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Comparative analysis of sea wave dissipation induced by three flow mechanisms / Matteo Postacchini in Journal of hydraulic research, Vol. 49 N° 4 (Juillet/Août 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 4 (Juillet/Août 2011) . - pp. 554-561 Titre : Comparative analysis of sea wave dissipation induced by three flow mechanisms Type de document : texte imprimé Auteurs : Matteo Postacchini, Auteur ; Maurizio Brocchini, Auteur ; Sara Corvaro, Auteur Année de publication : 2011 Article en page(s) : pp. 554-561 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Breaking  Coastal  protection  Experimentation  Porosity  Roughness  Wave  dissipation Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : A comparative analysis is performed on the wave energy dissipation efficiency on various coastal protection devices. In-house experimental data on the performance of two innovative coastal defence methods and of traditional submerged breakwaters have been used. The analysis provides a quantitative comparison of the efficiency of wave dissipators based on either wave-breaking turbulence, near-bed turbulence, or inside-seabed turbulence decay. The comparison is made on the basis of wave height decay patterns described as a function of suitable dimensionless parameters. The dimensionless volume of maximum turbulence decay is found to be a useful parameter for the analysis. Efficiencies in reducing the intensity of the incident waves are measured by the wave transmission coefficient, which is found to range between 0.4 and 1.0. Submerged breakwaters were found to be the most efficient wave dissipators, especially for large waves, while comparable efficiencies are provided by the three mechanisms under analysis if the flow is forced by moderate waves. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.544143 [article] Comparative analysis of sea wave dissipation induced by three flow mechanisms [texte imprimé] / Matteo Postacchini, Auteur ; Maurizio Brocchini, Auteur ; Sara Corvaro, Auteur . - 2011 . - pp. 554-561. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 4 (Juillet/Août 2011) . - pp. 554-561 Mots-clés : Breaking  Coastal  protection  Experimentation  Porosity  Roughness  Wave  dissipation Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : A comparative analysis is performed on the wave energy dissipation efficiency on various coastal protection devices. In-house experimental data on the performance of two innovative coastal defence methods and of traditional submerged breakwaters have been used. The analysis provides a quantitative comparison of the efficiency of wave dissipators based on either wave-breaking turbulence, near-bed turbulence, or inside-seabed turbulence decay. The comparison is made on the basis of wave height decay patterns described as a function of suitable dimensionless parameters. The dimensionless volume of maximum turbulence decay is found to be a useful parameter for the analysis. Efficiencies in reducing the intensity of the incident waves are measured by the wave transmission coefficient, which is found to range between 0.4 and 1.0. Submerged breakwaters were found to be the most efficient wave dissipators, especially for large waves, while comparable efficiencies are provided by the three mechanisms under analysis if the flow is forced by moderate waves. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.544143