Mapping ice-bonded permafrost with electrical methods in Sisimiut, West Greenland

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Abstract

Permafrost delineation and thickness determination is of great importance in engineering related projects in arctic areas. In this paper, 2D geoelectrical measurements are applied and evaluated for permafrost mapping in an area in West Greenland. Multi-electrode resistivity profiles (MEP) have been collected and are compared with borehole information. It is shown that the permafrost thickness in this case is grossly overestimated by a factor of two to three. The difference between the inverted 2D resistivity sections and the borehole information is explained by macro-anisotropy due to the presence of horizontal ice-lenses in the frozen clay deposits. It is concluded that where the resistivity method perform well for lateral permafrost mapping, great care should be taken in evaluating permafrost thickness based on 2D resistivity profiles alone. Additional information from boreholes or other geophysical techniques is needed for correct interpretation.
Original languageEnglish
Title of host publicationNear Surface 2006 : Extended Abstracts
PublisherEAGE Publications BV
Publication date2006
ISBN (Print)90-73781-62-0
Publication statusPublished - 2006
Event12th European Meeting of Environmental and Engineering Geophysics - Helsinki, Finland
Duration: 4 Sep 20066 Sep 2006
Conference number: 12

Conference

Conference12th European Meeting of Environmental and Engineering Geophysics
Number12
CountryFinland
CityHelsinki
Period04/09/200606/09/2006

Cite this

Ingeman-Nielsen, T. (2006). Mapping ice-bonded permafrost with electrical methods in Sisimiut, West Greenland. In Near Surface 2006: Extended Abstracts EAGE Publications BV.