Results from a 10 year AEM mapping programme of buried tunnel valleys in Denmark

Flemming Jørgensen, Peter B.E. Sandersen

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


    Extensive mapping with airborne EM has since 2003 revealed intricate patterns of buried tunnel valleys in the Danish subsurface. Several generations of cross-cutting valleys are found making up a highly complicated geological setting. The valleys play a vital role for the Danish water supply because they are assumed to host about 50 % of all extractable groundwater, but they are also important because they impose a significant impact on groundwater flow. Especially three properties of the valleys are essential to map: 1) their spatial extent, 2) their internal architecture, and 3) the lithology of the infill and surrounding environment. Borehole data constitute an insufficient basis for 1) and 2). Instead, techniques like the airborne SkyTEM system providing 3D data are required. Almost 20.000 km2 have been mapped with the TEM method resulting in more than 5000 km mapped buried valleys. With the SkyTEM system full information about the spatial extent of the valleys (1) can normally be achieved, but also information about the internal architecture (2) and lithology (3) is obtained to some extent. Collection of seismic data and borehole data provide supplementary information about (2) and (3) at selected sites.

    Original languageEnglish
    Title of host publication2nd International Conference on Engineering Geophysics 2013
    PublisherEuropean Association of Geoscientists and Engineers
    Number of pages6
    ISBN (Electronic)978-90-73834-66-8
    ISBN (Print)978-1-5108-2830-8
    Publication statusPublished - 2013
    Event2nd International Conference on Engineering Geophysics - Al Ain, United Arab Emirates
    Duration: 23 Nov 201327 Nov 2013


    Conference2nd International Conference on Engineering Geophysics
    Country/TerritoryUnited Arab Emirates
    CityAl Ain

    Programme Area

    • Programme Area 2: Water Resources


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