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Abstract: The
characterization of DNAPL source zones provides important information for evaluating
cost-effective remediation schemes at contaminated sites. In this work, numerical
simulations were conducted to investigate the influence of: the capillary
pressure-saturation parameters; residual organic saturation; spill rate; hypothetical
field structure; and dimensionality on the DNAPL ... read moremigration and entrapment simulation in
a highly heterogeneous aquifer. The results indicate that, in highly heterogeneous
aquifers, the determination of capillary pressure-saturation parameters has a critical
influence on the modeling of the DNAPL migration, while the residual organic saturation
has almost no influence on DNAPL distributions. The spill rate strongly affects the
DNAPL spread. The location of low permeability layers has critical consequences on the
prediction of the vertical migration. The maximum organic saturation and pool fraction
for highly heterogeneous aquifers are higher than those for mildly heterogeneous
aquifers. The feasibility of using 2-D simulation results to predict 3-D simulation
trends needs additional work.
Thesis (M.S.)--Tufts
University, 2013.
Submitted to the Dept. of Civil
Engineering.
Advisors: Linda Abriola, and Itza
Mendoza-Sanchez.
Committee: Eric
Miller.
Keywords: Environmental engineering,
Environmental geology, and Environmental studies.read less
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