A novel conceptual model for the flow and transport in fractured rock

Veikko Taivassalo, Aimo Hautojärvi

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    In crystalline rock groundwater flows predominantly in fractures and fissures. Strongly varying fracture aperture guides the flow preferentially in some parts of a fracture plane, in so called channels. In our hydraulic model the degree of channeling together with the aperture variation along a channel is included as a factor which is the ratio of the aperture from transmissivity measurements and the aperture from the tracer tests.

    The developed transport model takes into account the coupling of molecular diffusion and advection in a velocity field varying linearly over a characteristic width. Various flow velocities in different parts of a channel cause a transient phase with non-Fickian behavior of dispersion. This might erroneously be attributed to other processes e.g. matrix diffusion when not taken into account in the migration modeling of tracers. Molecular diffusion across the flow field, however, tends to smooth out the transport time differences. With time the dispersion diminishes and becomes more symmetric in confined channels.

    The concept and models have been applied to predict and interpret field experiments aimed to investigate transport over long distances in highly conductive fracture zones. The analyzed experiments have been performed at the Finnsjön research area in Sweden and they belong to the test case 5 of the INTRAVAL project.
    Original languageEnglish
    Title of host publicationScientific Basis for Nuclear Waste Management XIV
    EditorsTeofilo A. Abrajano, L.H. Johnson
    Place of PublicationBoston
    PublisherMaterials Research Society
    Pages831-838
    ISBN (Print)978-1-55899-104-0
    DOIs
    Publication statusPublished - 1991
    MoE publication typeA4 Article in a conference publication
    EventScientific Basis for Nuclear Waste Management XIV - Boston, United States
    Duration: 26 Nov 199129 Nov 1991

    Publication series

    SeriesMaterials Research Society Symposia Proceedings
    Volume212
    ISSN0272-9172

    Conference

    ConferenceScientific Basis for Nuclear Waste Management XIV
    CountryUnited States
    CityBoston
    Period26/11/9129/11/91

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