On the importance of diffusion and compound-specific mixing for groundwater transport: An investigation from pore to field scale

Rolle, Massimo; Chiogna, Gabriele; Hochstetler, David L.; Kitanidis, Peter K.

doi:10.1016/j.jconhyd.2013.07.006

Cited by 92 publications

(66 citation statements)

References 82 publications

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“…It is important to notice that, even if the molecular diffusion D m is a scalar, the macroscopic effective molecular diffusion D 0 can become a tensor when the porous medium is not perfectly isotropic. The effect of the system's heterogeneity on particle transport and the importance of diffusive processes occurring at the scale of the pores were noted in several works [9,10]. In general all these coefficients depend on the porosity of the porous medium, , on the tortuosity (i.e., a coefficient, τ , or a tensor, τ , that takes into account the geometrical complexity of the medium) and on the Péclet number of the flow (which will be defined later).…”

Section: Introductionmentioning

confidence: 99%

Pore-scale simulation of fluid flow and solute dispersion in three-dimensional porous media

et al. 2014

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Pore-scale simulation of fluid flow and solute dispersion in three-dimensional porous media In the present work fluid flow and solute transport through porous media are described by solving the governing equations at the pore scale with finite-volume discretization. Instead of solving the simplified Stokes equation (very often employed in this context) the full Navier-Stokes equation is used here. The realistic three-dimensional porous medium is created in this work by packing together, with standard ballistic physics, irregular and polydisperse objects. Emphasis is placed on numerical issues related to mesh generation and spatial discretization, which play an important role in determining the final accuracy of the finite-volume scheme and are often overlooked. The simulations performed are then analyzed in terms of velocity distributions and dispersion rates in a wider range of operating conditions, when compared with other works carried out by solving the Stokes equation. Results show that dispersion within the analyzed porous medium is adequately described by classical power laws obtained by analytic homogenization. Eventually the validity of Fickian diffusion to treat dispersion in porous media is also assessed. KAUST Repository

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Section: Introductionmentioning

confidence: 99%

Pore-scale simulation of fluid flow and solute dispersion in three-dimensional porous media

et al. 2014

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“…Further work should address (i) the use of 3D analogs, where twisting flow paths enhance dilution (Stauffer, 2007) and reactive mixing, to confirm that CSIA-based approaches for in situ biodegradation estimates are unreliable in heterogeneous aquifers, and to identify the magnitude of over-and underestimation under those more complex conditions and (ii) effects of compound-specific diffusion and mixing as recently demonstrated for strongly advection-dominated flow regimes by Rolle et al (2013).…”

Section: Resultsmentioning

confidence: 96%

Evolution of carbon isotope signatures during reactive transport of hydrocarbons in heterogeneous aquifers

Höyng

Prommer

Blum

et al. 2015

Journal of Contaminant Hydrology

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“…The distinctive aspect of investigating flow and transport in porous media is the complex interplay between processes occurring at multiple spatial scales (Rolle et al 2013;Hyman and Winter 2013). It has recently been shown that Stokes flow, which describes flow within individual pores, can cause chaotic advection if the pore geometry is sufficiently complex.…”

Section: Flow In Porous Mediamentioning

confidence: 99%

Helical Flow and Transient Solute Dilution in Porous Media

2015

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Artículo de publicación ISIHelical flow can occur in porous media if the hydraulic conductivity tensor is anisotropic.We study the structure of steady-state flowfields in three-dimensional anisotropic porous media formed by two homogeneous layers, one of which is anisotropic.We simulate transient transport of a conservative scalar in such flowfields by a hybrid streamline/smoothed particle hydrodynamics method and analyze dilution. We use stretching and folding metrics to characterize the flow field and the dilution index of a conservative scalar divided by the volume of the domain to quantify plume dilution. Based on the results of detailed numerical simulations, we conclude that nonlinear deformation triggers dilution and that plume dilution is controlled by two parameters: the contrast between the principal directions of the anisotropic layer, and the orientation of the hydraulic conductivity tensor with respect to the main flow direction. Furthermore, we show that in this kind of flow fields transverse dispersion is responsible for an increase in plume dilution, while the effect of longitudinal dispersion is negligible.DFG (Deutsche Forschungsgemeinschaft) CI-26/11 - 1 Conicyt Chile through Fondecyt Project 11110228 Fondap Project 1509001

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On the importance of diffusion and compound-specific mixing for groundwater transport: An investigation from pore to field scale

Cited by 92 publications

References 82 publications

Pore-scale simulation of fluid flow and solute dispersion in three-dimensional porous media

Pore-scale simulation of fluid flow and solute dispersion in three-dimensional porous media

Evolution of carbon isotope signatures during reactive transport of hydrocarbons in heterogeneous aquifers

Helical Flow and Transient Solute Dilution in Porous Media

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