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Morphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic

Robert Deering, Trevor Bell, Donald L. Forbes, Calvin Campbell and Evan Edinger
Morphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic (in Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides, D. G. Lintern (editor), David C. Mosher (editor), L. G. Moscardelli (editor), P. T. Bobrowsky (editor), C. Campbell (editor), J. D. Chaytor (editor), J. J. Clague (editor), A. Georgiopoulou (editor), Patrick Lajeunesse (editor), Alexandre Normandeau (editor), David J. W. Piper (editor), M. Scherwath (editor), C. Stacey (editor) and D. Turmel (editor))
Special Publication - Geological Society of London (May 2018) 477 (1): 367-376

Abstract

Submarine 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 km (super 2) ) appears to be anomalous. To date, MBES mapping has imaged at least 246 failures, ranging in size from 0.007 to 2.1 km (super 2) 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.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 477
Serial Issue: 1
Title: Morphological characterization of submarine slope failures in a semi-enclosed fjord, Frobisher Bay, eastern Canadian Arctic
Title: Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides
Author(s): Deering, RobertBell, TrevorForbes, Donald L.Campbell, CalvinEdinger, Evan
Author(s): Lintern, D. G.editor
Author(s): Mosher, David C.editor
Author(s): Moscardelli, L. G.editor
Author(s): Bobrowsky, P. T.editor
Author(s): Campbell, C.editor
Author(s): Chaytor, J. D.editor
Author(s): Clague, J. J.editor
Author(s): Georgiopoulou, A.editor
Author(s): Lajeunesse, Patrickeditor
Author(s): Normandeau, Alexandreeditor
Author(s): Piper, David J. W.editor
Author(s): Scherwath, M.editor
Author(s): Stacey, C.editor
Author(s): Turmel, D.editor
Affiliation: Memorial University of Newfoundland, Department of Geography, Saint John's, NL, Canada
Pages: 367-376
Published: 20180524
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 27
Accession Number: 2018-052921
Categories: Oceanography
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, sketch maps
N63°19'60" - N63°40'00", W68°40'00" - W68°00'00"
Secondary Affiliation: Canadian Geological Survey, CAN, Canada
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201828
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