The University of Southampton
University of Southampton Institutional Repository

Measuring and modelling sediment transport on a macrotidal ridge and runnel beach: an intercomparison

Measuring and modelling sediment transport on a macrotidal ridge and runnel beach: an intercomparison
Measuring and modelling sediment transport on a macrotidal ridge and runnel beach: an intercomparison
Observations of hydrodynamics, fluorescent tracer dispersal and beach morphology were acquired in the intertidal zone of a macrotidal ridge and runnel beach. High frequency hydrodynamic data from pressure transducers and electromagnetic current meters were used to describe flow patterns in the intertidal zone while sediment transport rates were estimated using energetics and empirical models. Results from fluorescent tracer experiments provided information on net sediment movement over periods ranging from one to five tidal cycles whereas morphometric analysis was carried out to determine net beach movement during a period of 24 tidal cycles. Comparison of the results showed that sediment transport based on the hydrodynamic measurements did not agree with sediment movement derived using the tracer and morphometric methods. This disagreement is because the latter methods integrate processes occurring throughout the whole tidal cycle including those at very low water depths (swash zone processes). Hydrodynamic data were limited to periods of the tidal cycle where the mean water depth was greater than 0.5 m. Such limitation, imposed by the physical dimensions, principle of operation and installation procedures of the instruments is common in nearshore studies. Sediment transport results obtained by using hydrodynamic data obtained in macrotidal areas would be incomplete if swash-zone processes are not covered by the sampling scheme. However, comparison of results obtained for shorter periods (i.e. excluding shallow water) with those from other methods that integrate over the whole tidal cycle can be used to extract information on sedimentary processes for periods where no direct data are available.
sediment transport measurements, hydrodynamics, intertidal zone, macrotidal beach, ridge and runnel beach, tracre, waves, currents, sediment transport modelling
0749-0208
315-330
Voulgaris, G.
c695d93c-1092-4223-b02a-6c1fc5fcb45c
Simmonds, D.
bf67873d-4036-4877-924d-ef67bf4e2bdc
Michel, D.
8ded884b-b50f-4c35-a901-e85ff891acda
Howa, H.
491391a8-7cad-435d-8c8b-343381837306
Collins, M.B.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Huntley, D.A.
c0ae6ddd-cb02-432a-a3e8-f4e7dfe161e7
Voulgaris, G.
c695d93c-1092-4223-b02a-6c1fc5fcb45c
Simmonds, D.
bf67873d-4036-4877-924d-ef67bf4e2bdc
Michel, D.
8ded884b-b50f-4c35-a901-e85ff891acda
Howa, H.
491391a8-7cad-435d-8c8b-343381837306
Collins, M.B.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Huntley, D.A.
c0ae6ddd-cb02-432a-a3e8-f4e7dfe161e7

Voulgaris, G., Simmonds, D., Michel, D., Howa, H., Collins, M.B. and Huntley, D.A. (1998) Measuring and modelling sediment transport on a macrotidal ridge and runnel beach: an intercomparison. Journal of Coastal Research, 14 (1), 315-330.

Record type: Article

Abstract

Observations of hydrodynamics, fluorescent tracer dispersal and beach morphology were acquired in the intertidal zone of a macrotidal ridge and runnel beach. High frequency hydrodynamic data from pressure transducers and electromagnetic current meters were used to describe flow patterns in the intertidal zone while sediment transport rates were estimated using energetics and empirical models. Results from fluorescent tracer experiments provided information on net sediment movement over periods ranging from one to five tidal cycles whereas morphometric analysis was carried out to determine net beach movement during a period of 24 tidal cycles. Comparison of the results showed that sediment transport based on the hydrodynamic measurements did not agree with sediment movement derived using the tracer and morphometric methods. This disagreement is because the latter methods integrate processes occurring throughout the whole tidal cycle including those at very low water depths (swash zone processes). Hydrodynamic data were limited to periods of the tidal cycle where the mean water depth was greater than 0.5 m. Such limitation, imposed by the physical dimensions, principle of operation and installation procedures of the instruments is common in nearshore studies. Sediment transport results obtained by using hydrodynamic data obtained in macrotidal areas would be incomplete if swash-zone processes are not covered by the sampling scheme. However, comparison of results obtained for shorter periods (i.e. excluding shallow water) with those from other methods that integrate over the whole tidal cycle can be used to extract information on sedimentary processes for periods where no direct data are available.

Full text not available from this repository.

More information

Published date: 1998
Keywords: sediment transport measurements, hydrodynamics, intertidal zone, macrotidal beach, ridge and runnel beach, tracre, waves, currents, sediment transport modelling

Identifiers

Local EPrints ID: 180311
URI: http://eprints.soton.ac.uk/id/eprint/180311
ISSN: 0749-0208
PURE UUID: 334619a0-1b29-4b73-892e-71ceb81bf779

Catalogue record

Date deposited: 06 Apr 2011 15:09
Last modified: 09 Dec 2019 20:23

Export record

Contributors

Author: G. Voulgaris
Author: D. Simmonds
Author: D. Michel
Author: H. Howa
Author: M.B. Collins
Author: D.A. Huntley

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×