A recent paper (Savant et al. , 1985) observed that the pressure variations on the typically uneven bottom surface of a river can lead to significant convective motions in the porous sediment. Based on the preliminary laboratory and numerical simulations described in that paper, contaminant transport in the sediment was expected to be dominated by this convective mechanism. As a follow-up to the preliminary experiments, detailed numerical modeling of the convective motions and the resulting contaminant transport were undertaken. The current paper summarizes the progress to date. Detailed modeling of the flow was accomplished via boundary element methods. A novel procedure for tracing flow streamlines and equipotential surfaces was developed and implemented to take full advantage of the unique characteristics of boundary element techniques. The effects of medium inhomogeneity were also investigated via boundary element techniques. Also, contaminant transport as a result of the flow was modeled using both Lagrangian and Eulerian approaches.
|Number of pages||4|
|Journal||National Meeting - American Chemical Society, Division of Environmental Chemistry|
|State||Published - 1986|