Accelerating shear velocity in gravel-bed channels |
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| Authors: | HOSSEIN AFZALIMEHR FRANÇOIS ANCTIL |
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| Institution: | Department of Civil Engineering , Université Laval , Ste-Foy, Quebec, G1K 7P4, Canada E-mail: francois.anctil@gci.ulaval.ca |
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| Abstract: | Abstract The behaviour of the shear velocity along a gravel-bed channel is investigated experimentally in the presence of a negative pressure gradient (accelerating flow). Different methods of estimation of the shear velocity, derived from vertical profiles of the mean longitudinal point velocity, are examined and a new method is proposed. Results show that the proposed method of estimation is comparable to the St Venant and Clauser's methods. At a specific cross section, for constant bottom slope and relative roughness, shear velocity increases with discharge. |
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| Keywords: | dam failure mathematical modelling physical models finite difference scheme unsteady flow erosion and sediment transport |
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