Energy dissipation and flow characteristics of baffles and sills on stepped spillways / Hesham K. Zare in Journal of hydraulic research, Vol. 50 N° 2 (Mars/Avril 2012)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 192-199 Titre : Energy dissipation and flow characteristics of baffles and sills on stepped spillways Type de document : texte imprimé Auteurs : Hesham K. Zare, Auteur ; John C. Doering, Auteur Année de publication : 2012 Article en page(s) : pp. 192-199 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Baffle-stepped spillway Cavity End-sill Energy dissipation Flow characteristics Rounded-stepped Sharp-stepped Skimming flow Résumé : In this study, a two-dimensional physical model was used to evaluate the effectiveness of adding baffles and sills at step edges or of shifting them from step edges of a 1V:1H sloping, short, sharp- or round-crested stepped spillway with an ogee inlet. A comparison between different configurations of baffles and sills was carried out with respect to the energy dissipation and the flow characteristics. The baffle-shifted round-crested spillway gives the smallest discharge required for the onset of a skimming flow among all other configurations. The baffle-edged chute dissipates more energy than the sill-edged spillway. Shifting baffles or sills from the sharp edges decreases the energy dissipation. Shifting baffles or sills from the round-crested spillway increases the energy dissipation in the range of the discharges studied. Empirical equations for energy dissipation are introduced for practical application of spillways of comparable similar conditions. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.659840 [article] Energy dissipation and flow characteristics of baffles and sills on stepped spillways [texte imprimé] / Hesham K. Zare, Auteur ; John C. Doering, Auteur . - 2012 . - pp. 192-199. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 2 (Mars/Avril 2012) . - pp. 192-199 Mots-clés : Baffle-stepped spillway Cavity End-sill Energy dissipation Flow characteristics Rounded-stepped Sharp-stepped Skimming flow Résumé : In this study, a two-dimensional physical model was used to evaluate the effectiveness of adding baffles and sills at step edges or of shifting them from step edges of a 1V:1H sloping, short, sharp- or round-crested stepped spillway with an ogee inlet. A comparison between different configurations of baffles and sills was carried out with respect to the energy dissipation and the flow characteristics. The baffle-shifted round-crested spillway gives the smallest discharge required for the onset of a skimming flow among all other configurations. The baffle-edged chute dissipates more energy than the sill-edged spillway. Shifting baffles or sills from the sharp edges decreases the energy dissipation. Shifting baffles or sills from the round-crested spillway increases the energy dissipation in the range of the discharges studied. Empirical equations for energy dissipation are introduced for practical application of spillways of comparable similar conditions. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2012.659840

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