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Principles and Practice of Reactive Transport Modeling

Published online by Cambridge University Press:  15 February 2011

Peter C Lichtner
Peter C Lichtner*
Affiliation:
Center for Nuclear Waste Regulatory AnalysesSouthwest Research Institute, 6220 Culebra Road, San Antonio, Texas, 78238–5166
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Abstract

This paper presents a review of the principles underlying a continuum formulation of reactive transport in a porous medium. Partial differential equations representing conservation of mass are derived for transport by advection, diffusion, and electrochemical migration combined with chemical reaction of aqueous species and solids. Several examples are presented to illustrate the general theory. These include weathering along a narrow crevice, electrochemical migration in a dilute NaCl solution, secondary pyrite formation mediated through intermediate sulfur oxidation states, and a description of a uranium roll-front deposit. Numerical techniques which take advantage of the quasi-stationary state approximation, based on the much longer time scale involved in mineral alteration compared to that characterizing changes in the aqueous phase, permit solving the reactive transport equations over geologic time scales.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 353: Symposium – Scientific Basis for Nuclear Waste Management XVIII , 1994 , 117
Copyright
Copyright © Materials Research Society 1995

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References

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