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Revisiting the relationship between tidal asymmetry and basin morphology: a comparison between 1D and 2D models

Revisiting the relationship between tidal asymmetry and basin morphology: a comparison between 1D and 2D models
Revisiting the relationship between tidal asymmetry and basin morphology: a comparison between 1D and 2D models
Tidal basin morphology is strongly dependent on the condition of tidal asymmetry which may result in either net import (flood-dominance) or export (ebb-dominance) of sediment. Based on the one-dimensional (1D) shallow water equations, various stability relationships have been developed linking tidal parameters with basin geometry. This study revisits the widely used numerical stability relationship developed by Friedrichs and Aubrey (1988), using a 2D depth-averaged model which is able to describe a more extensive flow field and more realistic bathymetries. Model comparison between 1D and 2D models indicates that excluding or including intertidal areas as a momentum-conveying component can highly affect the tidal velocity distribution and magnitude, particularly when the relative water depth is large (i.e., the ratio between tidal amplitude and mean water depth is small). Meanwhile, the tidal distortion parameters (relative tidal phase 2M2-M4 and tidal amplitude ratio M4/M2) derived from the 2D model appear to be more strongly controlled by the relative water depth (a/h) than that in the 1D model. Further research can be devoted to developing more generic stability relationships which can be applied in a more quantitative manner.
0749-0208
151–155
Zhou, Zeng
a167cd81-84c7-4e55-9e28-4529e26e7c01
Chen, Luying
c029cdc2-a5ab-463a-a69f-b7de62a50d5f
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
Coco, Giovanni
8a6c97e1-2a44-4f03-ad8d-e03dbc2908db
Friedrichs, Carl
26f8b6da-ed96-4151-b43a-20fa9d69d30e
Zhang, Changkuan
dfdb560e-6606-4ba2-86be-f7068ef48393
Zhou, Zeng
a167cd81-84c7-4e55-9e28-4529e26e7c01
Chen, Luying
c029cdc2-a5ab-463a-a69f-b7de62a50d5f
Townend, Ian
f72e5186-cae8-41fd-8712-d5746f78328e
Coco, Giovanni
8a6c97e1-2a44-4f03-ad8d-e03dbc2908db
Friedrichs, Carl
26f8b6da-ed96-4151-b43a-20fa9d69d30e
Zhang, Changkuan
dfdb560e-6606-4ba2-86be-f7068ef48393

Zhou, Zeng, Chen, Luying, Townend, Ian, Coco, Giovanni, Friedrichs, Carl and Zhang, Changkuan (2018) Revisiting the relationship between tidal asymmetry and basin morphology: a comparison between 1D and 2D models. Journal of Coastal Research, 85, 151–155. (doi:10.2112/SI85-031.1).

Record type: Article

Abstract

Tidal basin morphology is strongly dependent on the condition of tidal asymmetry which may result in either net import (flood-dominance) or export (ebb-dominance) of sediment. Based on the one-dimensional (1D) shallow water equations, various stability relationships have been developed linking tidal parameters with basin geometry. This study revisits the widely used numerical stability relationship developed by Friedrichs and Aubrey (1988), using a 2D depth-averaged model which is able to describe a more extensive flow field and more realistic bathymetries. Model comparison between 1D and 2D models indicates that excluding or including intertidal areas as a momentum-conveying component can highly affect the tidal velocity distribution and magnitude, particularly when the relative water depth is large (i.e., the ratio between tidal amplitude and mean water depth is small). Meanwhile, the tidal distortion parameters (relative tidal phase 2M2-M4 and tidal amplitude ratio M4/M2) derived from the 2D model appear to be more strongly controlled by the relative water depth (a/h) than that in the 1D model. Further research can be devoted to developing more generic stability relationships which can be applied in a more quantitative manner.

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Accepted/In Press date: 7 August 2017
Published date: 10 February 2018
Additional Information: Special Issue 85 - Proceedings of the 15th International Coastal Symposium

Identifiers

Local EPrints ID: 418939
URI: http://eprints.soton.ac.uk/id/eprint/418939
ISSN: 0749-0208
PURE UUID: 599a5e20-d820-44a8-b30b-fda3d3f829d3
ORCID for Ian Townend: ORCID iD orcid.org/0000-0003-2101-3858

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Date deposited: 26 Mar 2018 16:30
Last modified: 16 Mar 2024 03:24

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Contributors

Author: Zeng Zhou
Author: Luying Chen
Author: Ian Townend ORCID iD
Author: Giovanni Coco
Author: Carl Friedrichs
Author: Changkuan Zhang

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