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Superelevation and overspill control secondary flow dynamics in submarine channels

Dorrell, R.D., Darby, S.E., Peakall, J., Sumner, E.J., Parsons, D.R. and Wynn, R.B. (2013) Superelevation and overspill control secondary flow dynamics in submarine channels Journal of Geophysical Research, 118, (8), pp. 3895-3915. (doi:10.1002/jgrc.20277).

Record type: Article

Abstract

In subaerial and submarine meander bends, fluid flow travels downstream in a helical spiral, the structure of which is determined by centrifugal, hydrostatic, baroclinic, and Coriolis forces that together balance frictional stresses generated by the flow. The sense of rotation of this helical flow, and in particular, whether the near bed flow is directed toward the inner bank, e.g., “river-normal,” or outer bank, e.g., “river-reversed,” is crucial to the morphodynamic evolution of the channel. However, in recent years, there has been a debate over the river-normal or river-reversed nature of submarine flows. Herein, we develop a novel three-dimensional closure of secondary flow dynamics, incorporating downstream convective material transport, to cast new light on this debate. Specifically, we show that the presence of net radial material transport, arising from flow superelevation and overspill, exerts a key control on the near bed orientation of secondary flow in submarine meanders. Our analysis implies that river-reversed flows are likely to be much more prevalent throughout submarine-canyon fan systems than prior studies have indicated.

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More information

Published date: 13 August 2013
Keywords: density current, meander, secondary flow
Organisations: Geology & Geophysics, Marine Geoscience, Earth Surface Dynamics

Identifiers

Local EPrints ID: 360036
URI: http://eprints.soton.ac.uk/id/eprint/360036
ISSN: 0148-0227
PURE UUID: 36386f5c-fb55-4357-88cc-bff80548a1d4
ORCID for S.E. Darby: ORCID iD orcid.org/0000-0001-8778-4394

Catalogue record

Date deposited: 16 Dec 2013 10:02
Last modified: 18 Jul 2017 03:15

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Contributors

Author: R.D. Dorrell
Author: S.E. Darby ORCID iD
Author: J. Peakall
Author: E.J. Sumner
Author: D.R. Parsons
Author: R.B. Wynn

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