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LIU Chun-jing, LI Dan-xun, QU Zhao-song, WANG Xing-kui. Velocity profile of open-channel flows in the transitional roughness region on mobile beds[J]. Advances in Water Science, 2006, 17(1): 49-54.
Citation: LIU Chun-jing, LI Dan-xun, QU Zhao-song, WANG Xing-kui. Velocity profile of open-channel flows in the transitional roughness region on mobile beds[J]. Advances in Water Science, 2006, 17(1): 49-54.

Velocity profile of open-channel flows in the transitional roughness region on mobile beds

Funds: The study is financially supported by the National Natural Science Foundation of China(No.50279013;50221903).
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  • Received Date: July 22, 2004
  • Revised Date: October 29, 2004
  • The experiments on open-channel flows on the rough mobile bed in the transitional region are reported in this paper. The velocity in the flume were measured by a 22D LDA,and the resistance coefficient were calculated with the Einstein's resistance division method. The experimental results show that(1)The Karman constant in the Log-law of the open channel flows in the transition region is smaller than which that of the smooth open channel flows,and the integral parameter B does not coincide well with the Nikuradse's result from the pipe flows;(2)The weak bed load in the flume may cause the drag-reducing effect;and(3)The Reynolds stress and the turbulence distribution are similar to those in the smooth open channel flows.
  • [1]
    Kirkgoz M S.Turbulent velocity profiles for smooth and rough open channel flow[J].J Hydraul Eng-ASCE,1989,115 (11):1543-1561.
    [2]
    Song T,Lemmin U,Graf W H.Uniform-flow in open channels with movable gravel-bed[J].J Hydraul Res,1994,32 (6):861-876.
    [3]
    Gust G,Southart J B.Effects of weak bed load on the universal law of wall[J].J of Geophysical Res,1983,88:5 939-5 952.
    [4]
    Nikora V,Goring D.Flow turbulence over fixed and weakly mobile gravel beds[J].J Hydraul Eng-ASCE,2000,126(9):676-690.
    [5]
    Gyr A,Schmid A.Turbulent flows over smooth erodible sand beds in flumes[J].J Hydraul Res,1997,35(4):525-544.
    [6]
    Wu S,Rajaratnam N.A simple method for measuring shear stress on rough boundaries[J].J Hydraul Res,2000,38(5):399-400.
    [7]
    Kironoto B A,Graf W H.Turbulence characteristics in rough uniform open-channel flow[J].Proc Instn Civ Engr Wat Marit & Energy,1994,106:333-444.
    [8]
    Bandyopadhyay P R.Rough-wall turbulent boundary layers in the transition regime[J].J Fluid Mech,1987,180:231-266.
    [9]
    Perry A E,Lim K L,Henbest S M.An experimental study of the turbulence structure in smooth-and rough-wall boundary layers[J].J Fluid Mech,1987,177:437-466.
    [10]
    Einstein H A.The bed-load function for sediment transportation in open channel flows[R] Tech Bull No 1026,U S Department of Agriculture,Washington,D C,1950.
    [11]
    Jimenez J.Turbulent flows over rough walls[J].Ann Rev Fluid Mech,2004,36:173-196.
    [12]
    Guo J.Discussion:A simple method for measuring shear stress on rough boundaries[J].J Hydrau Res,2001,39(4):445-446.

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