CGRG Bibliography of Canadian Geomorphology
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Author : Geertsema, M.; Hungr, O.; Schwab, J.W.; and Evans, S.G.
Date : 2006.
Title : -A large rockslide-debris avalanche in cohesive soil at Pink Mountain,northeastern British Columbia, Canada.
Publication : Engineering Geology
Issue : 83(1-3):
Page(s) : 64-75.



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Abstract

In early July 2002, a large rockslide–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 1.04 M m3 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° 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