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Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach

Shinya Umeda, Masatoshi Yuhi, Harshinie Karunarathna Orcid Logo

Journal of Coastal Research, Volume: 85, Pages: 261 - 265

Swansea University Author: Harshinie Karunarathna Orcid Logo

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DOI (Published version): 10.2112/SI85-053.1

Abstract

Seasonal to decadal variability of shoreline position at a long multi-barred beach with gentle slopes was investigated using a dataset of biannual shoreline surveys of 23 years. An empirical orthogonal function (EOF) and spectral analysis on 15.2 km long stretch were conducted to describe characteri...

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Published in: Journal of Coastal Research
ISSN: 0749-0208 1551-5036
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa43552
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first_indexed 2018-08-23T19:44:05Z
last_indexed 2018-10-09T19:34:53Z
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spelling 2018-10-09T15:39:25.0301567 v2 43552 2018-08-23 Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach 0d3d327a240d49b53c78e02b7c00e625 0000-0002-9087-3811 Harshinie Karunarathna Harshinie Karunarathna true false 2018-08-23 CIVL Seasonal to decadal variability of shoreline position at a long multi-barred beach with gentle slopes was investigated using a dataset of biannual shoreline surveys of 23 years. An empirical orthogonal function (EOF) and spectral analysis on 15.2 km long stretch were conducted to describe characteristic patterns of shoreline variation at multiple scales in time and space. A relatively alongshore uniform shoreline migration toward offshore in summer and onshore in winter was dominant in the first EOF mode which secondarily exhibited a long-term trend of shoreline recession. Mid-term shoreline variations related to shoreline sand wave and longshore sandbars were represented by the combinations of the second to sixth EOF modes filtered through two bands of dominant frequency. The shoreline pattern reconstructed on a longer time scale represented a large scale shoreline undulation whose scale and migration speed were comparable to shoreline sand waves observed in various coasts. On the otherhand, the shoreline pattern reconstructed on a shorter time scale represented alongshore uniform shoreline migration toward onshore and offshore in about five-year cycles, which corresponded to the average cycle of net offshore sandbar migration observed at the site. The periodic shoreline recession-advance related to sandbar migration was estimated to be comparable to seasonal scale shoreline variation. A correlation analysis between seasonal scale shoreline variation and wave statistics exhibited that shoreline advance in summer increased with low wave heights. It was suggested that a moderate waves were responsible for seasonal scale shoreline advance in this coast. Journal Article Journal of Coastal Research 85 261 265 0749-0208 1551-5036 Shoreline change, sandbar migration, EOF analysis, wave conditions 31 12 2018 2018-12-31 10.2112/SI85-053.1 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2018-10-09T15:39:25.0301567 2018-08-23T15:25:48.2401593 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Shinya Umeda 1 Masatoshi Yuhi 2 Harshinie Karunarathna 0000-0002-9087-3811 3
title Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
spellingShingle Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
Harshinie Karunarathna
title_short Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
title_full Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
title_fullStr Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
title_full_unstemmed Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
title_sort Seasonal to Decadal Variability of Shoreline Position on a Multiple Sandbar Beach
author_id_str_mv 0d3d327a240d49b53c78e02b7c00e625
author_id_fullname_str_mv 0d3d327a240d49b53c78e02b7c00e625_***_Harshinie Karunarathna
author Harshinie Karunarathna
author2 Shinya Umeda
Masatoshi Yuhi
Harshinie Karunarathna
format Journal article
container_title Journal of Coastal Research
container_volume 85
container_start_page 261
publishDate 2018
institution Swansea University
issn 0749-0208
1551-5036
doi_str_mv 10.2112/SI85-053.1
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 0
active_str 0
description Seasonal to decadal variability of shoreline position at a long multi-barred beach with gentle slopes was investigated using a dataset of biannual shoreline surveys of 23 years. An empirical orthogonal function (EOF) and spectral analysis on 15.2 km long stretch were conducted to describe characteristic patterns of shoreline variation at multiple scales in time and space. A relatively alongshore uniform shoreline migration toward offshore in summer and onshore in winter was dominant in the first EOF mode which secondarily exhibited a long-term trend of shoreline recession. Mid-term shoreline variations related to shoreline sand wave and longshore sandbars were represented by the combinations of the second to sixth EOF modes filtered through two bands of dominant frequency. The shoreline pattern reconstructed on a longer time scale represented a large scale shoreline undulation whose scale and migration speed were comparable to shoreline sand waves observed in various coasts. On the otherhand, the shoreline pattern reconstructed on a shorter time scale represented alongshore uniform shoreline migration toward onshore and offshore in about five-year cycles, which corresponded to the average cycle of net offshore sandbar migration observed at the site. The periodic shoreline recession-advance related to sandbar migration was estimated to be comparable to seasonal scale shoreline variation. A correlation analysis between seasonal scale shoreline variation and wave statistics exhibited that shoreline advance in summer increased with low wave heights. It was suggested that a moderate waves were responsible for seasonal scale shoreline advance in this coast.
published_date 2018-12-31T03:54:47Z
_version_ 1763752738657665024
score 11.036706

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