Three-Dimensional Modeling of Contaminant Transport in Subsurface Soil Media Using UFV Approach
Publication: International Journal of Geomechanics
Volume 20, Issue 4
Abstract
In this study, an upwind finite-volume (UFV) scheme was used to solve a three-dimensional contaminant transport model in order to investigate contaminant movement within a clay deposit beneath and around 10-year operation of an uncontrolled municipal solid waste (MSW) landfill site in Hamedan, Iran. Concentrations of , , , and total organic carbon (TOC) in pore water soil samples collected up to a 5-m depth were analyzed. The governing equation describing the fate and transport of a dissolved contaminant included advection, dispersion, and diffusion processes, as well as geochemical reaction and first-order decay of chemicals. A special domain decomposition method for solving the transport equation in porous media was implemented to efficiently reduce the computational time of the simulation. The field profiles for , , and were compared with the simulated profiles generated using the proposed methodology. After calibration of the developed model, values for advective velocities, dispersivity, effective diffusion coefficient, and retardation factor of the ionic species for these till deposits were obtained. The results showed that after a 10-year period of operation, percolated to a depth greater than 4 m below the ground level. Advection and mechanical dispersion are the dominant transport mechanisms for shallow depths of the till.
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Acknowledgments
The authors are grateful to Hamedan Regional Water Authority for their cooperation in providing required data and documents. We also thank the reviewers for their helpful suggestions and corrections.
References
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Information & Authors
Information
Published In
International Journal of Geomechanics
Volume 20 • Issue 4 • April 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Aug 30, 2018
Accepted: Sep 12, 2019
Published online: Feb 11, 2020
Published in print: Apr 1, 2020
Discussion open until: Jul 11, 2020
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