CGRG Bibliography of Canadian Geomorphology
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Author : Geertsema, M.; Hungr, O.; Evans, S.G.; andSchwab, J.W.
Date : 2005.
Title : A large rock slide – debris avalanche in cohesive soil at Pink Mountain, northeastern British Columbia, Canada.
Publication : European Geosciences Union. General Assembly 2005. April 24-29, 2005. Vienna, Austria. Geophysical Research Abstracts
Issue : 7:
Page(s) : 05403.



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Abstract

In early July 2002 a large rock slide - debris avalanche occurred on the west slope of the Pink Mountain anticline in northeastern British Columbia (57 04’ N; 122 52’ W). The slopes have been subjected to previous deformation and landsliding. Pre and post slide digital elevation models (DEMs) were created from aerial photography. Approximately 1.04Mm3 of sandstone and shale travelled nearly 2 km from an elevation of 1460 m to 1010 m. The landslide has a fahrböschung of 11.6 degrees and covered 43 ha. The rock debris entrained a certain amount of fine-textured till and colluvium increasing its volume by 15%. This entrainment caused partial liquefaction of the underlying soil thereby enhancing the mobility of the landslide. We used a Bingham rheological model to dynamically model the landslide with excellent correspondence between the analysis of the actual observed behaviour of the landslide.

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Bibliography of Canadian Geomorphology