Friction factor and von Kármán's k in open channels with bed-load / Roberto Gaudio 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. 239-247 Titre : Friction factor and von Kármán's k in open channels with bed-load Type de document : texte imprimé Auteurs : Roberto Gaudio, Auteur ; Antonio Miglio, Auteur ; Francesco Calomino, Auteur Année de publication : 2011 Article en page(s) : pp. 239-247 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Bed-load Friction factor Narrow flume Open channel Von Kàrmàn's k 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 : The assessment of the friction factor in open-channel flows with sediments is still an unsolved problem. For bed-load, various studies led to contrasting results, some finding that the friction factor is not affected by the sediment transport, whereas others observed an increase with the sediment concentration. Its effect was analysed in few studies only with gravel bed-load, and an empirical formula was proposed to predict the bed friction factor for pipe and open-channel flows, yet with a limited physical meaning and a general deviation of open-channel data. Also the von Kármán's κ has been recognized to vary with sediment transport. In the framework of classical dimensional analysis, laboratory investigations are here extended to sand bed-load and new empirical formulae based on both original and literature data are proposed for the assessment of the bed friction factor and von Kármán's κ, thereby accounting for the main parameters which affect resistance. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.561001 [article] Friction factor and von Kármán's k in open channels with bed-load [texte imprimé] / Roberto Gaudio, Auteur ; Antonio Miglio, Auteur ; Francesco Calomino, Auteur . - 2011 . - pp. 239-247. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 239-247 Mots-clés : Bed-load Friction factor Narrow flume Open channel Von Kàrmàn's k 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 : The assessment of the friction factor in open-channel flows with sediments is still an unsolved problem. For bed-load, various studies led to contrasting results, some finding that the friction factor is not affected by the sediment transport, whereas others observed an increase with the sediment concentration. Its effect was analysed in few studies only with gravel bed-load, and an empirical formula was proposed to predict the bed friction factor for pipe and open-channel flows, yet with a limited physical meaning and a general deviation of open-channel data. Also the von Kármán's κ has been recognized to vary with sediment transport. In the framework of classical dimensional analysis, laboratory investigations are here extended to sand bed-load and new empirical formulae based on both original and literature data are proposed for the assessment of the bed friction factor and von Kármán's κ, thereby accounting for the main parameters which affect resistance. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.561001

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