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TitleMorphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic
 
AuthorDeering, R; Bell, T; Forbes, D LORCID logo; Campbell, CORCID logo; Edinger, E
SourceSubaqueous mass movements and their consequences: assessing geohazards, environmental implications and economic significance of subaqueous landslides; by Lintern, D GORCID logo (ed.); Mosher, D CORCID logo (ed.); Moscardelli, L G (ed.); Bobrowsky, P TORCID logo (ed.); Campbell, D CORCID logo (ed.); Chaytor, J D (ed.); Clague, J J (ed.); Georgiopoulou, A (ed.); Lajeunesse, P (ed.); Normandeau, AORCID logo (ed.); Piper, D J WORCID logo (ed.); Scherwath, M (ed.); Stacey, CORCID logo (ed.); Turmel, D (ed.); Geological Society, Special Publication no. 477, 2018 p. 367-376, https://doi.org/10.1144/SP477.35
Image
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20170352
PublisherGeological Society, London (London, UK)
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®); html
ProgramPublic Safety Geoscience Marine Geohazards
Released2018 05 24
AbstractSubmarine slope failures in the nearshore waters of SE Baffin Island, eastern Canadian Arctic, present a challenge to coastal and seabed development. Submarine slope failures are a known geohazard in fjords in Norway, Chile, Alaska, British Columbia and elsewhere, but have received little attention in the coastal waters of Arctic Canada. Over the past 6 years, there has been a rapid expansion of multibeam echosounder (MBES) mapping in Canadian Arctic fjords, leading to the discovery of many submarine slope failures. One area that has been mapped in detail is inner Frobisher Bay. This macrotidal, seasonally ice-covered, semi-enclosed embayment has a glacially scoured bed, ice-contact deposits, including recessional moraines, and stratified glaciomarine and post-glacial silts and clays with abundant dropstones. The prevalence of submarine slope failures in the inner bay (one per 20 km2) appears to be anomalous. To date, MBES mapping has imaged at least 246 failures, ranging in size from 0.007 to 2.1 km2 and all within the glaciomarine and post-glacial succession. Morphometric analysis of these features based on high-resolution MBES bathymetry provides an insight into their spatial distribution, relative chronology, triggers and flow characteristics; factors essential to understanding the mechanisms underlying their abundance in this Canadian Arctic fjord.
Summary(Plain Language Summary, not published)
Seafloor landslides in the coastal waters of southeast Baffin Island, eastern Canadian Arctic, present a challenge to coastal and seabed development. Submarine slope failures, a known hazard in fiords elsewhere, have received little attention in the Canadian Arctic. Over the past six years, multibeam mapping has led to the discovery of many submarine slope failures in inner Frobisher Bay. Their prevalence in the inner bay (1 per 20 km2) appears to be anomalous. To date, the multibeam mapping has imaged at least 246 slides ranging in size from 0.007 to 2.1 km2, all within the glaciomarine and postglacial basin deposits. Morphological and geometric analysis of these features based on high-resolution multibeam bathymetry provides insight into their spatial distribution, relative chronology, potential triggers, and flow characteristics; factors essential to understanding the mechanisms underlying their abundance in this Canadian Arctic fiord.
GEOSCAN ID306545

 
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