Drag coefficients of boulders on a block ramp due to interaction processes / Mario Oertel in Journal of hydraulic research, Vol. 49 N° 3 (Mai/Juin 2011)  

Public ISBD [article]  inJournal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 372-377 Titre : Drag coefficients of boulders on a block ramp due to interaction processes Type de document : texte imprimé Auteurs : Mario Oertel, Auteur ; Svenja Peterseim, Auteur ; Andreas Schlenkhoff, Auteur Année de publication : 2011 Article en page(s) : pp. 372-377 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Block ramp Boulder Drag coefficient force Energy dissipation Rough 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 : Block ramps are a common natural solution for bypassing large steps in riverbeds. The energy dissipation on these ramps was dealt with to develop formulas describing the hydraulic processes. Currently there are no detailed investigations available analysing the resulting forces for boulders on the ramp, although knowledge of these forces is necessary to guarantee an accurate and appropriate design. An investigation programme using a physical model was therefore conducted to describe the effect of boulder interaction processes with respect to forces and drag coefficients. The variable drag coefficients received a special focus because these influence the determination of mean water levels, mean velocities and forces on a single boulder. The physical model allows variation of both discharges and boulder arrangements. As a measurement technique, ultrasonic sensors and load cells were used to determine water levels and drag forces directly. New formulas for Reynolds number-dependent drag coefficients are developed. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.565695 [article] Drag coefficients of boulders on a block ramp due to interaction processes [texte imprimé] / Mario Oertel, Auteur ; Svenja Peterseim, Auteur ; Andreas Schlenkhoff, Auteur . - 2011 . - pp. 372-377. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 3 (Mai/Juin 2011) . - pp. 372-377 Mots-clés : Block ramp Boulder Drag coefficient force Energy dissipation Rough 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 : Block ramps are a common natural solution for bypassing large steps in riverbeds. The energy dissipation on these ramps was dealt with to develop formulas describing the hydraulic processes. Currently there are no detailed investigations available analysing the resulting forces for boulders on the ramp, although knowledge of these forces is necessary to guarantee an accurate and appropriate design. An investigation programme using a physical model was therefore conducted to describe the effect of boulder interaction processes with respect to forces and drag coefficients. The variable drag coefficients received a special focus because these influence the determination of mean water levels, mean velocities and forces on a single boulder. The physical model allows variation of both discharges and boulder arrangements. As a measurement technique, ultrasonic sensors and load cells were used to determine water levels and drag forces directly. New formulas for Reynolds number-dependent drag coefficients are developed. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.565695

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