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Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities

William Bennett Orcid Logo, Harshinie Karunarathna Orcid Logo, Dominic Reeve Orcid Logo, Nobuhito Mori

Marine Geology, Volume: 415, Start page: 105960

Swansea University Authors: William Bennett Orcid Logo, Harshinie Karunarathna Orcid Logo, Dominic Reeve Orcid Logo

Abstract

Global climate variabilities have the potential to impact many coastlines around the world, and can have detrimental effects on the stability of coastlines and their function as natural coastal defenses. This paper investigates the impacts of future extreme storms and sea level rise on morphodynamic...

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Published in: Marine Geology
ISSN: 0025-3227
Published: Elsevier BV 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50806
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This paper investigates the impacts of future extreme storms and sea level rise on morphodynamics of the macro-tidal Sefton Coast, UK, taking a process-based model as a tool to simulate a snap-shot of future beach change during storms. Sefton Coast represents one of the largest dune systems in the UK where frontal dunes function as a natural barrier against extreme conditions. Future storm conditions were determined from global predictions of future waves at the end of the twenty first century. Future sea levels were determined based on climate change allowances set by the UK Environment Agency (EA), while future surge conditions were determined based on the guidelines also provided by EA.A nested numerical modelling approach, that combined a regional scale model with a local scale model with high resolution, is used. The modelling suite was first validated against measured waves, water levels and beach change, before using it to simulate morphodynamic change from numerous statistically significant &#x2018;future&#x2019; storm conditions. Future storm-induced morphodynamic change of the Sefton coast was then compared with that from the present storms. The results reveal that this beach will experience significant climate change driven impacts where dune retreat during storms will be considerably higher in future. The results also reveal that due to the shape of the beach and its orientation to predominant wave approach direction, there will be a strong longshore variability of morphodynamic response to storms. It was also found that the water level in front of the dune (and hence surge and future sea level rise) is the most critical factor that determines beach erosion during a storm.</abstract><type>Journal Article</type><journal>Marine Geology</journal><volume>415</volume><paginationStart>105960</paginationStart><publisher>Elsevier BV</publisher><issnPrint>0025-3227</issnPrint><keywords>Morphodynamic Modelling, XBeach, Climate Change, Dune Erosion, Sefton Coast, Extreme Storms, Macro-tidal beach</keywords><publishedDay>1</publishedDay><publishedMonth>9</publishedMonth><publishedYear>2019</publishedYear><publishedDate>2019-09-01</publishedDate><doi>10.1016/j.margeo.2019.105960</doi><url/><notes/><college>COLLEGE NANME</college><department>Civil Engineering</department><CollegeCode>COLLEGE CODE</CollegeCode><DepartmentCode>CIVL</DepartmentCode><institution>Swansea University</institution><apcterm/><lastEdited>2020-10-19T19:04:41.5325109</lastEdited><Created>2019-06-12T15:48:35.8172632</Created><path><level id="1">Faculty of Science and Engineering</level><level id="2">School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering</level></path><authors><author><firstname>William</firstname><surname>Bennett</surname><orcid>0000-0002-7229-5747</orcid><order>1</order></author><author><firstname>Harshinie</firstname><surname>Karunarathna</surname><orcid>0000-0002-9087-3811</orcid><order>2</order></author><author><firstname>Dominic</firstname><surname>Reeve</surname><orcid>0000-0003-1293-4743</orcid><order>3</order></author><author><firstname>Nobuhito</firstname><surname>Mori</surname><order>4</order></author></authors><documents><document><filename>0050806-04072019091656.pdf</filename><originalFilename>bennett2019(2).pdf</originalFilename><uploaded>2019-07-04T09:16:56.5200000</uploaded><type>Output</type><contentLength>3573530</contentLength><contentType>application/pdf</contentType><version>Version of Record</version><cronfaStatus>true</cronfaStatus><embargoDate>2019-07-04T00:00:00.0000000</embargoDate><copyrightCorrect>false</copyrightCorrect><language>eng</language></document></documents><OutputDurs/></rfc1807>
spelling 2020-10-19T19:04:41.5325109 v2 50806 2019-06-12 Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities 02f99b24e395a83ca52f7b85b151b29b 0000-0002-7229-5747 William Bennett William Bennett true false 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false 3e76fcc2bb3cde4ddee2c8edfd2f0082 0000-0003-1293-4743 Dominic Reeve Dominic Reeve true false 2019-06-12 CIVL Global climate variabilities have the potential to impact many coastlines around the world, and can have detrimental effects on the stability of coastlines and their function as natural coastal defenses. This paper investigates the impacts of future extreme storms and sea level rise on morphodynamics of the macro-tidal Sefton Coast, UK, taking a process-based model as a tool to simulate a snap-shot of future beach change during storms. Sefton Coast represents one of the largest dune systems in the UK where frontal dunes function as a natural barrier against extreme conditions. Future storm conditions were determined from global predictions of future waves at the end of the twenty first century. Future sea levels were determined based on climate change allowances set by the UK Environment Agency (EA), while future surge conditions were determined based on the guidelines also provided by EA.A nested numerical modelling approach, that combined a regional scale model with a local scale model with high resolution, is used. The modelling suite was first validated against measured waves, water levels and beach change, before using it to simulate morphodynamic change from numerous statistically significant ‘future’ storm conditions. Future storm-induced morphodynamic change of the Sefton coast was then compared with that from the present storms. The results reveal that this beach will experience significant climate change driven impacts where dune retreat during storms will be considerably higher in future. The results also reveal that due to the shape of the beach and its orientation to predominant wave approach direction, there will be a strong longshore variability of morphodynamic response to storms. It was also found that the water level in front of the dune (and hence surge and future sea level rise) is the most critical factor that determines beach erosion during a storm. Journal Article Marine Geology 415 105960 Elsevier BV 0025-3227 Morphodynamic Modelling, XBeach, Climate Change, Dune Erosion, Sefton Coast, Extreme Storms, Macro-tidal beach 1 9 2019 2019-09-01 10.1016/j.margeo.2019.105960 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2020-10-19T19:04:41.5325109 2019-06-12T15:48:35.8172632 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering William Bennett 0000-0002-7229-5747 1 Harshinie Karunarathna 0000-0002-9087-3811 2 Dominic Reeve 0000-0003-1293-4743 3 Nobuhito Mori 4 0050806-04072019091656.pdf bennett2019(2).pdf 2019-07-04T09:16:56.5200000 Output 3573530 application/pdf Version of Record true 2019-07-04T00:00:00.0000000 false eng
title Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
spellingShingle Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
William Bennett
Harshinie Karunarathna
Dominic Reeve
title_short Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
title_full Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
title_fullStr Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
title_full_unstemmed Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
title_sort Computational modelling of morphodynamic response of a macro-tidal beach to future climate variabilities
author_id_str_mv 02f99b24e395a83ca52f7b85b151b29b
0d3d327a240d49b53c78e02b7c00e625
3e76fcc2bb3cde4ddee2c8edfd2f0082
author_id_fullname_str_mv 02f99b24e395a83ca52f7b85b151b29b_***_William Bennett
0d3d327a240d49b53c78e02b7c00e625_***_Harshinie Karunarathna
3e76fcc2bb3cde4ddee2c8edfd2f0082_***_Dominic Reeve
author William Bennett
Harshinie Karunarathna
Dominic Reeve
author2 William Bennett
Harshinie Karunarathna
Dominic Reeve
Nobuhito Mori
format Journal article
container_title Marine Geology
container_volume 415
container_start_page 105960
publishDate 2019
institution Swansea University
issn 0025-3227
doi_str_mv 10.1016/j.margeo.2019.105960
publisher Elsevier BV
college_str Faculty of Science and Engineering
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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
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description Global climate variabilities have the potential to impact many coastlines around the world, and can have detrimental effects on the stability of coastlines and their function as natural coastal defenses. This paper investigates the impacts of future extreme storms and sea level rise on morphodynamics of the macro-tidal Sefton Coast, UK, taking a process-based model as a tool to simulate a snap-shot of future beach change during storms. Sefton Coast represents one of the largest dune systems in the UK where frontal dunes function as a natural barrier against extreme conditions. Future storm conditions were determined from global predictions of future waves at the end of the twenty first century. Future sea levels were determined based on climate change allowances set by the UK Environment Agency (EA), while future surge conditions were determined based on the guidelines also provided by EA.A nested numerical modelling approach, that combined a regional scale model with a local scale model with high resolution, is used. The modelling suite was first validated against measured waves, water levels and beach change, before using it to simulate morphodynamic change from numerous statistically significant ‘future’ storm conditions. Future storm-induced morphodynamic change of the Sefton coast was then compared with that from the present storms. The results reveal that this beach will experience significant climate change driven impacts where dune retreat during storms will be considerably higher in future. The results also reveal that due to the shape of the beach and its orientation to predominant wave approach direction, there will be a strong longshore variability of morphodynamic response to storms. It was also found that the water level in front of the dune (and hence surge and future sea level rise) is the most critical factor that determines beach erosion during a storm.
published_date 2019-09-01T03:56:16Z
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