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Sediment transport in nonlinear skewed oscillatory flows / Paulo A. Silva in Journal of hydraulic research, Vol. 49 Supplément 1 (2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 Supplément 1 (2011) . - pp. 72-80 Titre : Sediment transport in nonlinear skewed oscillatory flows : transkew experiments Type de document : texte imprimé Auteurs : Paulo A. Silva, Auteur ; Tiago Abreu, Auteur ; Francisco Sancho, Auteur Année de publication : 2012 Article en page(s) : pp. 72-80 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Flow  acceleration  Sediment  transport  Sheet  flow  Wave  asymmetry  Wave  skewness 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 : New experiments under sheet flow conditions were conducted in an oscillating water tunnel to study the effects of flow acceleration on sand transport. The simulated hydrodynamic conditions considered flow patterns that drive cross-shore sediment transport in the nearshore zone: the wave nonlinearities associated with velocity and acceleration skewness and a negative mean current, the undertow. Net transport rates were evaluated from the sediment balance equation and show that (1) the acceleration skewness in an oscillatory flow produces a net sediment transport in the direction of the highest acceleration; (2) the net transport in the presence of an opposing current is negative, against the direction of the highest acceleration, and reduces with an increase in flow acceleration; and (3) velocity skewness increases the values of the net onshore transport rates. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.592681 [article] Sediment transport in nonlinear skewed oscillatory flows : transkew experiments [texte imprimé] / Paulo A. Silva, Auteur ; Tiago Abreu, Auteur ; Francisco Sancho, Auteur . - 2012 . - pp. 72-80. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 Supplément 1 (2011) . - pp. 72-80 Mots-clés : Flow  acceleration  Sediment  transport  Sheet  flow  Wave  asymmetry  Wave  skewness 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 : New experiments under sheet flow conditions were conducted in an oscillating water tunnel to study the effects of flow acceleration on sand transport. The simulated hydrodynamic conditions considered flow patterns that drive cross-shore sediment transport in the nearshore zone: the wave nonlinearities associated with velocity and acceleration skewness and a negative mean current, the undertow. Net transport rates were evaluated from the sediment balance equation and show that (1) the acceleration skewness in an oscillatory flow produces a net sediment transport in the direction of the highest acceleration; (2) the net transport in the presence of an opposing current is negative, against the direction of the highest acceleration, and reduces with an increase in flow acceleration; and (3) velocity skewness increases the values of the net onshore transport rates. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.592681