A Mathematical Model of the Vertical Transport and Fate of Toxic Chemicals in a Simple Aquifer

Résumé du livre

Adsorption, dispersion and changes in moisture content control the rate of transport of solutes in an unsaturated soil column. A one-dimensional mathematical model has been developed to examine the simultaneous transport of heat, moisture and chemical mass in unsaturated soils. Vertical temperature, moisture content and chemical concentration profiles were determined using the line successive over relaxation (LSOR) procedure on implicit backward difference approximations to the defining set of non-linear partial differential equations. For a specified set of hydraulic properties, initial distributions of chemical in the soil column and external weather conditions, chemical concentration profiles for 100 day simulations illustrated the influence of the combined effects of adsorption and dispersion on chemical transport in unsaturated soils.