Model for Consolidation-Induced Solute Transport with Nonlinear and Nonequilibrium Sorption
Publication: International Journal of Geomechanics
Volume 8, Issue 3
Abstract
A numerical model, called CST2, is presented for coupled large strain consolidation and solute transport in saturated porous media. The consolidation and solute transport algorithms include the capabilities of a previous model, CST1, with the addition of a variable effective diffusion coefficient during consolidation and nonlinear nonequilibrium sorption. The model is based on a dual-Lagrangian framework that tracks separately the motions of fluid and solid phases. Verification checks of CST2 show excellent agreement with analytical and numerical solutions for solute transport in rigid porous media. A parametric study illustrates that, for the test cases considered, variation of effective diffusion coefficient during consolidation has an important effect on solute transport, whereas nonlinearity of the sorption isotherm has a less important effect. Additional simulations show that nonequilibrium sorption can have a strong effect on consolidation-induced solute transport and that this effect becomes more important as the rate of consolidation increases. The simulations also corroborate previous findings that consolidation can have a lasting effect on solute migration because transient advective flows change the distribution of solute mass which then becomes the initial condition for subsequent transport processes.
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Acknowledgments
Financial support for this investigation was provided by the U.S. National Oceanic and Atmospheric Administration through the Ohio Sea Grant College Program. This support is gratefully acknowledged. The writers also thank Dr. John J. Lenhart, Assistant Professor in the Department of Civil & Environmental Engineering & Geodetic Science at The Ohio State University, for several discussions regarding nonlinear and nonequilibrium sorption in rigid porous media.
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Information
Published In
International Journal of Geomechanics
Volume 8 • Issue 3 • May 2008
Pages: 188 - 198
Copyright
© 2008 ASCE.
History
Received: Apr 11, 2007
Accepted: Aug 28, 2007
Published online: May 1, 2008
Published in print: May 2008
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