. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. Hydrodynamic dispersion is the spreading which occurs both perpendicular to and in the direction of groundwater flow, of a water-soluble substance that is transported with the groundwater. The transit velocity of specific water-soluble substances may be higher or lower than the average groundwater velocity. Hydrody- namic dispersion is dependent on the velocity distribution in the medium and on molecular diffusion.
. Hydrochemical, vegetational and microbiological effects of a natural and a constructed wetland on the control of acid mine drainage . Mine drainage; Acid mine drainage; Wetlands. Hydrodynamic dispersion is the spreading which occurs both perpendicular to and in the direction of groundwater flow, of a water-soluble substance that is transported with the groundwater. The transit velocity of specific water-soluble substances may be higher or lower than the average groundwater velocity. Hydrody- namic dispersion is dependent on the velocity distribution in the medium and on molecular diffusion. Bear (1972) gives a quite detailed evaluation of hydrodynamic dispersion. Dispersion of a solute requires groundwater flow in a medium with a system of pores or channels. An example of hydrodynamic dispersion which is caused by unequal velocities of the ground water is shown in Figure 5-3. Tracer particles released at the same time and carried by the groundwater have different flow paths. This results in a more widespread distribution of tracer particles with time. General direction of water motion. W Initial position ^ Position after one. hour [(£))) Position-ofter two hours INITIAL -DISTRIBUTION OF PARTICLES OISTRISUTION OF .PARTICLES AFTER /ONE HOUR DISTRIBUTION OF PARTICLES AFTER TWO HOURS DISTANCE Figure 5-3. One dimensional example of hydrodynamic dispersion for tracer particles A - G (from Davis et al. 1985). 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Montana State University (Bozeman, Mont. ). Reclamation Research Unit; Dollhopf, D. J; MSI Detoxification, Inc. [Bozeman, Mont. ? : Montana State Univ. ?]
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