Overview of Coupled Processes with Emphasis in Geochemistry

Langmuir, Donald

doi:10.1016/b978-0-12-701620-7.50011-8

Cited by 7 publications

(1 citation statement)

References 58 publications

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“…In this technical note we consider the relationship between mean aperture and effective transmissivity of rough‐walled (variable‐aperture) fractures during precipitation in gradient reaction regimes. For silica and quartz, whose solubility increases with temperature (below 340°C), precipitation will occur if the temperature decreases along a flow path, (e.g., in the far field region of a heat generating nuclear waste repository [ Langmuir , 1987]). For minerals whose solubility decreases with temperature, such as calcite, precipitation will occur if the temperature increases along a flow path [e.g., Bächler and Kohl , 2005].…”

Section: Introductionmentioning

confidence: 99%

Fracture alteration by precipitation resulting from thermal gradients: Upscaled mean aperture‐effective transmissivity relationship

Chaudhuri

Rajaram

Viswanathan

2012

Water Resources Research

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Precipitation and dissolution reactions in fractures alter apertures, which in turn affects their flow and transport properties. We consider aperture alteration by precipitation in a “gradient‐reaction” regime where fluids are close to chemical equilibrium with a mineral everywhere, but precipitation is driven by solubility gradients. Monte Carlo simulations on computer‐generated aperture fields suggest that the most important feature of fracture alteration by precipitation is the formation of elongated precipitate bodies perpendicular to the mean flow direction. The simulation results provide a basis for a proposed upscaling relationship between mean aperture and the effective transmissivity tensor, incorporating a critical aperture at which the transmissivity decreases steeply.

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Section: Introductionmentioning

confidence: 99%

Fracture alteration by precipitation resulting from thermal gradients: Upscaled mean aperture‐effective transmissivity relationship

Chaudhuri

Rajaram

Viswanathan

2012

Water Resources Research

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The geochemical environment

Herman

1989

Engineering Geology

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A summary of subsurface hydrological and hydrochemical models

Mangold¹,

Tsang²

1991

Reviews of Geophysics

148

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Numerical simulation in space and time is an established method in fluid flow and solute transport studies. Similarly, the modeling of equilibrium chemistry of aqueous systems has been well developed. Coupling hydrologic transport models and aqueous chemical models is being actively pursued by a number of research groups. To provide a review for researchers as well as field practitioners who may need to select and use models of varying degrees of complexity, summaries of 56 major numerical codes are made in comparative tables with selected references for three broad classes of codes: hydrologic transport models, geochemical models, and hydrochemical models that combine the chemical and transport models. Criteria for code selection and explanations as to how their characteristics were compiled are described. The governing equations for hydrologic flow, solute transport, and chemical relations are briefly described and discussed in light of the assumptions made by the different codes that employ them. Limitations of current modeling conceptualization and practice and areas of present active research effort are noted. Some comments are also given on model validation, a topic of current concern for modeling. Experience in model applications for each code and available information regarding its verification and validation are given in the appendix.

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Overview of Coupled Processes with Emphasis in Geochemistry

Cited by 7 publications

References 58 publications

Fracture alteration by precipitation resulting from thermal gradients: Upscaled mean aperture‐effective transmissivity relationship

Fracture alteration by precipitation resulting from thermal gradients: Upscaled mean aperture‐effective transmissivity relationship

The geochemical environment

A summary of subsurface hydrological and hydrochemical models

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