Abstract
Most of the mathematical models used to describe the transport of contaminants in aquifers are based on convection-dispersion equation (CDE) in which transport coefficients are uniform constants. The “classical” CDE, however, fails to describe solute transport in heterogeneous aquifers where hydraulic properties (such as hydraulic conductivity and porosity) of the media exhibit a wide distribution in space. Experiments on solute transport under such conditions have shown that field data on dispersion coefficients are not uniform constants and can increase with the scale of field experiments [Fried, 1975; Schwydler, 1985; Pickens and Grisak, 1981a, 1981b; Bochever and Oradovskay, 1972; Mironenko and Rumynin, 1986].
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