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Modelling of Bimodal Wave Overtopping of Coastal Defences / TUNDE ORIMOLOYE

Swansea University Author: TUNDE ORIMOLOYE

  • E-Thesis – open access under embargo until: 6th July 2025

DOI (Published version): 10.23889/SUthesis.59738

Abstract

Wave overtopping from a few hours of violent storms can cause damage to infrastructure. Extensive knowledge is available on the prediction of wave overtopping of smooth, sloping and vertical impermeable seawalls. However, existing prediction methods provide less certain predictions when the sea stat...

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Published: Swansea 2020
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Reeve, Dominic E. ; Karunarathna, Harshinie
URI: https://cronfa.swan.ac.uk/Record/cronfa59738
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spelling 2022-03-29T15:39:58.8570159 v2 59738 2022-03-29 Modelling of Bimodal Wave Overtopping of Coastal Defences 6b0525f01a5c0478cc82cc07a882ac23 TUNDE ORIMOLOYE TUNDE ORIMOLOYE true false 2022-03-29 Wave overtopping from a few hours of violent storms can cause damage to infrastructure. Extensive knowledge is available on the prediction of wave overtopping of smooth, sloping and vertical impermeable seawalls. However, existing prediction methods provide less certain predictions when the sea state has a bimodal character, such as when there are strong components of both wind and swell. This thesis improves wave overtopping study of seawalls under storm-driven bimodal seas. Firstly, we developed an energy-conserved bimodal spectrum which contains the same energy as the unimodal spectrum derived from a sea state for easy comparison. The peak periods of the bimodal spectrum is occurring at four different spectra peak periods (11, 15, 20 and 25 secs, respectively), swell magnitude is defined with percentages (0, 25, 50, and 75 percentages). Both the unimodal and the bimodal spectra were used to perform wave overtopping experiments in a laboratory tank and numerical flume. Different bimodal spectra were created from the same sea state but the peak periods of the swell in the resulting bimodal spectrum were varied while retaining the same energy content. Bimodal wave sequences are derived from these spectra and used to investigate the overtopping of sloping seawalls. The reflection performances of the impermeable slopes were analysed in present study. The dimensionless overtopping rate for a range of seawalls was measured for bimodal storm conditions of a minimum of 1000 waves. Results for unimodal conditions agree closely with predictions using the EurOtop formulae. The current standard suggested in EurOtop (2018) underpredicts the observed wave overtopping rates for bimodal conditions even when using the recommended parameters for such cases. Under these conditions, it was found that there is a dependence between mean overtopping rate and swell occurrences. New sets of empirical influencing factors to describe these dependencies have been determined in terms of seawall designs at locations that are exposed to local storm waves and open Atlantic oceans. E-Thesis Swansea bimodal waves, wave overtopping, EurOtop, swell, storms, impermeable slopes, reflection, waves hydrodynamics, numerical, experimental 6 7 2020 2020-07-06 10.23889/SUthesis.59738 COLLEGE NANME COLLEGE CODE Swansea University Reeve, Dominic E. ; Karunarathna, Harshinie Doctoral Ph.D PTDF; Grant number: PTDF/ED/OSS/PHD/TOS/842/16 2022-03-29T15:39:58.8570159 2022-03-29T14:51:44.3621469 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised TUNDE ORIMOLOYE 1 Under embargo Under embargo 2022-03-29T15:13:09.7151995 Output 27528638 application/pdf E-Thesis – open access true 2025-07-06T00:00:00.0000000 Copyright: The author, Stephen Tunde Orimoloye, 2020. true eng
title Modelling of Bimodal Wave Overtopping of Coastal Defences
spellingShingle Modelling of Bimodal Wave Overtopping of Coastal Defences
TUNDE ORIMOLOYE
title_short Modelling of Bimodal Wave Overtopping of Coastal Defences
title_full Modelling of Bimodal Wave Overtopping of Coastal Defences
title_fullStr Modelling of Bimodal Wave Overtopping of Coastal Defences
title_full_unstemmed Modelling of Bimodal Wave Overtopping of Coastal Defences
title_sort Modelling of Bimodal Wave Overtopping of Coastal Defences
author_id_str_mv 6b0525f01a5c0478cc82cc07a882ac23
author_id_fullname_str_mv 6b0525f01a5c0478cc82cc07a882ac23_***_TUNDE ORIMOLOYE
author TUNDE ORIMOLOYE
author2 TUNDE ORIMOLOYE
format E-Thesis
publishDate 2020
institution Swansea University
doi_str_mv 10.23889/SUthesis.59738
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 Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 0
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description Wave overtopping from a few hours of violent storms can cause damage to infrastructure. Extensive knowledge is available on the prediction of wave overtopping of smooth, sloping and vertical impermeable seawalls. However, existing prediction methods provide less certain predictions when the sea state has a bimodal character, such as when there are strong components of both wind and swell. This thesis improves wave overtopping study of seawalls under storm-driven bimodal seas. Firstly, we developed an energy-conserved bimodal spectrum which contains the same energy as the unimodal spectrum derived from a sea state for easy comparison. The peak periods of the bimodal spectrum is occurring at four different spectra peak periods (11, 15, 20 and 25 secs, respectively), swell magnitude is defined with percentages (0, 25, 50, and 75 percentages). Both the unimodal and the bimodal spectra were used to perform wave overtopping experiments in a laboratory tank and numerical flume. Different bimodal spectra were created from the same sea state but the peak periods of the swell in the resulting bimodal spectrum were varied while retaining the same energy content. Bimodal wave sequences are derived from these spectra and used to investigate the overtopping of sloping seawalls. The reflection performances of the impermeable slopes were analysed in present study. The dimensionless overtopping rate for a range of seawalls was measured for bimodal storm conditions of a minimum of 1000 waves. Results for unimodal conditions agree closely with predictions using the EurOtop formulae. The current standard suggested in EurOtop (2018) underpredicts the observed wave overtopping rates for bimodal conditions even when using the recommended parameters for such cases. Under these conditions, it was found that there is a dependence between mean overtopping rate and swell occurrences. New sets of empirical influencing factors to describe these dependencies have been determined in terms of seawall designs at locations that are exposed to local storm waves and open Atlantic oceans.
published_date 2020-07-06T04:17:16Z
_version_ 1763754153630236672
score 11.013148

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