| Title | Near-bed hydrodynamics and sediment transport processes at the head of Logan Canyon on the central Scotian Slope |
| Download | Downloads |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Li, M Z ;
Prescott, R H; Robertson, A G |
| Source | Geological Survey of Canada, Open File 8174, 2017, 38 pages, https://doi.org/10.4095/299794  Open Access |
| Image |  |
| Year | 2017 |
| Publisher | Natural Resources Canada |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | Eastern offshore region; Nova Scotia |
| NTS | 10N/08; 10N/09; 10O/12 |
| Area | Logan Canyon; Scotian Slope |
| Lat/Long WENS | -60.1333 -59.9500 43.6000 43.4833 |
| Subjects | marine 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; Wind; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | sketch maps; geophysical images; photographs; tables; plans; time series; spectra; profiles; plots; graphs |
| Program | Public Safety
Geoscience Marine Geohazards |
| Program | Geoscience
for Oceans Management |
| Program | Program of Energy Research and Development (PERD) |
| Released | 2017 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 ID | 299794 |
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