlorophenoxy) acetic acid], through a two-layered soil column (Norge loam and Eustis sand) supported the calculated results.
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