GEOSCAN Search Results: Fastlink


TitleEffective monitoring of permafrost coast erosion: wide-scale storm impacts on outer islands in the Mackenzie Delta Area
AuthorLim, M; Whalen, DORCID logo; Mann, P J; Fraser, P; Berry, H B; Irish, C; Cockney, K; Woodward, J
SourceFrontiers in Earth Science vol. 8, 561322, 2020 p. 1-17, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20200532
PublisherFrontiers Media S.A.
Mediapaper; on-line; digital
File formatpdf; html
ProvinceNorthwest Territories
NTS107C/05; 107C/06; 107C/07; 107C/10; 107C/11; 107C/12
AreaMackenzie River; Beaufort Sea; Tuktoyaktuk Peninsula; Peninsula Point; Pelly Island; Hooper Island; Pullen Island
Lat/Long WENS-136.0000 -133.0000 69.8333 69.2500
Subjectssurficial geology/geomorphology; environmental geology; geophysics; Nature and Environment; Science and Technology; coastal environment; coastal erosion; permafrost; ground ice; massive ice; storms; climate, arctic; climate effects; landslides; slumps; debris flows; debris fans; slope failures; remote sensing; photogrammetric surveys; terrain sensitivity; models; mapping techniques; Mackenzie Delta; Climate change; cumulative effects; Weather; permafrost thaw
Illustrationslocation maps; 3-D diagrams; models; tables; 3-D images; profiles; time series
ProgramClimate Change Geoscience Coastal Infrastructure
Released2020 10 08
AbstractPermafrost coasts are extensive in scale and complex in nature, resulting in particular challenges for understanding how they respond to both long-term shifts in climate and short-term extreme weather events. Taking examples from the Canadian Beaufort Sea coastline characterized by extensive areas of massive ground ice within slump and block failure complexes, we conduct a quantitative analysis of the practical performance of helicopter-based photogrammetry. The results demonstrate that large scale (>1 km2) surface models can be achieved at comparable accuracy to standard unmanned aerial vehicle surveys, but 36 times faster. Large scale models have greater potential for progressive alignment and contrast issues and so breaking down image sequences into coherent chunks has been found the most effective technique for accurate landscape reconstructions. The approach has subsequently been applied in a responsive acquisition immediately before and after a large storm event and during conditions (wind gusts >50 km h-1) that would have prohibited unmanned aerial vehicle data acquisition. Trading lower resolution surface models for large scale coverage and more effective responsive monitoring, the helicopter-based data have been applied to assess storm driven-change across the exposed outer islands of the Mackenzie Delta area for the first time. These data show that the main storm impacts were concentrated on exposed North orientated permafrost cliff sections (particularly low cliffs, >20 m in height) where cliff recession was 43% of annual rates and in places up to 29% of the annual site-wide erosion volume was recorded in this single event. In contrast, the thaw-slump complexes remained relatively unaffected, debris flow fans were generally more resistant to storm erosion than the ice-rich cliffs, perhaps due to the relatively low amounts of precipitation that occurred. Therefore, the variability of permafrost coast erosion rates is controlled by interactions between both the forcing conditions and local response mechanisms. Helicopter-based photogrammetric surveys have the potential to effectively analyze these controls with greater spatial and temporal consistency across more representative scales and resolutions than has previously been achieved, improving the capacity to adequately constrain and ultimately project future Arctic coast sensitivity.

Date modified: