Division of critical flow at three-branch open-channel intersection / Kamal El Kadi Abderrezzak in Journal of hydraulic research, Vol. 49 N° 2 (Mars/Avril 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 231-238 Titre : Division of critical flow at three-branch open-channel intersection Type de document : texte imprimé Auteurs : Kamal El Kadi Abderrezzak, Auteur ; Leszek Lewicki, Auteur ; André Paquier, Auteur Année de publication : 2011 Article en page(s) : pp. 231-238 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Channel intersection Depth-averaged model Dividing flow Laboratory experiment Open channel junction Transcritical 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 : An experimental study of the characteristics of dividing critical flows in a 90° open-channel junction formed by three horizontal equal-width branches is presented, conducted for various inflow discharges and downstream boundary conditions. Outflow discharges and flow depths were also measured. Four main flow patterns are identified considering the location and length of the hydraulic jumps that develop across the main and lateral channels. A relationship between the discharge division ratio and the tailwater Froude number is found, reproducing well the experimental data. Practical applications of this relationship include the design of open channel and pipe networks and one-dimensional numerical modelling of flood propagation in urban areas. The study shows also that a two-dimensional depth-averaged numerical model hardly gives better predictions of the discharge ratios because of the presence of three-dimensional features at the junction. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.558174 [article] Division of critical flow at three-branch open-channel intersection [texte imprimé] / Kamal El Kadi Abderrezzak, Auteur ; Leszek Lewicki, Auteur ; André Paquier, Auteur . - 2011 . - pp. 231-238. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 231-238 Mots-clés : Channel intersection Depth-averaged model Dividing flow Laboratory experiment Open channel junction Transcritical 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 : An experimental study of the characteristics of dividing critical flows in a 90° open-channel junction formed by three horizontal equal-width branches is presented, conducted for various inflow discharges and downstream boundary conditions. Outflow discharges and flow depths were also measured. Four main flow patterns are identified considering the location and length of the hydraulic jumps that develop across the main and lateral channels. A relationship between the discharge division ratio and the tailwater Froude number is found, reproducing well the experimental data. Practical applications of this relationship include the design of open channel and pipe networks and one-dimensional numerical modelling of flood propagation in urban areas. The study shows also that a two-dimensional depth-averaged numerical model hardly gives better predictions of the discharge ratios because of the presence of three-dimensional features at the junction. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.558174

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