The formation of tidal sand waves: steady versus unsteady approaches / P. Blondeaux in Journal of hydraulic research, Vol. 47 N° 2+ Supplément (Mars/Avril 2009)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 47 N° 2+ Supplément (Mars/Avril 2009) . - pp. 213-222 Titre : The formation of tidal sand waves: steady versus unsteady approaches Titre original : Formation des ondes de sable dues aux marées: approches stationnaire et instationnaire Type de document : texte imprimé Auteurs : P. Blondeaux, Auteur ; G. Vittori, Auteur Année de publication : 2009 Article en page(s) : pp. 213-222 Note générale : Hydraulique Résumé en Français Langues : Anglais (eng) Mots-clés : Bed load Sand waves Suspended Tidal currents Unsteady approach 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 : To investigate the formation of the sand waves generated by tide propagation, the stability of a flat sea bottom forced by tidal currents is often analyzed. Both quasi-steady and unsteady approaches are used. The steady approaches consider a steady current characterized by a slowly varying strength, such that time t is considered as a parameter in the equations describing the phenomenon. The unsteady approaches take into account the unsteadiness of the forcing flow assuming that the terms related to ∂/∂t provide significant contributions to the momentum and sediment balances. Herein, the accuracy of the two classes of approaches is discussed along with the reliability of their predictions. The use of an unsteady approach appears to be necessary when the suspended sediment transport provides a significant contribution to the total load. A simple diagram is presented to evaluate the need of an unsteady approach. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com [article] The formation of tidal sand waves: steady versus unsteady approaches = Formation des ondes de sable dues aux marées: approches stationnaire et instationnaire [texte imprimé] / P. Blondeaux, Auteur ; G. Vittori, Auteur . - 2009 . - pp. 213-222. Hydraulique Résumé en Français Langues : Anglais (eng) in Journal of hydraulic research > Vol. 47 N° 2+ Supplément (Mars/Avril 2009) . - pp. 213-222 Mots-clés : Bed load Sand waves Suspended Tidal currents Unsteady approach 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 : To investigate the formation of the sand waves generated by tide propagation, the stability of a flat sea bottom forced by tidal currents is often analyzed. Both quasi-steady and unsteady approaches are used. The steady approaches consider a steady current characterized by a slowly varying strength, such that time t is considered as a parameter in the equations describing the phenomenon. The unsteady approaches take into account the unsteadiness of the forcing flow assuming that the terms related to ∂/∂t provide significant contributions to the momentum and sediment balances. Herein, the accuracy of the two classes of approaches is discussed along with the reliability of their predictions. The use of an unsteady approach appears to be necessary when the suspended sediment transport provides a significant contribution to the total load. A simple diagram is presented to evaluate the need of an unsteady approach. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.journalhydraulicresearch.com

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