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BARDEX II: Nearshore sediment resuspension and bed morphology

BARDEX II: Nearshore sediment resuspension and bed morphology
BARDEX II: Nearshore sediment resuspension and bed morphology
Sediment resuspension in the region outside the surf zone is known to contribute to the morphological response of barrier beaches to wave forcing, such as onshore bar migration processes. However, few measurements in this region exist, limiting our ability to quantify its contribution. These processes are complicated by the presence of bedforms in the nearshore, which alter the sand transport processes while modifying bed roughness in a complex feedback mechanism. The Hydralab IV funded BARDEX II experiments, which took place in the Delta Flume in 2012, were used to provide measurements of these processes in the nearshore of a sandy barrier beach (D50 = 0.42mm) under a range of wave conditions (Hs = 0.3 - 0.8 m; Tp = 4 – 2 s) and water levels, through deployment of a suite of acoustic instruments measuring flow velocity, near-bed turbulence, sediment resuspension profiles and bed morphology in cross-section and plan view. Initial findings indicate that sediment suspension in the nearshore appears to be controlled by a combination of near-bed turbulent bursting processes which results in near-instantaneous low concentration suspensions restricted to the bottom boundary layer, and vortex shedding from bedforms which results in higher concentration suspensions which are larger in scale than vertical eddy sizes, and perpetuate outside of the bottom boundary layer.
Nearshore sediment transport, near-bed turbulence, bed roughness
0749-0208
1593-1598
Thompson, Charlie E.L.
2a304aa6-761e-4d99-b227-cedb67129bfb
Kassem, Hachem
658efa7a-a02c-4b29-9d07-5d57e95a4b51
Williams, Jon
a2e3bccf-b9b5-4296-8ba4-6cad196df346
Thompson, Charlie E.L.
2a304aa6-761e-4d99-b227-cedb67129bfb
Kassem, Hachem
658efa7a-a02c-4b29-9d07-5d57e95a4b51
Williams, Jon
a2e3bccf-b9b5-4296-8ba4-6cad196df346

Thompson, Charlie E.L., Kassem, Hachem and Williams, Jon (2013) BARDEX II: Nearshore sediment resuspension and bed morphology. [in special issue: Proceedings 12th International Coastal Symposium (Plymouth, England)] Journal of Coastal Research, SI 65, 1593-1598. (doi:10.2112/SI65-269.1).

Record type: Article

Abstract

Sediment resuspension in the region outside the surf zone is known to contribute to the morphological response of barrier beaches to wave forcing, such as onshore bar migration processes. However, few measurements in this region exist, limiting our ability to quantify its contribution. These processes are complicated by the presence of bedforms in the nearshore, which alter the sand transport processes while modifying bed roughness in a complex feedback mechanism. The Hydralab IV funded BARDEX II experiments, which took place in the Delta Flume in 2012, were used to provide measurements of these processes in the nearshore of a sandy barrier beach (D50 = 0.42mm) under a range of wave conditions (Hs = 0.3 - 0.8 m; Tp = 4 – 2 s) and water levels, through deployment of a suite of acoustic instruments measuring flow velocity, near-bed turbulence, sediment resuspension profiles and bed morphology in cross-section and plan view. Initial findings indicate that sediment suspension in the nearshore appears to be controlled by a combination of near-bed turbulent bursting processes which results in near-instantaneous low concentration suspensions restricted to the bottom boundary layer, and vortex shedding from bedforms which results in higher concentration suspensions which are larger in scale than vertical eddy sizes, and perpetuate outside of the bottom boundary layer.

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Published date: 2013
Keywords: Nearshore sediment transport, near-bed turbulence, bed roughness
Organisations: Geology & Geophysics, Coastal & Shelf Research

Identifiers

Local EPrints ID: 356024
URI: http://eprints.soton.ac.uk/id/eprint/356024
ISSN: 0749-0208
PURE UUID: 3283f2c4-26d6-4982-addc-bccb3136d8a4
ORCID for Charlie E.L. Thompson: ORCID iD orcid.org/0000-0003-1105-6838
ORCID for Hachem Kassem: ORCID iD orcid.org/0000-0002-5936-6037

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Date deposited: 21 Aug 2013 09:19
Last modified: 17 Feb 2022 02:35

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Contributors

Author: Hachem Kassem ORCID iD
Author: Jon Williams

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