Modeling of Density-Dependent Flow and Transport in Anisotropic Aquifers: An Example Site of Landfill

In advection-dispersion transport processes, the density contrast between the contaminant fluid and the groundwater in the surrounding flow domain can affect the groundwater flow. Under such circumstances, the migration patterns and concentration distributions, of contaminant plumes can be changed. The primary purpose of this research is to simulate the problems of density-dependent groundwater flow and transport in homogeneous, anisotropic and inhomogeneous (or heterogeneous), anisotropic aquifers by means of a Galerkin finite element method. Secondly, this research is to show the numerical model of Galeati et al. (1992) can be applied to a landfill site. The leachate from a landfill site into the groundwater can change the contaminant concentration. Thus, there exists a density contrast between the contaminant fluid and the groundwater in the surrounding flow domain. In simulation, an example site of landfill is demonstrated. The results for contaminant sources from a landfill conclude as follows. If there does not exist a significant density contrast, the contaminant plume will spread in a shallow zone close to the water table; on the other hand, if there is such a contrast, the plume will sink downward into the groundwater flow system, and its migration pattern will only be changed after a longer transport time of six years. In a shorter time (one to three years), however, the migration pattern will not be significantly changed.

並列關鍵字

Density-depenent flow and transport ； Modeling ； Landfill

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