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Abstract: The release
of chlorinated contaminants sequestered in low-permeability strata is emerging as a
critical challenge to site management, limiting remediation performance and sustaining
plume longevity. An adapted version of MT3DMS, linked to MODFLOW, is used to simulate
the coupled effect of sorption and back diffusion on plume tailing using an ensemble of
two-dimensional realizations ... read moreof a highly heterogeneous formation and corresponding DNAPL
(dense nonaqueous phase liquid) source distributions. The simulation results indicate
that appropriate representation of sorption processes is important for accurate
prediction of plume longevity, especially once the DNAPL has been completely dissolved.
The mean of the near-source plume sustained by linear sorption-controlled back diffusion
is 19 years beyond DNAPL depletion, representing 6% of total plume longevity. The plumes
are even more prolonged for cases with nonlinear sorption and rate-limited sorption,
which are determined to be 2.7 and 3.5 times longer than the linear sorption case. A
limited effect of sorption on NAPL dissolution is also
observed.
Thesis (M.S.)--Tufts University,
2015.
Submitted to the Dept. of Civil
Engineering.
Advisor: Linda
Abriola.
Committee: Kurt Pennell, and Grant
Garven.
Keywords: Environmental engineering,
Hydrologic sciences, and Environmental management.read less
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