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Observations of canonical flow resistance in fast-flowing sand bed rivers / Nicolas Huybrechts in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 611-616 Titre : Observations of canonical flow resistance in fast-flowing sand bed rivers Type de document : texte imprimé Auteurs : Nicolas Huybrechts, Auteur ; Giang Vu Luong, Auteur ; Yuanfeng Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 611-616 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Alluvial  regime  Drag  reduction  In-phase  waves  Mobile  bed  forms  Movable-bed  resistance  Optimum  bed  form  configuration  Separated  and  reattaching  flow  Vortex  drag  model 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 : Field data are here re-interpreted using the Vortex–Drag equation for evaluating the alluvial resistance in a sand bed river. The Vortex–Drag equation introduces the Rossiter resonance concept into alluvial hydraulics. It appears that this equation is more consistent than the Manning approach for the lower alluvial regime since a ripple configuration effectively induces a lower flow resistance coefficient than a duned configuration. A systematic decrease in the control factor down to a canonical value during the transition from the lower to the upper alluvial regime is found for well-contrasted freshet events. It results that during high stream power events with maximum river bed reshaping, the flow pattern is reproduced by simply imposing this canonical value. This is most welcome in alluvial hydraulic routing, because peak-discharge events are generally these which are the most difficult to characterize in a straightforward way, both experimentally and numerically. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596651 [article] Observations of canonical flow resistance in fast-flowing sand bed rivers [texte imprimé] / Nicolas Huybrechts, Auteur ; Giang Vu Luong, Auteur ; Yuanfeng Zhang, Auteur . - 2011 . - pp. 611-616. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 611-616 Mots-clés : Alluvial  regime  Drag  reduction  In-phase  waves  Mobile  bed  forms  Movable-bed  resistance  Optimum  bed  form  configuration  Separated  and  reattaching  flow  Vortex  drag  model 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 : Field data are here re-interpreted using the Vortex–Drag equation for evaluating the alluvial resistance in a sand bed river. The Vortex–Drag equation introduces the Rossiter resonance concept into alluvial hydraulics. It appears that this equation is more consistent than the Manning approach for the lower alluvial regime since a ripple configuration effectively induces a lower flow resistance coefficient than a duned configuration. A systematic decrease in the control factor down to a canonical value during the transition from the lower to the upper alluvial regime is found for well-contrasted freshet events. It results that during high stream power events with maximum river bed reshaping, the flow pattern is reproduced by simply imposing this canonical value. This is most welcome in alluvial hydraulic routing, because peak-discharge events are generally these which are the most difficult to characterize in a straightforward way, both experimentally and numerically. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596651