Detailed 3D geological modelling at a contaminated stream using geophysical, geological and chemical data-A challenge

I. Moeller, P.K. Maurya, G. Fiandaca, N. Balbarini, V. Rønde, A.J. Kallesøe

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

    Abstract

    Localizing sources of contaminated groundwater discharging to streams may be a challenging task. A detailed geological model of the site is required for simulating the groundwater flow and the contaminant transport, in addition to chemical and hydrological investigations. In the town of Grindsted, Denmark, contaminated groundwater discharges to a stream. Several contaminated sites are present in the area, where chemical waste from a nearby chemical factory was deposited. In order to understand the hydrological flow and transport of contaminants controlled by a few mostly continuous clay and lignite layers in an otherwise sandy environment, a detailed 3D geological model is constructed. The model integrates all available data including DCIP and EMI surveys, lithological logs from new and existing wells, hydraulic head and pore water electric conductivity data. This study addresses the challenges met while constructing the 3D geological model in an area, where inorganic contaminants are highly affecting the geophysical data. The model ambiguities related to interpretation of clay layers versus contaminated sand layers in the DCIP resistivity sections as well as resistivity/chargeability-thickness equivalences are managed by integrated interpretation of a large amount of different geophysical, geological, hydraulic and chemical data.

    Original languageEnglish
    Title of host publication23rd European Meeting of Environmental and Engineering Geophysics 2017
    Place of PublicationHouten, Netherlands
    PublisherEuropean Association of Geoscientists and Engineers
    Pages197-201
    Number of pages5
    ISBN (Electronic)978-9-4628-2223-8
    ISBN (Print)978-1-5108-5079-8
    DOIs
    Publication statusPublished - 2017
    Event23rd European Meeting of Environmental and Engineering Geophysics - Malmo, Sweden
    Duration: 3 Sept 20177 Sept 2017

    Conference

    Conference23rd European Meeting of Environmental and Engineering Geophysics
    Country/TerritorySweden
    CityMalmo
    Period3/09/177/09/17

    Programme Area

    • Programme Area 2: Water Resources

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