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The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density

The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density
The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density
In a macrotidal environment with offshore breakwaters (Elmer, West Sussex) a new approach for the identification of the sediment transport pathways with grain size trend analysis (GSTA) was undertaken using statistical parameters (mean, sorting and skewness) directly derived from settling velocities distributions. The same samples were analysed with sieving (quarter- and half-phi resolution) and GSTA was performed again in order to directly compare the resultant sediment transport directions derived with the two analytical techniques. Furthermore, both regular and irregular sampling distributions were used to recalculate GSTA. Hydrodynamic data were collected in different locations around the breakwaters and net sediment transport directions were calculated in order to assess the accuracy of the sediment transport pathway directions derived with the different analytical techniques.

The accuracy of settling velocity in determining the statistical parameters of the grain size distribution is identified, especially for the fine-medium sand sediments. Settling velocities produced better results than the sieving; the quarter-phi resolution producing the poorer results in comparison with the coarser half-phi resolution. The results for the different spatial sampling strategies are found to depend upon the number of samples utilised; that shows that the accuracy of the GSTA is based upon the ability of representing, adequately, the spatial distribution of the sediment parameters.

sediment transport, settling velocity, grid spacing, grain size trends, breakwaters, Elmer
0025-3227
132-148
Plomaritis, T.A.
b67f2a33-91ff-4a7e-ae46-7e57c412f356
Paphitis, D.
6cef7762-66e8-4e11-ad64-58c2ef53b784
Collins, M.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Plomaritis, T.A.
b67f2a33-91ff-4a7e-ae46-7e57c412f356
Paphitis, D.
6cef7762-66e8-4e11-ad64-58c2ef53b784
Collins, M.
3b70278b-0004-45e0-b3c9-0debdf0a9351

Plomaritis, T.A., Paphitis, D. and Collins, M. (2008) The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density. Marine Geology, 253 (3-4), 132-148. (doi:10.1016/j.margeo.2008.05.003).

Record type: Article

Abstract

In a macrotidal environment with offshore breakwaters (Elmer, West Sussex) a new approach for the identification of the sediment transport pathways with grain size trend analysis (GSTA) was undertaken using statistical parameters (mean, sorting and skewness) directly derived from settling velocities distributions. The same samples were analysed with sieving (quarter- and half-phi resolution) and GSTA was performed again in order to directly compare the resultant sediment transport directions derived with the two analytical techniques. Furthermore, both regular and irregular sampling distributions were used to recalculate GSTA. Hydrodynamic data were collected in different locations around the breakwaters and net sediment transport directions were calculated in order to assess the accuracy of the sediment transport pathway directions derived with the different analytical techniques.

The accuracy of settling velocity in determining the statistical parameters of the grain size distribution is identified, especially for the fine-medium sand sediments. Settling velocities produced better results than the sieving; the quarter-phi resolution producing the poorer results in comparison with the coarser half-phi resolution. The results for the different spatial sampling strategies are found to depend upon the number of samples utilised; that shows that the accuracy of the GSTA is based upon the ability of representing, adequately, the spatial distribution of the sediment parameters.

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More information

Published date: 7 August 2008
Keywords: sediment transport, settling velocity, grid spacing, grain size trends, breakwaters, Elmer

Identifiers

Local EPrints ID: 58595
URI: http://eprints.soton.ac.uk/id/eprint/58595
ISSN: 0025-3227
PURE UUID: 32fd420d-c2aa-4793-ba42-9961abf2357a

Catalogue record

Date deposited: 14 Aug 2008
Last modified: 08 Jan 2022 19:04

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Contributors

Author: T.A. Plomaritis
Author: D. Paphitis
Author: M. Collins

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