Abstract
This experimental study investigated the mean velocity profiles, skin friction and turbulent characteristics of a gravel bed over a wide range of roughness using an acoustic Doppler velocimeter (ADV). The median diameter of bed material ranged from 2 to 40 mm, and the normalized roughness heights ranged from 47 to 4,881 mm. The flow regime was fully developed turbulence with a Reynolds number in the range of 4.2 × 104–9.86 × 104. All velocity curves exhibited logarithmic distributions, and the log-law region was influenced greatly by both the roughness and the Reynolds number. Moreover, the roughness of the gravel bed exerted a strong effect on Reynolds stress, and the turbulence tended towards isotropic with increasing roughness. Using statistical analyses, the third-order turbulence moments, sweep, and ejection motions were also examined. The results of this experimental analysis present a contrast to the classical wall similarity hypothesis.
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Acknowledgments
The work described in this paper was supported partially by a Strategic Research Grant from the City University of Hong Kong, Hong Kong Special Administrative Region, HKSAR [Project No. 7002684(BC)], and the National Natural Science Foundation of China (Grant No. 40771022).
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Wang, X.Y., Yang, Q.Y., Lu, W.Z. et al. Experimental study of near-wall turbulent characteristics in an open-channel with gravel bed using an acoustic Doppler velocimeter. Exp Fluids 52, 85–94 (2012). https://doi.org/10.1007/s00348-011-1202-3
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DOI: https://doi.org/10.1007/s00348-011-1202-3