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Future wave-climate driven longshore sediment transport along the Indian coast

Piyali Chowdhury, Manasa Ranjan Behera, Dominic Reeve Orcid Logo

Climatic Change

Swansea University Author: Dominic Reeve Orcid Logo

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DOI (Published version): 10.1007/s10584-020-02693-7

Abstract

Longshore sediment transport is an important nearshore process that governs coastal erosion/accretion and in turn defines the orientation of coastlines. In this study, we assess the changes in longshore transport rates along the Indian coast due to the potential changes in wave parameters under the...

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Published in: Climatic Change
ISSN: 0165-0009 1573-1480
Published: Springer Science and Business Media LLC 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa53953
first_indexed 2020-04-16T19:42:22Z
last_indexed 2020-05-15T13:07:20Z
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spelling 2020-05-15T11:43:02.6463966 v2 53953 2020-04-16 Future wave-climate driven longshore sediment transport along the Indian coast 3e76fcc2bb3cde4ddee2c8edfd2f0082 0000-0003-1293-4743 Dominic Reeve Dominic Reeve true false 2020-04-16 ACEM Longshore sediment transport is an important nearshore process that governs coastal erosion/accretion and in turn defines the orientation of coastlines. In this study, we assess the changes in longshore transport rates along the Indian coast due to the potential changes in wave parameters under the RCP4.5 climate scenario. The projected wave climate for two time slices, ‘near-term/present’ (2011–2040) and ‘mid-term/future’ (2041–2070) were used to investigate changes in the corresponding sediment transport rates. An empirical model accounting for major wave parameters, longshore current, resulting sediment transport and shoreline evolution was used. It was found that most of the Indian coast exhibited the same drift direction in both time slices, although changes in transport magnitude were present. To give a broad-brush characterisation of the coastline, the shoreline elements were classified as erosive, accretive or stable based on the comparative longshore transport rates of neighbouring elements. Similar characterisations, carried out for both time slices, showed that about 35% of the total coastline would remain unaffected due to the changing wave climate in the future (i.e. there is little to no change); about 20% is expected to ‘worsen’ (i.e. expected to undergo higher magnitudes of erosion wrt present rate) and 45% to ‘improve’ (i.e. expected to accrete/reach stability). It was also observed that the net annual transport rates pertaining to the future period are not expected to change significantly with respect to the current scenario. This indicates that the change in longshore transport rates arising from future changes in wave climate as represented by the RCP4.5 climate change scenario will have a broadly neutral effect. Journal Article Climatic Change Springer Science and Business Media LLC 0165-0009 1573-1480 Climate change; Wave climate; Longshore sediment transport; Coastal vulnerabilityIndian coast 20 3 2020 2020-03-20 10.1007/s10584-020-02693-7 COLLEGE NANME Aerospace, Civil, Electrical, and Mechanical Engineering COLLEGE CODE ACEM Swansea University 2020-05-15T11:43:02.6463966 2020-04-16T09:11:21.4241206 Piyali Chowdhury 1 Manasa Ranjan Behera 2 Dominic Reeve 0000-0003-1293-4743 3 53953__17077__646495c1480648189e8f30a33de1eb4f.pdf 53953.pdf 2020-04-17T08:46:26.7476885 Output 1680381 application/pdf Accepted Manuscript true 2021-03-20T00:00:00.0000000 true eng
title Future wave-climate driven longshore sediment transport along the Indian coast
spellingShingle Future wave-climate driven longshore sediment transport along the Indian coast
Dominic Reeve
title_short Future wave-climate driven longshore sediment transport along the Indian coast
title_full Future wave-climate driven longshore sediment transport along the Indian coast
title_fullStr Future wave-climate driven longshore sediment transport along the Indian coast
title_full_unstemmed Future wave-climate driven longshore sediment transport along the Indian coast
title_sort Future wave-climate driven longshore sediment transport 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 Climatic Change
publishDate 2020
institution Swansea University
issn 0165-0009
1573-1480
doi_str_mv 10.1007/s10584-020-02693-7
publisher Springer Science and Business Media LLC
document_store_str 1
active_str 0
description Longshore sediment transport is an important nearshore process that governs coastal erosion/accretion and in turn defines the orientation of coastlines. In this study, we assess the changes in longshore transport rates along the Indian coast due to the potential changes in wave parameters under the RCP4.5 climate scenario. The projected wave climate for two time slices, ‘near-term/present’ (2011–2040) and ‘mid-term/future’ (2041–2070) were used to investigate changes in the corresponding sediment transport rates. An empirical model accounting for major wave parameters, longshore current, resulting sediment transport and shoreline evolution was used. It was found that most of the Indian coast exhibited the same drift direction in both time slices, although changes in transport magnitude were present. To give a broad-brush characterisation of the coastline, the shoreline elements were classified as erosive, accretive or stable based on the comparative longshore transport rates of neighbouring elements. Similar characterisations, carried out for both time slices, showed that about 35% of the total coastline would remain unaffected due to the changing wave climate in the future (i.e. there is little to no change); about 20% is expected to ‘worsen’ (i.e. expected to undergo higher magnitudes of erosion wrt present rate) and 45% to ‘improve’ (i.e. expected to accrete/reach stability). It was also observed that the net annual transport rates pertaining to the future period are not expected to change significantly with respect to the current scenario. This indicates that the change in longshore transport rates arising from future changes in wave climate as represented by the RCP4.5 climate change scenario will have a broadly neutral effect.
published_date 2020-03-20T07:53:32Z
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