Streambank shear stress estimates using turbulent kinetic energy / Leslie Hopkinson in Journal of hydraulic research, Vol. 50 N° 3 (Mai/Juin 2012)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 320-323 Titre : Streambank shear stress estimates using turbulent kinetic energy Type de document : texte imprimé Auteurs : Leslie Hopkinson, Auteur ; Theresa Wynn-Thompson, Auteur Année de publication : 2012 Article en page(s) : pp. 320-323 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Boundary shear stress Reynolds Turbulent flow kinetic energy Vegetation Résumé : In tidal environments, the boundary shear stress (BSS) is directly proportional to the turbulent kinetic energy, with a reported proportionality coefficient of 0.19. This coefficient was calculated using velocity time series to determine Reynolds stresses and, ultimately, to estimate the BSS. The coefficient has not been evaluated using direct measurements of BSS or for environments other than tidal systems. This laboratory flume study examines the validity of this relationship for a sloping streambank with and without vegetation. BSSs and near-bank Reynolds stresses were calculated using a constant temperature anemometer and velocity measurements, respectively. The coefficient ranged from 0.11 to 0.53 when calculated with the measured values of BSS, and 0.09 to 0.37 when calculated with Reynolds stresses. The variation was attributed to differences in turbulence generation, coefficient development, and instrumentation. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684771 [article] Streambank shear stress estimates using turbulent kinetic energy [texte imprimé] / Leslie Hopkinson, Auteur ; Theresa Wynn-Thompson, Auteur . - 2012 . - pp. 320-323. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 50 N° 3 (Mai/Juin 2012) . - pp. 320-323 Mots-clés : Boundary shear stress Reynolds Turbulent flow kinetic energy Vegetation Résumé : In tidal environments, the boundary shear stress (BSS) is directly proportional to the turbulent kinetic energy, with a reported proportionality coefficient of 0.19. This coefficient was calculated using velocity time series to determine Reynolds stresses and, ultimately, to estimate the BSS. The coefficient has not been evaluated using direct measurements of BSS or for environments other than tidal systems. This laboratory flume study examines the validity of this relationship for a sloping streambank with and without vegetation. BSSs and near-bank Reynolds stresses were calculated using a constant temperature anemometer and velocity measurements, respectively. The coefficient ranged from 0.11 to 0.53 when calculated with the measured values of BSS, and 0.09 to 0.37 when calculated with Reynolds stresses. The variation was attributed to differences in turbulence generation, coefficient development, and instrumentation. ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/full/10.1080/00221686.2012.684771

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