Journal Article

FZJ-2019-00189

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Transport of oxygen into granitic rocks: Role of physical and mineralogical heterogeneity

Trinchero, P. (Corresponding author) ; Sidborn, M. ; Puigdomenech, I. ; Svensson, U. ; Ebrahimi, H. ; Molinero, J. ; Gylling, B. ; Bosbach, D.FZJ* ; Deissmann, G.FZJ*

2019
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/21172  doi:10.1016/j.jconhyd.2018.12.001

Abstract: The rock matrix of granites is expected to be an important buffer against the dispersion of contaminants, e.g. radionuclides, and against the ingress of oxygenated glacial meltwater. The influence of matrix heterogeneity onO2 diffusive transport is assessed here by means of numerical experiments based on a micro-Discrete Fracture Network (micro-DFN) representation of the diffusion-available pore space along with random realisations ofidealized biotite grains, to simulate the heterogeneous nature of granitic rocks. A homogeneous-based analytical solution is also presented and used to assess possible deviations of the numerical experiments from the assumptionof homogeneity. The analytical solution is also used to test upscaled values of mineral surface area. The numerical experiments show that the matrix behaves as a composite system, with the coexistence of fast andslow diffusive pathways. This behavior is more evident at low Damköhler numbers. Our interpretation of the numerical experiments points out the importance to properly characterise the heterogeneity of the rock matrix.

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Contributing Institute(s):

1. Nukleare Entsorgung und Reaktorsicherheit (IEK-6)
2. JARA - HPC (JARA-HPC)

Research Program(s):

1. 161 - Nuclear Waste Management (POF3-161) (POF3-161)
2. Understanding coupled reactive transport in fractured crystalline rocks at sub-millimeter scale (jiek63_20141101) (jiek63_20141101)

Appears in the scientific report 2019

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Database coverage:
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