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Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary

William Bennett Orcid Logo, Thomas van Veelen, Tom Fairchild Orcid Logo, John Griffin Orcid Logo, Harshinie Karunarathna Orcid Logo

Journal of Marine Science and Engineering, Volume: 8, Issue: 5, Start page: 373

Swansea University Authors: William Bennett Orcid Logo, Thomas van Veelen, Tom Fairchild Orcid Logo, John Griffin Orcid Logo, Harshinie Karunarathna Orcid Logo

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DOI (Published version): 10.3390/jmse8050373

Abstract

Saltmarshes are considered as natural coastal defences. However, owing to the large context dependency, there is much discussion over their effectiveness in providing coastal protection and the necessity of additional coastal defence interventions. The macro-tidal Taf Estuary in south-west Wales was...

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Published in: Journal of Marine Science and Engineering
ISSN: 2077-1312
Published: MDPI AG 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54650
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However, owing to the large context dependency, there is much discussion over their effectiveness in providing coastal protection and the necessity of additional coastal defence interventions. The macro-tidal Taf Estuary in south-west Wales was chosen as the case study in this paper to investigate the effects of anthropogenic coastal defence interventions such as construction of hard defences, managed realignment, and altering land use of the saltmarshes on the complex hydrodynamics of the estuary. A coupled flow&#x2013;wave&#x2013;vegetation model, developed using the Delft3D coastal modelling software, was used. The wave and current attenuation role of saltmarshes during two contrasting storm conditions was modelled, with and without saltmarsh management interventions. The study reveals that certain saltmarsh management interventions can have widespread impacts on the hydrodynamics of the estuary. Altering the land use by allowing extensive grazing of saltmarsh by livestock was found to have the largest impact on wave attenuation, where wave heights on the marsh almost doubled when compared with the no-intervention scenario. On the other hand, managed realignment has a significant impact on tidal currents, where tidal currents reached 0.5 m/s at certain locations. Changes in estuarine hydrodynamics can lead to undesired impacts on flooding and erosion, which stresses the importance of understanding the effects of localized anthropogenic coastal management interventions on the entire estuarine system.</abstract><type>Journal Article</type><journal>Journal of Marine Science and Engineering</journal><volume>8</volume><journalNumber>5</journalNumber><paginationStart>373</paginationStart><publisher>MDPI AG</publisher><issnElectronic>2077-1312</issnElectronic><keywords>coastal management; saltmarsh; estuarine hydrodynamics; Delft3D; computational modelling</keywords><publishedDay>23</publishedDay><publishedMonth>5</publishedMonth><publishedYear>2020</publishedYear><publishedDate>2020-05-23</publishedDate><doi>10.3390/jmse8050373</doi><url/><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-08-21T14:50:26.6169585</lastEdited><Created>2020-07-06T12:18:49.1602522</Created><authors><author><firstname>William</firstname><surname>Bennett</surname><orcid>0000-0002-7229-5747</orcid><order>1</order></author><author><firstname>Thomas</firstname><surname>van Veelen</surname><order>2</order></author><author><firstname>Tom</firstname><surname>Fairchild</surname><orcid>0000-0001-7133-8824</orcid><order>3</order></author><author><firstname>John</firstname><surname>Griffin</surname><orcid>0000-0003-3295-6480</orcid><order>4</order></author><author><firstname>Harshinie</firstname><surname>Karunarathna</surname><orcid>0000-0002-9087-3811</orcid><order>5</order></author></authors><documents><document><filename>54650__17647__6c2974cc4c8e4369b2cf29ae25a14051.pdf</filename><originalFilename>54650.pdf</originalFilename><uploaded>2020-07-06T12:21:45.6640013</uploaded><type>Output</type><contentLength>19536824</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><documentNotes>This is an open access article distributed under the Creative Commons Attribution License (CC-BY).</documentNotes><copyrightCorrect>true</copyrightCorrect><language>English</language><licence>https://creativecommons.org/licenses/by/4.0/</licence></document></documents><OutputDurs/></rfc1807>
spelling 2020-08-21T14:50:26.6169585 v2 54650 2020-07-06 Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary 02f99b24e395a83ca52f7b85b151b29b 0000-0002-7229-5747 William Bennett William Bennett true false 8e00d06f3ebcb6f6700e306bd62623ac Thomas van Veelen Thomas van Veelen true false 029ccd52181e00b3711e9234a8d200b7 0000-0001-7133-8824 Tom Fairchild Tom Fairchild true false 9814fbffa76dd9c9a207166354cd0b2f 0000-0003-3295-6480 John Griffin John Griffin true false 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false 2020-07-06 CIVL Saltmarshes are considered as natural coastal defences. However, owing to the large context dependency, there is much discussion over their effectiveness in providing coastal protection and the necessity of additional coastal defence interventions. The macro-tidal Taf Estuary in south-west Wales was chosen as the case study in this paper to investigate the effects of anthropogenic coastal defence interventions such as construction of hard defences, managed realignment, and altering land use of the saltmarshes on the complex hydrodynamics of the estuary. A coupled flow–wave–vegetation model, developed using the Delft3D coastal modelling software, was used. The wave and current attenuation role of saltmarshes during two contrasting storm conditions was modelled, with and without saltmarsh management interventions. The study reveals that certain saltmarsh management interventions can have widespread impacts on the hydrodynamics of the estuary. Altering the land use by allowing extensive grazing of saltmarsh by livestock was found to have the largest impact on wave attenuation, where wave heights on the marsh almost doubled when compared with the no-intervention scenario. On the other hand, managed realignment has a significant impact on tidal currents, where tidal currents reached 0.5 m/s at certain locations. Changes in estuarine hydrodynamics can lead to undesired impacts on flooding and erosion, which stresses the importance of understanding the effects of localized anthropogenic coastal management interventions on the entire estuarine system. Journal Article Journal of Marine Science and Engineering 8 5 373 MDPI AG 2077-1312 coastal management; saltmarsh; estuarine hydrodynamics; Delft3D; computational modelling 23 5 2020 2020-05-23 10.3390/jmse8050373 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-08-21T14:50:26.6169585 2020-07-06T12:18:49.1602522 William Bennett 0000-0002-7229-5747 1 Thomas van Veelen 2 Tom Fairchild 0000-0001-7133-8824 3 John Griffin 0000-0003-3295-6480 4 Harshinie Karunarathna 0000-0002-9087-3811 5 54650__17647__6c2974cc4c8e4369b2cf29ae25a14051.pdf 54650.pdf 2020-07-06T12:21:45.6640013 Output 19536824 application/pdf Version of Record true This is an open access article distributed under the Creative Commons Attribution License (CC-BY). true English https://creativecommons.org/licenses/by/4.0/
title Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
spellingShingle Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
William Bennett
Thomas van Veelen
Tom Fairchild
John Griffin
Harshinie Karunarathna
title_short Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
title_full Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
title_fullStr Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
title_full_unstemmed Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
title_sort Computational Modelling of the Impacts of Saltmarsh Management Interventions on Hydrodynamics of a Small Macro-Tidal Estuary
author_id_str_mv 02f99b24e395a83ca52f7b85b151b29b
8e00d06f3ebcb6f6700e306bd62623ac
029ccd52181e00b3711e9234a8d200b7
9814fbffa76dd9c9a207166354cd0b2f
0d3d327a240d49b53c78e02b7c00e625
author_id_fullname_str_mv 02f99b24e395a83ca52f7b85b151b29b_***_William Bennett
8e00d06f3ebcb6f6700e306bd62623ac_***_Thomas van Veelen
029ccd52181e00b3711e9234a8d200b7_***_Tom Fairchild
9814fbffa76dd9c9a207166354cd0b2f_***_John Griffin
0d3d327a240d49b53c78e02b7c00e625_***_Harshinie Karunarathna
author William Bennett
Thomas van Veelen
Tom Fairchild
John Griffin
Harshinie Karunarathna
author2 William Bennett
Thomas van Veelen
Tom Fairchild
John Griffin
Harshinie Karunarathna
format Journal article
container_title Journal of Marine Science and Engineering
container_volume 8
container_issue 5
container_start_page 373
publishDate 2020
institution Swansea University
issn 2077-1312
doi_str_mv 10.3390/jmse8050373
publisher MDPI AG
document_store_str 1
active_str 0
description Saltmarshes are considered as natural coastal defences. However, owing to the large context dependency, there is much discussion over their effectiveness in providing coastal protection and the necessity of additional coastal defence interventions. The macro-tidal Taf Estuary in south-west Wales was chosen as the case study in this paper to investigate the effects of anthropogenic coastal defence interventions such as construction of hard defences, managed realignment, and altering land use of the saltmarshes on the complex hydrodynamics of the estuary. A coupled flow–wave–vegetation model, developed using the Delft3D coastal modelling software, was used. The wave and current attenuation role of saltmarshes during two contrasting storm conditions was modelled, with and without saltmarsh management interventions. The study reveals that certain saltmarsh management interventions can have widespread impacts on the hydrodynamics of the estuary. Altering the land use by allowing extensive grazing of saltmarsh by livestock was found to have the largest impact on wave attenuation, where wave heights on the marsh almost doubled when compared with the no-intervention scenario. On the other hand, managed realignment has a significant impact on tidal currents, where tidal currents reached 0.5 m/s at certain locations. Changes in estuarine hydrodynamics can lead to undesired impacts on flooding and erosion, which stresses the importance of understanding the effects of localized anthropogenic coastal management interventions on the entire estuarine system.
published_date 2020-05-23T04:08:18Z
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score 11.01353

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