Abstract
An evaluation of the dispersion coefficient or the dispersivity is important for the solute transport in groundwater flow. In this paper, an evaluation of the dispersion coefficient by the numerical simulation for the non-uniform porous media is attempted. The non-uniform porous media is consisted of 39×19 blocks with the packed glass beads of six different diameters. For each block, microscopic dispersivity, permeability and porosity are known. The forty cases for evaluating the macroscopic dispersion are studied. Specifically, the relations between the integral scale of the log permeability and macroscopic dispersivity is examined. It is suggested that the macroscopic dispersion depends on the integral scale and that the sufficient observation scale is necessary for obtaining the macroscopic dispersion coefficient.
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