Retrogression characteristics of landslides in fine-grained permafrost soils, Mackenzie Valley, Canada |
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| Authors: | Baolin Wang Bhuwani Paudel Haoqiang Li |
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| Institution: | (1) Natural Resources Canada, 601 Booth Street, Ottawa, ON, K1A 0E8, Canada |
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| Abstract: | Thirteen landslides (retrogressive thaw flows) were investigated to study the behavior of thaw retrogression in permafrost
in the Mackenzie Valley, Northwest Territories (NWT), Canada. Those landslides are all in fine-grained ice-rich permafrost
soils. Such landslides usually start from small-scale slope failures followed by retrogressive thaw flows when ice-rich permafrost
soils are exposed to the atmosphere. The landslides were marked with survey stakes to measure their retreat rates for the
thawing season of 2007. Two correlations are presented: one is between scarp wall height and retreat rate; another is between
overall slope angle and retreat rate. It was found that thaw flow retrogression rate increases with increase in scarp wall
height and slope angle up to a certain limit. It was also confirmed that thaw flow retrogression is not influenced by slope
orientation. |
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| Keywords: | Landslide Thaw flow Permafrost Retrogression Slope orientation Canada Mackenzie Valley |
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