[article]
| Titre : |
Observations on undular hydraulic jump in movable bed |
| Type de document : |
texte imprimé |
| Auteurs : |
Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur |
| Année de publication : |
2011 |
| Article en page(s) : |
pp. 689-692 |
| Note générale : |
Hydraulique |
| Langues : |
Anglais (eng) |
| Mots-clés : |
Boundary layer Hydraulic jump Shear stress Transitional flow Turbulence Undular |
| 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 : |
Near-critical flows in rivers and natural streams usually present a wavelike undular free surface, associated with dune-type bed-forms. The formation of this particular bed geometry is related to the shear stress acting on the river bed. The boundary shear stress distribution of undular flows was considered by Engelund and Hansen, stating that standing waves and their associated non-uniform shear stresses are responsible for bed-form generation in rivers. However, observations on movable-bed channels involving transcritical flow were not considered. In this note, an exploratory analysis is conducted to outline the analogy between the boundary shear in fixed-bed undular flows and the bed-form shape. Experimental observations reveal a strong analogy, supporting the original hypothesis of Engelund and Hansen. |
| DEWEY : |
627 |
| ISSN : |
0022-1686 |
| En ligne : |
http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.593879 |
in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 689-692
[article] Observations on undular hydraulic jump in movable bed [texte imprimé] / Oscar Castro-Orgaz, Auteur ; Willi H. Hager, Auteur . - 2011 . - pp. 689-692. Hydraulique Langues : Anglais ( eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 689-692
| Mots-clés : |
Boundary layer Hydraulic jump Shear stress Transitional flow Turbulence Undular |
| 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 : |
Near-critical flows in rivers and natural streams usually present a wavelike undular free surface, associated with dune-type bed-forms. The formation of this particular bed geometry is related to the shear stress acting on the river bed. The boundary shear stress distribution of undular flows was considered by Engelund and Hansen, stating that standing waves and their associated non-uniform shear stresses are responsible for bed-form generation in rivers. However, observations on movable-bed channels involving transcritical flow were not considered. In this note, an exploratory analysis is conducted to outline the analogy between the boundary shear in fixed-bed undular flows and the bed-form shape. Experimental observations reveal a strong analogy, supporting the original hypothesis of Engelund and Hansen. |
| DEWEY : |
627 |
| ISSN : |
0022-1686 |
| En ligne : |
http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.593879 |
|
Observations on undular hydraulic jump in movable bed in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011)
