Dorrell, RM orcid.org/0000-0003-4257-7273, Peakall, J, Sumner, EJ et al. (5 more authors) (2016) Flow dynamics and mixing processes in hydraulic jump arrays: Implications for channel-lobe transition zones. Marine Geology, 381. pp. 181-193. ISSN 0025-3227
Abstract
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.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
Keywords: | gravity currents,; hydraulic jumps; channel-lobe transition zone; stratification |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Institute for Applied Geosciences (IAG) (Leeds) |
Funding Information: | Funder Grant number NERC NE/F020511/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Sep 2016 13:15 |
Last Modified: | 15 Dec 2018 17:41 |
Published Version: | http://dx.doi.org/10.1016/j.margeo.2016.09.009 |
Status: | Published |
Publisher: | Elsevier |
Identification Number: | 10.1016/j.margeo.2016.09.009 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:104893 |