Permeability effects of single groin on flow characteristics / Joongu Kang in Journal of hydraulic research, Vol. 49 N° 6 (Novembre/Décembre 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 728-735 Titre : Permeability effects of single groin on flow characteristics Type de document : texte imprimé Auteurs : Joongu Kang, Auteur ; Hongkoo Yeo, Auteur ; Sungjung Kim, Auteur Année de publication : 2012 Article en page(s) : pp. 728-735 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Flow separation Impermeable groin Permeable Pile Recirculation zone Triangular-shaped 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 results of an experimental study on the flow characteristics around a groin structure of various geometries and permeabilities are presented. The impermeable rectangular, the permeable pile, and the triangular-shaped groins are considered. The velocity fields were observed using large-scale particle image velocimetry, whereas the maximum velocities were measured using an acoustic Doppler velocimeter. An increased velocity at the groin tip and a broad range of the recirculation zones were observed for the impermeable rectangular groin. For the permeable pile groin, the velocity at the groin tip, the vortex strength, and the scale of the recirculation zone tended to decrease as the openings between the piles increased. Also, the triangular-shaped groin formed narrower and longer recirculation zones compared with the permeable pile groin of identical cross-sectional flow area. These quantitative findings on the flow patterns for groins of various geometries and permeabilities are practically important to design and evaluate their performance in field applications. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.614520 [article] Permeability effects of single groin on flow characteristics [texte imprimé] / Joongu Kang, Auteur ; Hongkoo Yeo, Auteur ; Sungjung Kim, Auteur . - 2012 . - pp. 728-735. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 728-735 Mots-clés : Flow separation Impermeable groin Permeable Pile Recirculation zone Triangular-shaped 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 results of an experimental study on the flow characteristics around a groin structure of various geometries and permeabilities are presented. The impermeable rectangular, the permeable pile, and the triangular-shaped groins are considered. The velocity fields were observed using large-scale particle image velocimetry, whereas the maximum velocities were measured using an acoustic Doppler velocimeter. An increased velocity at the groin tip and a broad range of the recirculation zones were observed for the impermeable rectangular groin. For the permeable pile groin, the velocity at the groin tip, the vortex strength, and the scale of the recirculation zone tended to decrease as the openings between the piles increased. Also, the triangular-shaped groin formed narrower and longer recirculation zones compared with the permeable pile groin of identical cross-sectional flow area. These quantitative findings on the flow patterns for groins of various geometries and permeabilities are practically important to design and evaluate their performance in field applications. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.614520

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