Comparison of Microscopic and Macroscopic Modeling Approaches for Subsurface Contaminant Transport |
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Authors: | Amvrossios C Bagtzoglou Daehyun Kim |
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Affiliation: | (1) Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT 06269-2037, USA;(2) Department of Earth and Environmental Engineering, Columbia University, New York, NY 10027, USA |
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Abstract: | The practice of contaminant transport and remediation has shown significant progress in recent years. However, despite the
significant progress made, remediation efforts are often delayed by extremely long breakthrough curve tails that render efforts
to bring the level of contaminants below the regulatory standards inefficient. One hypothesis is that these long tails are
due to the reservoir-like slow diffusive processes in soil micropore zones. This study compares the effects of micropores
at macroscopic and microscopic levels and establishes a link between these approaches for validation and calibration purposes.
The link between macroscopic and microscopic levels is established through comparisons and testing of the two models while
incorporating appropriate scale and boundary effects. Despite the differences in conceptual approaches and simulation time,
the two approaches rendered meaningful results. The link helps forecast the effects of micropore zone transport processes
in the subsurface efficiently and thus allows development of numerical tools that could contribute towards more efficient
remediation design. |
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Keywords: | Contaminant transport Micropores Navier– Stokes Numerical modeling Particle tracking Random walk Remediation |
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