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Wave–current interaction at an angle. 1, Experiment / Pradeep C. Fernando 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 424-436 Titre : Wave–current interaction at an angle. 1, Experiment Type de document : texte imprimé Auteurs : Pradeep C. Fernando, Auteur ; Junke Guo, Auteur ; Pengzhi Lin, Auteur Année de publication : 2011 Article en page(s) : pp 424-436 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bed  roughness  Bed  shear  stress  Theoretical  model  Velocity  distribution  Wave–current  interaction 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 : This research presents an experimental study in a spatial wave basin for nonlinear interaction of regular waves with a perpendicular shear current over a movable bed. Detailed measurements were collected for current velocity profiles under different conditions, from which the bed shear stress and apparent roughness heights were determined. These combined with the measured velocities were used to validate theoretical models for wave–current interaction at an angle. It is found that for small wave heights all models agree well with the measured mean current velocities in the combined flow, while for larger wave heights only two models are reasonably close to the measurements for current velocities. For very large waves none of the models adequately describes the near-surface current velocities, which deviate significantly from the log-law. For the bed shear stress and the apparent roughness, only one model describes the measured data well. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.547036 [article] Wave–current interaction at an angle. 1, Experiment [texte imprimé] / Pradeep C. Fernando, Auteur ; Junke Guo, Auteur ; Pengzhi Lin, Auteur . - 2011 . - pp 424-436. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 4 (Juillet/Août 2011) . - pp 424-436 Mots-clés : Bed  roughness  Bed  shear  stress  Theoretical  model  Velocity  distribution  Wave–current  interaction 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 : This research presents an experimental study in a spatial wave basin for nonlinear interaction of regular waves with a perpendicular shear current over a movable bed. Detailed measurements were collected for current velocity profiles under different conditions, from which the bed shear stress and apparent roughness heights were determined. These combined with the measured velocities were used to validate theoretical models for wave–current interaction at an angle. It is found that for small wave heights all models agree well with the measured mean current velocities in the combined flow, while for larger wave heights only two models are reasonably close to the measurements for current velocities. For very large waves none of the models adequately describes the near-surface current velocities, which deviate significantly from the log-law. For the bed shear stress and the apparent roughness, only one model describes the measured data well. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2010.547036

Wave–current interaction at an angle. 2, Theory / Pradeep C. Fernando 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. 437-449 Titre : Wave–current interaction at an angle. 2, Theory Type de document : texte imprimé Auteurs : Pradeep C. Fernando, Auteur ; Pengzhi Lin, Auteur ; Junke Guo, Auteur Année de publication : 2011 Article en page(s) : pp. 437-449 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bed  roughness  Bed  shear  stress  Theoretical  model  Velocity  distribution  Wave–current  interaction 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 theoretical model is presented to describe the current velocity within and outside a wave–current boundary layer and to quantify the associated bed shear stresses for wave–current interaction at an arbitrary angle. The model assumes that the wave-induced bed shear stress in the combined flow varies sinusoidally with time while the current-induced bed shear stress follows an eddy viscosity concept. The computational procedure is given for both depth-averaged and reference-point current-based computations. Unlike other analytical models proposing different coefficients for different problems, the present model uses the same set of equations and coefficients to describe wave–current flows at any angle under any flow regime. This model agrees better with both field measurements and laboratory data than existing theoretical models. The model indicates that the wave–current interaction angle is not significant for wave–current flow properties. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.574388 [article] Wave–current interaction at an angle. 2, Theory [texte imprimé] / Pradeep C. Fernando, Auteur ; Pengzhi Lin, Auteur ; Junke Guo, Auteur . - 2011 . - pp. 437-449. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 4 (Juillet/Août 2011) . - pp. 437-449 Mots-clés : Bed  roughness  Bed  shear  stress  Theoretical  model  Velocity  distribution  Wave–current  interaction 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 theoretical model is presented to describe the current velocity within and outside a wave–current boundary layer and to quantify the associated bed shear stresses for wave–current interaction at an arbitrary angle. The model assumes that the wave-induced bed shear stress in the combined flow varies sinusoidally with time while the current-induced bed shear stress follows an eddy viscosity concept. The computational procedure is given for both depth-averaged and reference-point current-based computations. Unlike other analytical models proposing different coefficients for different problems, the present model uses the same set of equations and coefficients to describe wave–current flows at any angle under any flow regime. This model agrees better with both field measurements and laboratory data than existing theoretical models. The model indicates that the wave–current interaction angle is not significant for wave–current flow properties. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.574388