Numerical simulations of groundwater flow and chemical transport through
three-dimensional heterogeneous porous media are described. The authors employ two
CRAY supercomputers for different parts of the decoupled calculation: the flow field
is computed on the T3D massively parallel computer, and the contaminant migration is
simulated on the C90 vector supercomputer. The authors compare simulation results
for subsurface models based on homogeneous and heterogeneous conceptual models and
find that the heterogeneities have a profound impact on the character of contaminant migration.
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