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Friction velocity associated to a non-uniform flow and an intermediate scale roughness

Author(s): Hossein Afzalimehr; François Anctil

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Abstract: This work consists of an experimental study of the resistance associated with non-uniform flows over cobble-bed channels, leading to an intermediate scale roughness. Friction velocity is estimated for twelve cases of accelerating and decelerating flows. Four estimation methods are compared: Reynolds stress, logarithmic law, parabolic law and a global approach. They are all in close agreement. The observed mean longitudinal velocity profiles are consistent with observations reported in the literature for non-uniform flows over gravel-bed channels with small relative roughness. Accelerating flows produce smaller friction velocities than decelerating flows, which is contrary to observations reported in the literature.


Year: 2001

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