Near-bed hydrodynamics and sediment transport processes at the head of Logan Canyon on the central Scotian Slope / M.Z. Li, R.H. Prescott, and A.G. Robertson. : M183-2/8174E-PDF

"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”--Summary provided by publisher.

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