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Flow dynamics and mixing processes in hydraulic jump arrays: Implications for channel-lobe transition zones

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

Authors

R. B. Wynn

J. Peakall

E. J. Sumner

S. E. Darby

E. Özsoy

D. Tezcan

E. Ozsoy

Abstract

© 2016 The Authors A detailed field investigation of a saline gravity current in the southwest Black Sea has enabled the first complete analysis of three-dimensional flow structure and dynamics of a series of linked hydraulic jumps in stratified, density-driven, flows. These field observations were collected using an acoustic Doppler current profiler mounted on an autonomous underwater vehicle, and reveal that internal mixing processes in hydraulic jumps, including flow expansion and recirculation, provide a previously unrecognised mechanism for grain-size sorting and segregation in stratified density-driven flows. Field observations suggest a newly identified type of hydraulic jump, that is a stratified low Froude number ( <  1.5–2) subaqueous hydraulic jump, with an enhanced ability to transport sediment downstream of the jump, in comparison to hydraulic jumps in other subaerial and submarine flows. These novel field data underpin a new process-based conceptual model of channel lobe transition zones (CLTZs) that explains the scattered offset nature of scours within such settings, the temporal variations in infill and erosion between adjacent scours, how bed shear stresses are maintained across the CLTZ, and why the locus of deposition is so far downstream of the scour zone.

Journal Article Type Article
Publication Date Nov 1, 2016
Journal Marine geology
Print ISSN 0025-3227
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 381
Pages 181-193
DOI https://doi.org/10.1016/j.margeo.2016.09.009
Keywords Gravity currents; Hydraulic jumps; Stratification; Channel-lobe transition zone
Publisher URL http://www.sciencedirect.com/science/article/pii/S0025322716302055
Additional Information This article is maintained by: Elsevier; Article Title: Flow dynamics and mixing processes in hydraulic jump arrays: Implications for channel-lobe transition zones; Journal Title: Marine Geology; CrossRef DOI link to publisher maintained version: http://dx.doi.org/10.1016/j.margeo.2016.09.009; Content Type: article; Copyright: © 2016 The Authors. Published by Elsevier B.V.

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This work is licensed under a Creative Commons Attribution 4.0 International License.



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