Imaging buried Quaternary valleys using the transient electromagnetic method

Flemming Jørgensen, Peter B.E. Sandersen, Esben Auken

Publikation: Bidrag til tidsskriftArtikelForskningpeer review

92 Citationer (Scopus)

Abstrakt

Buried Quaternary valleys in Denmark are complex structures filled with various deposits consisting primarily of glacio-lacustrine clay, till and meltwater sand, and gravel. The valleys are important geophysical targets, because they often contain significant volumes of groundwater used for public water supply. About 700 km of buried valley structures have been imaged in the western part of Denmark by the transient electromagnetic (TEM) method. The ability to map the valleys depends primarily on valley geometry, infill architecture and the resistivity of the fill sediments as well as the substratum. One-dimensional (1-D) inversion models of the TEM soundings have been used to construct contour maps of 20 m average resistivities and depth to a good conductor, which provide images for geological interpretation. Images of buried valley morphology, fill properties, infill architecture, such as cut-and-fill structures, valley distribution and valley generations, are characterized for case studies from Hornsyld, Holstebro and the Vonsild/Agtrup areas of Denmark.

OriginalsprogEngelsk
Sider (fra-til)199-213
Antal sider15
TidsskriftJournal of Applied Geophysics
Vol/bind53
Udgave nummer4
DOI
StatusUdgivet - okt. 2003
Udgivet eksterntJa

Programområde

  • Programområde 2: Vandressourcer

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