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Turbulent flow characteristics in circular corrugated culverts at mild slopes / Shawn P. Clark in Journal of hydraulic research, Vol. 49 N° 5 (Septembre/Octobre 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 676-684 Titre : Turbulent flow characteristics in circular corrugated culverts at mild slopes Type de document : texte imprimé Auteurs : Shawn P. Clark, Auteur ; Nicholas Kehler, Auteur Année de publication : 2011 Article en page(s) : pp. 676-684 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Culvert  Fish  passage  Secondary  current  Shear  stress  Turbulence  Velocity  distribution 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 : Anthropogenic barriers to fish passage at stream crossings are an important issue in North America. Environmental regulations impose velocity restrictions on culvert flow, which may be overly simplistic. A series of laboratory experiments were conducted in a corrugated metal pipe culvert at three mild slopes. Acoustic Doppler velocimeters were used to measure velocity and turbulence quantities. A significant percentage of the cross-sectional flow area was found to have a streamwise velocity lower than the mean bulk velocity. Secondary currents were measured and are believed to contribute to the strong velocity dip at the water surface and the non-uniform shape of the boundary shear stress distribution. A modified version of the log law is proposed to estimate water velocities within the fully-developed flow region. Results may be of interest to hydraulic engineers and regulators involved with fish passage issues at stream crossings as also for calibration and verification of numerical culvert models. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596399 [article] Turbulent flow characteristics in circular corrugated culverts at mild slopes [texte imprimé] / Shawn P. Clark, Auteur ; Nicholas Kehler, Auteur . - 2011 . - pp. 676-684. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 5 (Septembre/Octobre 2011) . - pp. 676-684 Mots-clés : Culvert  Fish  passage  Secondary  current  Shear  stress  Turbulence  Velocity  distribution 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 : Anthropogenic barriers to fish passage at stream crossings are an important issue in North America. Environmental regulations impose velocity restrictions on culvert flow, which may be overly simplistic. A series of laboratory experiments were conducted in a corrugated metal pipe culvert at three mild slopes. Acoustic Doppler velocimeters were used to measure velocity and turbulence quantities. A significant percentage of the cross-sectional flow area was found to have a streamwise velocity lower than the mean bulk velocity. Secondary currents were measured and are believed to contribute to the strong velocity dip at the water surface and the non-uniform shape of the boundary shear stress distribution. A modified version of the log law is proposed to estimate water velocities within the fully-developed flow region. Results may be of interest to hydraulic engineers and regulators involved with fish passage issues at stream crossings as also for calibration and verification of numerical culvert models. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.596399