Time-dependent local scour downstream of positive-step stilling basins / Giuseppe Oliveto in Journal of hydraulic research, Vol. 49 N° 1 (Janvier/Fevrier 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 105-112 Titre : Time-dependent local scour downstream of positive-step stilling basins Type de document : texte imprimé Auteurs : Giuseppe Oliveto, Auteur ; Victor Comuniello, Auteur ; Trupti Bulbule, Auteur Année de publication : 2011 Article en page(s) : pp. 105-112 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Densimetric Froude number Hydraulic jet Scour Stilling basins Time dependence 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 : Local scour downstream of spillways is an important problem in hydraulic engineering. The objective of this experimental study was to investigate the temporal evolution of local scour downstream of a spillway followed by a positive-step stilling basin. Experiments were conducted in a rectangular channel using four different sediments for the mobile bed. Additional tests concerned the incipient motion of sediment particles. The main parameters governing the scour process were found to be the tailwater densimetric Froude number and the relative tailwater depth. No experimental evidence was found on similar scour profiles. Scour starts at a much reduced tailwater densimetric Froude number when compared with Shields. The temporal variation of the scour hole geometry was estimated using simple power-law equations relating the scour geometry to the controlling scour parameters. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933312376~frm=titlelink [article] Time-dependent local scour downstream of positive-step stilling basins [texte imprimé] / Giuseppe Oliveto, Auteur ; Victor Comuniello, Auteur ; Trupti Bulbule, Auteur . - 2011 . - pp. 105-112. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 1 (Janvier/Fevrier 2011) . - pp. 105-112 Mots-clés : Densimetric Froude number Hydraulic jet Scour Stilling basins Time dependence 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 : Local scour downstream of spillways is an important problem in hydraulic engineering. The objective of this experimental study was to investigate the temporal evolution of local scour downstream of a spillway followed by a positive-step stilling basin. Experiments were conducted in a rectangular channel using four different sediments for the mobile bed. Additional tests concerned the incipient motion of sediment particles. The main parameters governing the scour process were found to be the tailwater densimetric Froude number and the relative tailwater depth. No experimental evidence was found on similar scour profiles. Scour starts at a much reduced tailwater densimetric Froude number when compared with Shields. The temporal variation of the scour hole geometry was estimated using simple power-law equations relating the scour geometry to the controlling scour parameters. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.informaworld.com/smpp/content~db=all~content=a933312376~frm=titlelink

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