Abstract
This paper describes the development and multistep validation of a one-dimensional, large strain consolidation coupled contaminant transport model with nonlinear and nonequilibrium sorption kinetics. The RCM-XPORT2K model uses the CS2 large strain consolidation approach for modeling the deforming saturated porous medium consolidating under a surcharge stress, coupled with reactive advective/dispersive solute transport through the medium, capped with a thin-layered reactive sequestering geocomposite known as a reactive core mat (RCM). In addition to assumptions made in previously developed, one-dimensional consolidation coupled contaminant transport model RCM-XPORT2, the RCM-XPORT2K model accounts for sediment- and sorbent-specific sorption kinetics to model nonlinear, and nonequilibrium sorption behavior. Validation of the model is presented by simulating: (1) sorption kinetics tests performed on sediment sampled from Neponset River, Milton, Massachusetts, USA and a commercial product, CETCO Organoclay PM-199; (2) solute transport from the large strain consolidation coupled contaminant transport tests with and using a high water content inert silt sample (New York Silt); and (3) the naphthalene transport and breakthrough times observed in upflow column tests with Neponset River sediment with various overlying cap layers.
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Acknowledgments
The work described in this paper is supported by the National Institute of Environmental Health Sciences (NIEHS) under Grant No. R01ES16205. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the NIEHS. The authors also acknowledge Prof. Patrick J. Fox for permission to use the CS2 model as a departure point in this study, and the efforts of Derek J. Yu and Brian Franklin, undergraduates at Northeastern University, who conducted the design and oversaw initial fabrication of the mesocosm column device, and assisted with the experimental phase.
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Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 8 • August 2017
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©2017 American Society of Civil Engineers.
History
Received: Mar 31, 2016
Accepted: Sep 26, 2016
Published online: Mar 17, 2017
Published in print: Aug 1, 2017
Discussion open until: Aug 17, 2017
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