The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves
An experimental investigation of two-dimensional dispersively focused laboratory breaking waves is presented. We describe the bandwidth effect on breaking wave energetics, including spectral energy evolution, characteristic group velocity, energy dissipation and its rate, and breaking strength param...
| Autores: | , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2023 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/405966 |
| Acceso en línea: | https://hdl.handle.net/2117/405966 https://dx.doi.org/10.1017/jfm.2023.645 |
| Access Level: | acceso abierto |
| Palabra clave: | Wave mechanics Water waves Wave breaking Surface gravity waves Air/sea interactions Mecànica ondulatòria Ones d'aigua Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
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The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking wavesCao, RuiPadilla de la Torre, Enrique Manuel|||0000-0003-0532-8809Callaghan, Adrian H.Wave mechanicsWater wavesWave breakingSurface gravity wavesAir/sea interactionsMecànica ondulatòriaOnes d'aiguaÀrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluidsAn experimental investigation of two-dimensional dispersively focused laboratory breaking waves is presented. We describe the bandwidth effect on breaking wave energetics, including spectral energy evolution, characteristic group velocity, energy dissipation and its rate, and breaking strength parameter, b. To evaluate the role of bandwidth, three definitions of wave group steepness are adopted where Ss and Sn are bandwidth-dependent and Sp remains constant when bandwidth is changed. Our data show two regimes of spectral energy evolution in breaking wave groups, with both regimes bandwidth-dependent: energy dissipation and gain occur at f > 0.95fp ( fp is the peak frequency) and f < 0.95fp, respectively. The characteristic group velocity, which is used in energy dissipation calculations, increases by up to 7 % after wave breaking, being larger for higher bandwidth breaking waves. An unambiguous bandwidth dependence is found between Sp and both the fractional and absolute wave energy dissipation. Wave groups of larger bandwidth break at a lower value of Sp and consequently lose relatively more energy. The energy dissipation rate depends on the breaking duration which itself is bandwidth dependent. Consequently, no clear bandwidth effect is observed in energy dissipation rate when compared with either Sp or Ss. However, there is a systematic bandwidth dependence in the variation of b when parameterised in terms of Sp, with their relationship becoming increasingly nonlinear as bandwidth increases. When parameterised with Ss, b shows a markedly reduced bandwidth dependence. Finally, the numerical breaking onset and relationship between b and Ss in the numerical study of Derakhti & Kirby (J. Fluid Mech., vol. 790, 2016, pp. 553–581) is validated experimentallyThe experiments reported here were funded by the National Science Foundation (grant number OCE-1434866) while A.H.C. was a visiting researcher in the Department of Civil and Environmental Engineering at Imperial College London from 2015 to 2016. A.H.C. received further funding from a Royal Society Shooter International Fellowship and a NERC Standard Grant (grant number NE/T000309/1). While E.M.P. was at Imperial College London, he was supported by NERC (grant number NE/T000309/1). R.C. was supported with a Skempton PhD fellowship from the Department of Civil and Environmental Engineering, Imperial College London20232023-09-2520242024-04-05journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/405966https://dx.doi.org/10.1017/jfm.2023.645reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial 4.0 Internationalhttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4059662026-05-27T15:37:01Z |
| dc.title.none.fl_str_mv |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| title |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| spellingShingle |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves Cao, Rui Wave mechanics Water waves Wave breaking Surface gravity waves Air/sea interactions Mecànica ondulatòria Ones d'aigua Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| title_short |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| title_full |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| title_fullStr |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| title_full_unstemmed |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| title_sort |
The influence of bandwidth on the energetics of intermediate to deep water laboratory breaking waves |
| dc.creator.none.fl_str_mv |
Cao, Rui Padilla de la Torre, Enrique Manuel|||0000-0003-0532-8809 Callaghan, Adrian H. |
| author |
Cao, Rui |
| author_facet |
Cao, Rui Padilla de la Torre, Enrique Manuel|||0000-0003-0532-8809 Callaghan, Adrian H. |
| author_role |
author |
| author2 |
Padilla de la Torre, Enrique Manuel|||0000-0003-0532-8809 Callaghan, Adrian H. |
| author2_role |
author author |
| dc.subject.none.fl_str_mv |
Wave mechanics Water waves Wave breaking Surface gravity waves Air/sea interactions Mecànica ondulatòria Ones d'aigua Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| topic |
Wave mechanics Water waves Wave breaking Surface gravity waves Air/sea interactions Mecànica ondulatòria Ones d'aigua Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| description |
An experimental investigation of two-dimensional dispersively focused laboratory breaking waves is presented. We describe the bandwidth effect on breaking wave energetics, including spectral energy evolution, characteristic group velocity, energy dissipation and its rate, and breaking strength parameter, b. To evaluate the role of bandwidth, three definitions of wave group steepness are adopted where Ss and Sn are bandwidth-dependent and Sp remains constant when bandwidth is changed. Our data show two regimes of spectral energy evolution in breaking wave groups, with both regimes bandwidth-dependent: energy dissipation and gain occur at f > 0.95fp ( fp is the peak frequency) and f < 0.95fp, respectively. The characteristic group velocity, which is used in energy dissipation calculations, increases by up to 7 % after wave breaking, being larger for higher bandwidth breaking waves. An unambiguous bandwidth dependence is found between Sp and both the fractional and absolute wave energy dissipation. Wave groups of larger bandwidth break at a lower value of Sp and consequently lose relatively more energy. The energy dissipation rate depends on the breaking duration which itself is bandwidth dependent. Consequently, no clear bandwidth effect is observed in energy dissipation rate when compared with either Sp or Ss. However, there is a systematic bandwidth dependence in the variation of b when parameterised in terms of Sp, with their relationship becoming increasingly nonlinear as bandwidth increases. When parameterised with Ss, b shows a markedly reduced bandwidth dependence. Finally, the numerical breaking onset and relationship between b and Ss in the numerical study of Derakhti & Kirby (J. Fluid Mech., vol. 790, 2016, pp. 553–581) is validated experimentally |
| publishDate |
2023 |
| dc.date.none.fl_str_mv |
2023 2023-09-25 2024 2024-04-05 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/405966 https://dx.doi.org/10.1017/jfm.2023.645 |
| url |
https://hdl.handle.net/2117/405966 https://dx.doi.org/10.1017/jfm.2023.645 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 Attribution-NonCommercial 4.0 International http://creativecommons.org/licenses/by-nc/4.0/ |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
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reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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