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Review: The state-of-art of sparse channel models and their applicability to performance assessment of radioactive waste repositories in fractured crystalline formations
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. (Hydrogeology)
2016 (English)In: Hydrogeology Journal, ISSN 1431-2174, E-ISSN 1435-0157Article in journal (Refereed) Published
Abstract [en]

Laboratory and field experiments done on fractured rock show that flow and solute transport often occur along flow channels. ‘Sparse channels’ refers to the case where these channels are characterised by flow in long flow paths separated from each other by large spacings relative to the size of flow domain. A literature study is presented that brings together information useful to assess whether a sparse-channel network concept is an appropriate representation of the flow system in tight fractured rock of low transmissivity, such as that around a nuclear waste repository in deep crystalline rocks. A number of observations are made in this review. First, conventional fracture network models may lead to inaccurate results for flow and solute transport in tight fractured rocks. Secondly, a flow dimension of 1, as determined by the analysis of pressure data in well testing, may be indicative of channelised flow, but such interpretation is not unique or definitive. Thirdly, in sparse channels, the percolation may be more influenced by the fracture shape than the fracture size and orientation but further studies are needed. Fourthly, the migration of radionuclides from a waste canister in a repository to the biosphere may be strongly influenced by the type of model used (e.g. discrete fracture network, channel model). Fifthly, the determination of appropriateness of representing an in situ flow system by a sparse-channel network model needs parameters usually neglected in site characterisation, such as the density of channels or fracture intersections.

Place, publisher, year, edition, pages
2016.
Keyword [en]
Crystalline rocks, Solute transport, Channelised flow, Sparse channels, Flow dimension
National Category
Geosciences, Multidisciplinary
Research subject
Hydrology
Identifiers
URN: urn:nbn:se:uu:diva-293596DOI: 10.1007/s10040-016-1415-xOAI: oai:DiVA.org:uu-293596DiVA: diva2:928023
Funder
Swedish Radiation Safety Authority
Available from: 2016-05-13 Created: 2016-05-13 Last updated: 2016-06-28Bibliographically approved

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The full text will be freely available from 2017-05-03 12:00
Available from 2017-05-03 12:00

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