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Distribution of turbulent intensity in a gravel-bed flume

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Abstract

Detailed measurements have been taken for the longitudinal turbulent intensities of flow in a gravel-bed flume. The experimental results indicate that the distribution of turbulent intensity greatly depends on the relative roughness. In comparison with the smooth-bed results, the roughness makes the flow turbulence become well-distributed, especially in the region near the bed and in the case of smaller H/K s values. In addition, the cross sectional average of turbulent intensity is also discussed in this paper, and the results show that the roughness makes flow turbulence much more intense.

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Abbreviations

D u :

empirical constant

H :

flow depth

K s :

roughness height

N :

\(N = \frac{1}{H}\int\limits_0^H {\frac{{u\prime }}{{\bar U}}} {\text{ }}dy\), the mean turbulence intensity over the cross section

Re * :

\(Re* = \frac{{k_s u_* }}{\nu }\), roughness Reynolds number

u′ :

the RMS of streamwise fluctuating velocity

u * :

friction velocity

Ū :

mean bulk velocity

x :

coordinate alined with mainstream velocity (x = 0 is channel entrance)

y :

vertical coordinate to the rough bed (y = 0 is the top of the rough elements)

y + \(\frac{{yu_* }}{\nu }\) :

λ u empirical constant

v :

kinematic viscosity

References

  • Blinco, P. H.; Partheniades, E. 1971: Turbulence characteristics in free surface flows over smooth and rough boundaries. JHR. 9, 43–69

    Google Scholar 

  • Dong, D. N.; Dong, Y. 1990: Turbulence characteristics in smooth open-channel flow. Science in China (Series A). 33, 244–256

    Google Scholar 

  • Ligrani, P. M.; Moffat, R. J. 1986: Structure of transitionally rough and fully rough turbulent boundary layers. J. Fluid Mech. 162, 69–98

    Google Scholar 

  • McQuivey, R. S.; Richardson, E. V. 1969: Some turbulence measurements in open-channel flow. J. Hydr. Div. ASCE. Hy1, 209–223

  • Nakagawa, H.; Tsujimoto, T.; Shimizu, Y. 1988: Velocity profile of flow over rough permeable bed. Proc. 6th Congress of Asian and pacific Regional Division, IAHR. 449-456

  • Nezu, I. 1977: Turbulent structure in open-channel flows. Ph.D. Thesis presented to Kyoto University, Kyoto, Japan

  • Nezu, I.; Rodi, W. 1986: Open-channel flow measurements with a laser doppler anemometer. J. Hydr. Eng., ASCE. 112, 335–355

    Google Scholar 

  • Richardson, E. V.; McQuivey, R. S. 1968: Measurement of turbulence in water flow. J. Hydr. Div., ASCE. 94, 411–429

    Google Scholar 

  • Wang, J. J. 1990: Turbulence characteristics in rough open-channel flow. Ph.D. Thesis presented to Tsinghua University, Beijing, China

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Authors and Affiliations

  1. Inst. of Fluid Mechanics, Beijing University of Aeronautics and Astronautics, 100083, Beijing, China

    J.-J. Wang

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  1. J.-J. Wang
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Wang, JJ. Distribution of turbulent intensity in a gravel-bed flume. Experiments in Fluids 11, 201–202 (1991). https://doi.org/10.1007/BF00190303

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  • DOI: https://doi.org/10.1007/BF00190303

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