Experimental investigation of the harmonic generation by waves over a submerged plate
Identifieur interne : 000F67 ( France/Analysis ); précédent : 000F66; suivant : 000F68Experimental investigation of the harmonic generation by waves over a submerged plate
Auteurs : J. Brossard [France] ; M. Chagdali [Maroc]Source :
- Coastal Engineering [ 0378-3839 ] ; 2001.
Abstract
Experiments in a wave flume have been performed to analyse the nonlinear interaction between regular gravity waves and a submerged horizontal plate used as breakwater. A new method, based on the Doppler shift generated by a moving probes, has been used to discriminate the incident fundamental mode and the reflected fundamental mode. The relationships of the reflection and transmission coefficients to the wave number at different submergence depth ratios are presented. The accurate discrimination, by this method, of the phase-locked and free modes allows the quantification of the higher harmonics generated by the breakwater and the analysis of the nonlinear interaction between the waves and the submerged plate. The transfer of energy from the fundamental mode to higher harmonics is very large in the cases of small submergence depth ratios. The vortices produced at the edges take part in the production of higher harmonics by interaction with the free surface but involve, at the same time, a dissipation process that increases the efficiency of the breakwater.
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DOI: 10.1016/S0378-3839(00)00064-8
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Brossard</name><affiliation wicri:level="4"><country xml:lang="fr">France</country><wicri:regionArea>Laboratoire de Mécanique, Faculté des Sciences et Techniques, Université du Havre, 25 rue P. Lebon, BP 540, 76058 Le Havre Cedex</wicri:regionArea><placeName><region type="region" nuts="2">Région Normandie</region><region type="old region" nuts="2">Haute-Normandie</region><settlement type="city">Le Havre</settlement></placeName><orgName type="university">Université du Havre</orgName></affiliation><affiliation></affiliation><affiliation wicri:level="1"><country wicri:rule="url">France</country></affiliation></author><author><name sortKey="Chagdali, M" sort="Chagdali, M" uniqKey="Chagdali M" first="M." last="Chagdali">M. 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A new method, based on the Doppler shift generated by a moving probes, has been used to discriminate the incident fundamental mode and the reflected fundamental mode. The relationships of the reflection and transmission coefficients to the wave number at different submergence depth ratios are presented. The accurate discrimination, by this method, of the phase-locked and free modes allows the quantification of the higher harmonics generated by the breakwater and the analysis of the nonlinear interaction between the waves and the submerged plate. The transfer of energy from the fundamental mode to higher harmonics is very large in the cases of small submergence depth ratios. The vortices produced at the edges take part in the production of higher harmonics by interaction with the free surface but involve, at the same time, a dissipation process that increases the efficiency of the breakwater.</div></front></TEI><affiliations><list><country><li>France</li><li>Maroc</li></country><region><li>Haute-Normandie</li><li>Région Normandie</li></region><settlement><li>Le Havre</li></settlement><orgName><li>Université du Havre</li></orgName></list><tree><country name="France"><region name="Région Normandie"><name sortKey="Brossard, J" sort="Brossard, J" uniqKey="Brossard J" first="J." last="Brossard">J. Brossard</name></region><name sortKey="Brossard, J" sort="Brossard, J" uniqKey="Brossard J" first="J." last="Brossard">J. Brossard</name></country><country name="Maroc"><noRegion><name sortKey="Chagdali, M" sort="Chagdali, M" uniqKey="Chagdali M" first="M." last="Chagdali">M. Chagdali</name></noRegion><name sortKey="Chagdali, M" sort="Chagdali, M" uniqKey="Chagdali M" first="M." last="Chagdali">M. Chagdali</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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