Fine particle retention and deposition in regions of cyclonic tidal current rotation
Fine particle retention and deposition in regions of cyclonic tidal current rotation
Benthic sediments in continental shelf seas control a variety of biogeochemical processes, yet their composition, especially that of fine sediment, remains difficult to predict. Mechanisms for mud or fine sediment deposition and retention are not fully understood. Using sediment data and a hydrodynamic model of the Northwest European shelf seas, a relationship is shown to exist between fine benthic sediment composition and regions of cyclonic tidal current rotation. The reduced thickness of cyclonic tidal benthic boundary layers compared with the anticyclonic case promotes deposition of fine sediment and trapping of resuspended material. Adding the effects of the benthic boundary layer thickness, as influenced by ellipticity or not, sheds some light on the limitations of approaches only focusing on bed shear stress and sediment pathways to predict the location of mud deposits. A tidal boundary layer predictor that includes ellipticity alongside tidal current magnitude and depth was shown to spatially agree with maps of mud deposits.
122-134
Williams, M.E.
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Amoudry, L.O.
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Thompson, Charlotte
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Brown, J.M.
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April 2019
Williams, M.E.
016fcf2f-ba77-45ab-8ea7-0d3ecbb317e1
Amoudry, L.O.
0a9f7990-e5ba-4a7e-ad49-d55639ac4222
Thompson, Charlotte
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Brown, J.M.
86c68843-fe2f-4f86-accc-f4571259a76a
Williams, M.E., Amoudry, L.O., Thompson, Charlotte and Brown, J.M.
(2019)
Fine particle retention and deposition in regions of cyclonic tidal current rotation.
Marine Geology, 410, .
(doi:10.1016/j.margeo.2019.01.006).
Abstract
Benthic sediments in continental shelf seas control a variety of biogeochemical processes, yet their composition, especially that of fine sediment, remains difficult to predict. Mechanisms for mud or fine sediment deposition and retention are not fully understood. Using sediment data and a hydrodynamic model of the Northwest European shelf seas, a relationship is shown to exist between fine benthic sediment composition and regions of cyclonic tidal current rotation. The reduced thickness of cyclonic tidal benthic boundary layers compared with the anticyclonic case promotes deposition of fine sediment and trapping of resuspended material. Adding the effects of the benthic boundary layer thickness, as influenced by ellipticity or not, sheds some light on the limitations of approaches only focusing on bed shear stress and sediment pathways to predict the location of mud deposits. A tidal boundary layer predictor that includes ellipticity alongside tidal current magnitude and depth was shown to spatially agree with maps of mud deposits.
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Fine Particle Retention
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Accepted/In Press date: 16 January 2019
e-pub ahead of print date: 19 January 2019
Published date: April 2019
Identifiers
Local EPrints ID: 427555
URI: http://eprints.soton.ac.uk/id/eprint/427555
ISSN: 0025-3227
PURE UUID: d392272f-b544-41cf-aaa3-1c63b9086999
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Date deposited: 23 Jan 2019 17:30
Last modified: 16 Mar 2024 07:31
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Author:
M.E. Williams
Author:
L.O. Amoudry
Author:
J.M. Brown
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