Landslides

, Volume 5, Issue 3, pp 271–280 | Cite as

Erosion and morphology of a debris flow caused by a glacial lake outburst flood, Western Norway

  • Hedda Breien
  • Fabio V. De Blasio
  • Anders Elverhøi
  • Kaare Høeg
Original Article

Abstract

This article documents a 240,000-m3 debris flow resulting from a glacial lake outburst flood in Fjærland, Western Norway, May 8, 2004. The event started when a glacial lake breached a moraine ridge. The ensuing debris flow was able to erode material along its path, increasing in volume from about 25,000 to 240,000 m3 before depositing about 3 km from its starting point. Field investigations, pre- and post-flow aerial photographs as well as airborne laser scanning (LIDAR) were used to describe and investigate the flow. The most striking and unusual feature of this case study is the very pronounced erosion and bulking. We have made a detailed study of this aspect. Erosion and entrainment is quantified and the final volume of the debris flow is determined. We also present geometrical and sedimentological features of the final deposit. Based on the Fjærland data, we suggest that a self-sustaining mechanism might partly explain the extreme growth of debris flows traversing soft terrain.

Keywords

Debris flow Erosion Entrainment Glacier hazard Fjærland Norway 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • Hedda Breien
    • 1
    • 2
  • Fabio V. De Blasio
    • 1
    • 2
  • Anders Elverhøi
    • 1
    • 2
  • Kaare Høeg
    • 1
    • 2
  1. 1.Department of GeosciencesUniversity of OsloOsloNorway
  2. 2.International Centre for Geohazardsc/o Norwegian Geotechnical InstituteOsloNorway

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