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The shape and residual flow interaction of tidal oscillations

Dominic Reeve Orcid Logo, Jose Horrillo-Caraballo Orcid Logo, Harshinie Karunarathna Orcid Logo

Estuarine, Coastal and Shelf Science, Volume: 276, Start page: 108023

Swansea University Authors: Dominic Reeve Orcid Logo, Jose Horrillo-Caraballo Orcid Logo, Harshinie Karunarathna Orcid Logo

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DOI (Published version): 10.1016/j.ecss.2022.108023

Abstract

Tidal flows are seldom exactly sinusoidal, leading to a small discrepancy, or residual, over each tidal cycle. Although residuals are generally small in comparison with instantaneous currents, their cumulative effect is important for sediment transport and dispersion of contaminants. The meso-scale...

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Published in: Estuarine, Coastal and Shelf Science
ISSN: 0272-7714
Published: Elsevier BV 2022
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URI: https://cronfa.swan.ac.uk/Record/cronfa60724
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spelling 2022-08-26T12:04:56.2811017 v2 60724 2022-08-03 The shape and residual flow interaction of tidal oscillations 3e76fcc2bb3cde4ddee2c8edfd2f0082 0000-0003-1293-4743 Dominic Reeve Dominic Reeve true false 5166f9cd40b7c8628375d3f22d1c473c 0000-0001-7694-3812 Jose Horrillo-Caraballo Jose Horrillo-Caraballo true false 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false 2022-08-03 CIVL Tidal flows are seldom exactly sinusoidal, leading to a small discrepancy, or residual, over each tidal cycle. Although residuals are generally small in comparison with instantaneous currents, their cumulative effect is important for sediment transport and dispersion of contaminants. The meso-scale characteristics of tidal residual currents are investigated with a computational model of the Irish Sea. The role of the tidal oscillations, or eddies, in forcing the residual flow is considered first through theoretical considerations and secondly by calculating time mean flow quantities directly from the computational model. The tidal eddies contribute to the time mean vorticity balance through the tidal stresses which can be written in the form of a divergence of an eddy vorticity flux. In regions where the tidal flows are approximately horizontally non-divergent the anisotropy of the tidal eddies is strongly linked to their contribution to driving the residual flow. A measure of eddy anisotropy is proposed and this mirrors the shape and orientation of the tidal ellipses of the main tidal constituent. The vorticity balance of the residual flow is dominated by the frictional torque and the eddy vorticity flux divergence, with vorticity advection and vortex stretching by the residual flow generally being of secondary importance. Journal Article Estuarine, Coastal and Shelf Science 276 108023 Elsevier BV 0272-7714 computational model, tidal residual currents, vorticity, anisotropy 5 10 2022 2022-10-05 10.1016/j.ecss.2022.108023 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University SU Library paid the OA fee (TA Institutional Deal) The authors gratefully acknowledge funding from the European Regional Development Fund through the Welsh Government via the SEACAMS2 project. 2022-08-26T12:04:56.2811017 2022-08-03T17:05:59.1647200 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Dominic Reeve 0000-0003-1293-4743 1 Jose Horrillo-Caraballo 0000-0001-7694-3812 2 Harshinie Karunarathna 0000-0002-9087-3811 3 60724__25023__421989111f574e91ad6f4c83434a7051.pdf 60724_VoR.pdf 2022-08-26T12:03:42.4542932 Output 15663120 application/pdf Version of Record true © 2022 The Authors. This is an open access article under the CC BY license true eng http://creativecommons.org/licenses/by/4.0/
title The shape and residual flow interaction of tidal oscillations
spellingShingle The shape and residual flow interaction of tidal oscillations
Dominic Reeve
Jose Horrillo-Caraballo
Harshinie Karunarathna
title_short The shape and residual flow interaction of tidal oscillations
title_full The shape and residual flow interaction of tidal oscillations
title_fullStr The shape and residual flow interaction of tidal oscillations
title_full_unstemmed The shape and residual flow interaction of tidal oscillations
title_sort The shape and residual flow interaction of tidal oscillations
author_id_str_mv 3e76fcc2bb3cde4ddee2c8edfd2f0082
5166f9cd40b7c8628375d3f22d1c473c
0d3d327a240d49b53c78e02b7c00e625
author_id_fullname_str_mv 3e76fcc2bb3cde4ddee2c8edfd2f0082_***_Dominic Reeve
5166f9cd40b7c8628375d3f22d1c473c_***_Jose Horrillo-Caraballo
0d3d327a240d49b53c78e02b7c00e625_***_Harshinie Karunarathna
author Dominic Reeve
Jose Horrillo-Caraballo
Harshinie Karunarathna
author2 Dominic Reeve
Jose Horrillo-Caraballo
Harshinie Karunarathna
format Journal article
container_title Estuarine, Coastal and Shelf Science
container_volume 276
container_start_page 108023
publishDate 2022
institution Swansea University
issn 0272-7714
doi_str_mv 10.1016/j.ecss.2022.108023
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
document_store_str 1
active_str 0
description Tidal flows are seldom exactly sinusoidal, leading to a small discrepancy, or residual, over each tidal cycle. Although residuals are generally small in comparison with instantaneous currents, their cumulative effect is important for sediment transport and dispersion of contaminants. The meso-scale characteristics of tidal residual currents are investigated with a computational model of the Irish Sea. The role of the tidal oscillations, or eddies, in forcing the residual flow is considered first through theoretical considerations and secondly by calculating time mean flow quantities directly from the computational model. The tidal eddies contribute to the time mean vorticity balance through the tidal stresses which can be written in the form of a divergence of an eddy vorticity flux. In regions where the tidal flows are approximately horizontally non-divergent the anisotropy of the tidal eddies is strongly linked to their contribution to driving the residual flow. A measure of eddy anisotropy is proposed and this mirrors the shape and orientation of the tidal ellipses of the main tidal constituent. The vorticity balance of the residual flow is dominated by the frictional torque and the eddy vorticity flux divergence, with vorticity advection and vortex stretching by the residual flow generally being of secondary importance.
published_date 2022-10-05T04:19:04Z
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score 11.037166

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