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Wave climate projections along the Indian coast

Piyali Chowdhury, Manasa Ranjan Behera, Dominic Reeve Orcid Logo

International Journal of Climatology

Swansea University Author: Dominic Reeve Orcid Logo

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DOI (Published version): 10.1002/joc.6096

Abstract

Future changes in wave climate will influence the marine ecosystem, coastal erosion, design of coastal defences, operation of near‐ and off‐shore structures, and coastal zone management policies and may further add to the potential vulnerabilities of coastal regions to projected sea level rise. Many...

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Published in: International Journal of Climatology
ISSN: 0899-8418 1097-0088
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50467
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first_indexed 2019-05-22T15:49:08Z
last_indexed 2019-07-18T21:35:32Z
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spelling 2019-07-18T15:37:55.5402638 v2 50467 2019-05-21 Wave climate projections along the Indian coast 3e76fcc2bb3cde4ddee2c8edfd2f0082 0000-0003-1293-4743 Dominic Reeve Dominic Reeve true false 2019-05-21 CIVL Future changes in wave climate will influence the marine ecosystem, coastal erosion, design of coastal defences, operation of near‐ and off‐shore structures, and coastal zone management policies and may further add to the potential vulnerabilities of coastal regions to projected sea level rise. Many studies have reported changes in the global wave characteristics under climate change scenarios, but it is important to project future changes in local/regional wave climate for smooth implementation of policies and preventing severe coastal erosion and flooding. In this study the regional wave climate along the Indian coast for two time slices, 2011–2040 and 2041–2070, is reported using an ensemble of near‐surface winds generated by four different CMIP5 general circulation models (GCMs), under RCP4.5 scenario. Comparison of the wave climate for the two time slices shows an increase in wave heights and periods along much of the Indian coast, with the maximum wave heights increasing by more than 30% in some locations. An important finding is that at most locations along the east coast, wave periods are expected to increase by almost 20%, whereas along the west coast an increase of around 10% is expected. This will alter the distribution of wave energy at the shoreline through changes in wave refraction and diffraction, with potential implications for the performance and design of coastal structures and swash‐aligned beaches. Furthermore, the computations show material changes in the directional distribution of waves. This is particularly important in determining the longshore transport of sediments and can lead to realignment of drift‐aligned beaches, manifesting itself as erosion and/or siltation problems. This study is a preliminary contribution towards regional climate projections for the Indian Ocean region which are needed to plan and mitigate the impacts of future climate change. Journal Article International Journal of Climatology 0899-8418 1097-0088 climate change, coastal vulnerability, dynamical projections, Indian coast, surface ocean, waves wave climate variability 8 5 2019 2019-05-08 10.1002/joc.6096 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2019-07-18T15:37:55.5402638 2019-05-21T13:44:05.4378370 College of Engineering Engineering Piyali Chowdhury 1 Manasa Ranjan Behera 2 Dominic Reeve 0000-0003-1293-4743 3 0050467-21052019135014.pdf chowdhury2019v2.pdf 2019-05-21T13:50:14.0770000 Output 6193054 application/pdf Version of Record true 2019-05-21T00:00:00.0000000 Distributed under the terms of a Creative Commons Attribution CC-BY Licence. true eng
title Wave climate projections along the Indian coast
spellingShingle Wave climate projections along the Indian coast
Dominic Reeve
title_short Wave climate projections along the Indian coast
title_full Wave climate projections along the Indian coast
title_fullStr Wave climate projections along the Indian coast
title_full_unstemmed Wave climate projections along the Indian coast
title_sort Wave climate projections along the Indian coast
author_id_str_mv 3e76fcc2bb3cde4ddee2c8edfd2f0082
author_id_fullname_str_mv 3e76fcc2bb3cde4ddee2c8edfd2f0082_***_Dominic Reeve
author Dominic Reeve
author2 Piyali Chowdhury
Manasa Ranjan Behera
Dominic Reeve
format Journal article
container_title International Journal of Climatology
publishDate 2019
institution Swansea University
issn 0899-8418
1097-0088
doi_str_mv 10.1002/joc.6096
college_str College of Engineering
hierarchytype
hierarchy_top_id collegeofengineering
hierarchy_top_title College of Engineering
hierarchy_parent_id collegeofengineering
hierarchy_parent_title College of Engineering
department_str Engineering{{{_:::_}}}College of Engineering{{{_:::_}}}Engineering
document_store_str 1
active_str 0
description Future changes in wave climate will influence the marine ecosystem, coastal erosion, design of coastal defences, operation of near‐ and off‐shore structures, and coastal zone management policies and may further add to the potential vulnerabilities of coastal regions to projected sea level rise. Many studies have reported changes in the global wave characteristics under climate change scenarios, but it is important to project future changes in local/regional wave climate for smooth implementation of policies and preventing severe coastal erosion and flooding. In this study the regional wave climate along the Indian coast for two time slices, 2011–2040 and 2041–2070, is reported using an ensemble of near‐surface winds generated by four different CMIP5 general circulation models (GCMs), under RCP4.5 scenario. Comparison of the wave climate for the two time slices shows an increase in wave heights and periods along much of the Indian coast, with the maximum wave heights increasing by more than 30% in some locations. An important finding is that at most locations along the east coast, wave periods are expected to increase by almost 20%, whereas along the west coast an increase of around 10% is expected. This will alter the distribution of wave energy at the shoreline through changes in wave refraction and diffraction, with potential implications for the performance and design of coastal structures and swash‐aligned beaches. Furthermore, the computations show material changes in the directional distribution of waves. This is particularly important in determining the longshore transport of sediments and can lead to realignment of drift‐aligned beaches, manifesting itself as erosion and/or siltation problems. This study is a preliminary contribution towards regional climate projections for the Indian Ocean region which are needed to plan and mitigate the impacts of future climate change.
published_date 2019-05-08T04:03:51Z
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