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TitleNear-bed hydrodynamics and sediment transport processes at the head of Logan Canyon on the central Scotian Slope
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AuthorLi, M Z; Prescott, R H; Robertson, A G
SourceGeological Survey of Canada, Open File 8174, 2017, 38 pages, https://doi.org/10.4095/299794
Year2017
PublisherNatural Resources Canada
Documentserial
Lang.English
Mediaon-line; digital
File formatpdf
ProvinceEastern offshore region; Nova Scotia
NTS10N/08; 10N/09; 10O/12
AreaLogan Canyon; Scotian Slope
Lat/Long WENS -60.1333 -59.9500 43.6000 43.4833
Subjectsmarine geology; surficial geology/geomorphology; engineering geology; geophysics; fossil fuels; petroleum resources; petroleum engineering; pipelines; continental margins; continental slope; submarine canyons; thalwegs; oceanography; sediment transport; sediment dispersal; hydrodynamics; sediment distribution; offshore currents; suspended sediments; tides; storms; erosion; turbidity currents; bed load; bathymetry; geophysical surveys; acoustic surveys, marine; side-scan sonar; grab samples; bulk samples; in-field instrumentation; photography; models; infrastructure; geological hazards; waves; wind; Phanerozoic; Cenozoic; Quaternary
Illustrationssketch maps; geophysical images; photographs; tables; plans; time series; spectra; profiles; plots; graphs
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Location
 
Natural Resources Canada Library - Ottawa (Earth Sciences)
 
ProgramMarine Geohazards, Public Safety Geoscience
ProgramGeoscience for Oceans Management
ProgramProgram of Energy Research and Development (PERD)
Released2017 03 28
Summary(Plain Language Summary, not published)
An instrumented seabed lander was deployed in the head of Logan Canyon in August 2005 to provide the first observations of near-bed hydrodynamics and sediment transport processes in a canyon on the Scotian Slope. The lander data show strong up- and down-canyon current pulses that reach 30-40 cm/s and typically last 2-5 hours. Temporal changes of the current pulses and their correlation with tidal elevation and temperature suggest that the observed high-frequency strong current pules were internal tide bores formed due to the focusing of tidal energy by the geometry of the canyon. The strong currents of the internal tidal bores caused frequent bedload and suspended-load transport events in which maximum suspended sediment concentration reached ~100 mg/l. The strong bottom currents of the internal tidal bores and the resulting intensive sediment transport could be a potential mechanism for sediment mobilization and turbidity current formation in canyons on the Scotian Slope margin.
GEOSCAN ID299794