Charles K. Paull
Powerful turbidity currents driven by dense basal layers
Paull, Charles K.; Talling, Peter J.; Maier, Katherine L.; Parsons, Daniel; Xu, Jingping; Caress, David W.; Gwiazda, Roberto; Lundsten, Eve M.; Anderson, Krystle; Barry, James P.; Chaffey, Mark; O’Reilly, Tom; Rosenberger, Kurt J.; Gales, Jenny A.; Kieft, Brian; McGann, Mary; Simmons, Steve M.; McCann, Mike; Sumner, Esther J.; Clare, Michael A.; Cartigny, Matthieu J.
Peter J. Talling
Katherine L. Maier
Professor Daniel Parsons D.Parsons@hull.ac.uk
Professor in Sedimentology/ Director, Energy and Environment Institute
David W. Caress
Eve M. Lundsten
James P. Barry
Kurt J. Rosenberger
Jenny A. Gales
Dr Steve Simmons S.Simmons@hull.ac.uk
Esther J. Sumner
Michael A. Clare
Matthieu J. Cartigny
Seafloor sediment flows (turbidity currents) are among the volumetrically most important yet least documented sediment transport processes on Earth. A scarcity of direct observations means that basic characteristics, such as whether flows are entirely dilute or driven by a dense basal layer, remain equivocal. Here we present the most detailed direct observations yet from oceanic turbidity currents. These powerful events in Monterey Canyon have frontal speeds of up to 7.2 m s−1, and carry heavy (800 kg) objects at speeds of ≥4 m s−1. We infer they consist of fast and dense near-bed layers, caused by remobilization of the seafloor, overlain by dilute clouds that outrun the dense layer. Seabed remobilization probably results from disturbance and liquefaction of loose-packed canyon-floor sand. Surprisingly, not all flows correlate with major perturbations such as storms, floods or earthquakes. We therefore provide a new view of sediment transport through submarine canyons into the deep-sea.
|Journal Article Type||Article|
|Publication Date||Dec 1, 2018|
|Publisher||Nature Publishing Group|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Paull, C. K., Talling, P. J., Maier, K. L., Parsons, D., Xu, J., Caress, D. W., …Cartigny, M. J. (2018). Powerful turbidity currents driven by dense basal layers. Nature communications, 9(1), https://doi.org/10.1038/s41467-018-06254-6|
|Keywords||General Biochemistry, Genetics and Molecular Biology; General Physics and Astronomy; General Chemistry|
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