Influence of storm sequencing on breaker bar and shoreline evolution in large-scale experiments
File(s)Manuscript_CENG_2020_accepted.pdf (2.55 MB)
Accepted version
Author(s)
Eichentopf, Sonja
van der Zanden, Joep
Cáceres, Iván
Baldock, Tom E
Alsina, José M
Type
Journal Article
Abstract
New large-scale experiments on the influence of storm sequencing on beach profile evolution are presented. The experiments comprised three sequences that commenced from the same initial beach profile. Each sequence consisted of two storms of different energy, with each storm followed by a recovery phase. A specific focus of the experiments was the influence of storm chronology as well as the influence of the recovery wave energy and duration on beach evolution. The breaker bar and the shoreline are studied as indicators for the beach response. Both evolve towards an equilibrium location for each wave condition where the breaker bar reaches its equilibrium much faster than the shoreline. Overall, no enhanced beach erosion due to storm sequencing is observed. Despite a similar cumulative wave power of the three sequences, the final beach configuration of each sequence seems to be determined by the last wave condition instead of previous storms. However, storm sequencing is important when the beach profile has not yet fully recovered before being disrupted by the subsequent storm. In this case, the second storm does not necessarily cause further erosion but can result in onshore sediment transport and hence, form part of the recovery. The bulk onshore sediment transport as well as the shoreline recovery rate vary depending on the wave condition and the profile disequilibrium and show a maximum value for a recovery condition with an intermediate wave energy. The very low energy condition that was performed for a long duration (24 hours) generated a near-stationary beach profile with typical features of a reflective beach.
Date Issued
2020-04
Date Acceptance
2020-02-02
Citation
Coastal Engineering, 2020, 157, pp.1-15
ISSN
0378-3839
Publisher
Elsevier
Start Page
1
End Page
15
Journal / Book Title
Coastal Engineering
Volume
157
Copyright Statement
© 2020 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S0378383919303023?via%3Dihub
Subjects
0403 Geology
0405 Oceanography
0905 Civil Engineering
Oceanography
Publication Status
Published online
Article Number
103659
Date Publish Online
2020-02-06