Documents disponibles écrits par cet auteur

Event flow hydrograph-based method for shear velocity estimation / Bhuban Ghimire in Journal of hydraulic research, Vol. 49 N° 2 (Mars/Avril 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 272-275 Titre : Event flow hydrograph-based method for shear velocity estimation Type de document : texte imprimé Auteurs : Bhuban Ghimire, Auteur ; Deng, Zhi-Qiang, Auteur Année de publication : 2011 Article en page(s) : pp. 272-275 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Friction  slope  Hydrograph  Shear  velocity  Unsteady  flow  Wave 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 : Due to the lack of a simple method for finding the shear velocity during flood events, most sediment resuspension or transport models either resort to complex numerical models requiring detailed input data or rely on uniform steady flow formula. Here a practical method for estimating the shear velocity of unsteady flow is presented by using the flow hydrograph and channel geometry data. Using equations for open channel flow, formulas for shear velocity are derived in terms of discharge gradient, representing the friction slope of unsteady flow in prismatic channels. Applications of the new method using published experimental data and simulated results indicate that the method is comparable with existing methods in terms of accuracy but requires less input data. This method is particularly applicable to natural floods in relatively straight reaches of lowland rivers where the non-inertia wave approximation to the Saint-Venant equations is theoretically appropriate. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.552463 [article] Event flow hydrograph-based method for shear velocity estimation [texte imprimé] / Bhuban Ghimire, Auteur ; Deng, Zhi-Qiang, Auteur . - 2011 . - pp. 272-275. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 2 (Mars/Avril 2011) . - pp. 272-275 Mots-clés : Friction  slope  Hydrograph  Shear  velocity  Unsteady  flow  Wave 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 : Due to the lack of a simple method for finding the shear velocity during flood events, most sediment resuspension or transport models either resort to complex numerical models requiring detailed input data or rely on uniform steady flow formula. Here a practical method for estimating the shear velocity of unsteady flow is presented by using the flow hydrograph and channel geometry data. Using equations for open channel flow, formulas for shear velocity are derived in terms of discharge gradient, representing the friction slope of unsteady flow in prismatic channels. Applications of the new method using published experimental data and simulated results indicate that the method is comparable with existing methods in terms of accuracy but requires less input data. This method is particularly applicable to natural floods in relatively straight reaches of lowland rivers where the non-inertia wave approximation to the Saint-Venant equations is theoretically appropriate. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.552463