ORCID
- Gales, Jenny: 0000-0003-4402-5800
Abstract
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.
DOI
10.1038/s41467-018-06254-6
Publication Date
2018-10-05
Publication Title
Nature Communications
Volume
9
Issue
1
ISSN
2041-1723
Embargo Period
2019-12-14
Organisational Unit
School of Biological and Marine Sciences
Recommended Citation
Paull, C. K., Talling, P., Maier, K., Parsons, D., Xu, J., Caress, D., Gwiazda, R., Lundsten, E., Anderson, K., Barry, J., Chaffey, M., O'Reilly, T., Rosenberger, K., Gales, J., Kieft, B., McGann, M., Simmons, S., McCann, M., Sumner, E., Clare, M., & Cartigny, M. (2018) 'Powerful turbidity currents driven by dense basal layers', Nature Communications, 9(1). Available at: https://doi.org/10.1038/s41467-018-06254-6
