Evaluation of the applicability of the dual-domain mass transfer model in porous media containing connected high-conductivity channels

Liu, G.; Zheng, C.; Gorelick, S. M.

Abstract:

This paper evaluates the dual-domain mass transfer (DDMT) model to represent transport processes when small-scale high-conductivity (K) preferential flow paths (PFPs) are present in a homogenous porous media matrix. The effects of PFPs upon solute transport were examined through detailed numerical experiments involving different realizations of PFP networks, PFP/matrix conductivity contrasts varying from 10:1 to 200:1, different magnitudes of effective conductivities, and a range of molecular diffusion coefficients. Results suggest that the DDMT model can reproduce both the near-source peak and the downstream low-concentration spreading observed in the embedded dendritic network when there are large conductivity contrasts between high-K PFPs and the low-K matrix. The accuracy of the DDMT model is also affected by the geometry of PFP networks and by the relative significance of the diffusion process in the network-matrix system. Copyright 2007 by the American Geophysical Union.

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Article

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70031599

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Liu, G.; Zheng, C.; Gorelick, S. M.

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English

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Water Resources Research

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Evaluation of the applicability of the dual-domain mass transfer model in porous media containing connected high-conductivity channels; 2007; Article; Journal; Water Resources Research; Liu, G.; Zheng, C.; Gorelick, S. M.