Analysis of the migration of nonsorbing tracers in a natural fracture in granite using a variable aperture channel model

Park, Chung-Kyun; Vandergraaf, T. T.; Drew, D. J.; Hahn, Pil-Soo

doi:10.1016/s0169-7722(96)00061-7

Cited by 25 publications

(10 citation statements)

References 10 publications

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“…A two-dimensional random-walk particle tracking algorithm was used to simulate the solute transport through the flow fields [11,17,25]. Four kinds of transport processes were considered: advection and longitudinal dispersion in the water conducting fracture, diffusion into the rock mass, and sorption onto the rock surface.…”

Section: Modeling the Solute Transportmentioning

confidence: 99%

Preliminary Modeling for Solute Transport in a Fractured Zone at the Korea Underground Research Tunnel (Kurt)

Park¹,

Lee²,

Baik³

et al. 2012

Nuclear Engineering and Technology

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Section: Modeling the Solute Transportmentioning

confidence: 99%

Preliminary Modeling for Solute Transport in a Fractured Zone at the Korea Underground Research Tunnel (Kurt)

Park¹,

Lee²,

Baik³

et al. 2012

Nuclear Engineering and Technology

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“…The relative order of magnitude of these two effects is characterized by the Péclet number : Pe = Ua/D m (D m is the molecular diffusion coefficient; a is a characteristic length of the medium (here the mean fracture aperture). Recent experimental studies of breakthrough curves of solutes in natural fractures [4,5,6,7] measured dispersion coefficients increasing linearly with the mean flow U (or with Pe). Moreover, the value of the dispersivity l d = D/U observed agreed with the predictions of a perturbation analysis [8].…”

Section: Introductionmentioning

confidence: 99%

Miscible transfer of solute in different model fractures: From random to multiscale wall roughness

Auradou¹,

Boschan²,

Chertcoff³

et al. 2009

Comptes Rendus. Géoscience

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Miscible tracer dispersion measurements in transparent model fractures with different types of wall roughness are reported. The nature (Fickian or not) of dispersion is determined by studying variations of the mixing front as a function of the traveled distance but also as a function of the lateral scale over which the tracer concentration is averaged. The dominant convective dispersion mechanisms (velocity profile in the gap, velocity variations in the fracture plane) are established by comparing measurements using Newtonian and shear thinning fluids. For small monodisperse rugosities, front spreading is diffusive with a dominant geometrical dispersion (dispersion coefficient D ∝ Pe) at low Péclet numbers Pe; at higher Pe values one has either D ∝ Pe 2 (i.e. Taylor dispersion) for obstacles of height smaller than the gap or D ∝ Pe 1.35 for obstacles bridging the gap. For a self affine multiscale roughness like in actual rocks and a relative shear displacement δ of complementary walls, the aperture field is channelized in the direction perpendicular to δ. For a mean velocity U parallel to the channels, the global front geometry reflects the velocity contrast between them and is predicted from the aperture field. For U perpendicular to the channels, global front spreading is much reduced. Local spreading of the front thickness remains mostly controlled by Taylor dispersion except in the case of a very strong channelization parallel to U.

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“…Therefore, the main efforts are focused on the study and modeling of migration and accumulation of radionuclides in discrete fracture systems (Nordqvist et al, 1996;Park et al, 1997). In the conceptual setting of the problem and modeling calculations, the mass transfer in the matrix that adjoins fluid-conducting fractures and in the host low-porosity medium is commonly regarded as an auxiliary event.…”

Section: Introductionmentioning

confidence: 99%

Tectonodynamics of fluid-conducting structural elements and migration of radionuclides in massifs of crystalline rocks

Петров¹,

Lespinasse²,

Hammer³

2008

Geol. Ore Deposits

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The principal aspects of reconstruction of conditions and paths of fluid migration in massifs of crystalline rocks are considered. The spatiotemporal relationships between stress fields, brittle failure, and migration of radionuclides are discussed. The main attention is focused on the staged character of tectonic events, fluid circulation conditions, and the sequence of uranium mineral formation as determined with structural, geological, tectonophysical, petrophysical, petrographic, mineralogical and geochemical, microstructural, microthermometric, and radiographic methods. As is exemplified in uranium deposits and massifs of silicic igneous rocks, the comprehensive consideration of the tectonodynamics of fluid-conducting structural elements and radionuclide migration is necessary for providing insights into the localization and redistribution of uranium, the PT conditions of uranium ore formation, and the forecast for long-term safety of disposal of radioactive wastes in crystalline rocks.

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Analysis of the migration of nonsorbing tracers in a natural fracture in granite using a variable aperture channel model

Cited by 25 publications

References 10 publications

Preliminary Modeling for Solute Transport in a Fractured Zone at the Korea Underground Research Tunnel (Kurt)

Preliminary Modeling for Solute Transport in a Fractured Zone at the Korea Underground Research Tunnel (Kurt)

Miscible transfer of solute in different model fractures: From random to multiscale wall roughness

Tectonodynamics of fluid-conducting structural elements and migration of radionuclides in massifs of crystalline rocks

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