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Self-sharpening induces jet-like structure in seafloor gravity currents

Dorrell, R. M.; Peakall, J.; Darby, S. E.; Parsons, D. R.; Johnson, J.; Sumner, E. J.; Wynn, R. B.; Özsoy, E.; Tezcan, D.


J. Peakall

S. E. Darby

D. R. Parsons

J. Johnson

E. J. Sumner

R. B. Wynn

E. Özsoy

D. Tezcan


Gravity currents are the primary means by which sediments, solutes and heat are transported across the ocean-floor. Existing theory of gravity current flow employs a statistically-stable model of turbulent diffusion that has been extant since the 1960s. Here we present the first set of detailed spatial data from a gravity current over a rough seafloor that demonstrate that this existing paradigm is not universal. Specifically, in contrast to predictions from turbulent diffusion theory, self-sharpened velocity and concentration profiles and a stable barrier to mixing are observed. Our new observations are explained by statistically-unstable mixing and self-sharpening, by boundary-induced internal gravity waves; as predicted by recent advances in fluid dynamics. Self-sharpening helps explain phenomena such as ultra-long runout of gravity currents and restricted growth of bedforms, and highlights increased geohazard risk to marine infrastructure. These processes likely have broader application, for example to wave-turbulence interaction, and mixing processes in environmental flows.


Dorrell, R. M., Peakall, J., Darby, S. E., Parsons, D. R., Johnson, J., Sumner, E. J., …Tezcan, D. (2019). Self-sharpening induces jet-like structure in seafloor gravity currents. Nature communications, 10(1), Article 1381.

Journal Article Type Article
Acceptance Date Feb 26, 2019
Online Publication Date Mar 27, 2019
Publication Date 2019-12
Deposit Date Mar 28, 2019
Publicly Available Date Mar 29, 2019
Journal Nature Communications
Electronic ISSN 2041-1723
Publisher Nature Publishing Group
Peer Reviewed Peer Reviewed
Volume 10
Issue 1
Article Number 1381
Keywords General Biochemistry, Genetics and Molecular Biology; General Physics and Astronomy; General Chemistry
Public URL
Publisher URL


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