Analyzing Turbulence Intensity in Gravel Bed Channels
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VIEW THE REPLYPublication: Journal of Hydraulic Engineering
Volume 131, Issue 12
Abstract
In this paper, the results of an experimental investigation of the turbulence intensity in gravel bed channels are described. The runs were carried out by measuring, with an acoustic Doppler velocimeter, the turbulence intensity profile along six verticals of a given cross section in a laboratory flume. The analysis of the measured intensity distributions has shown the existence of two different regions, above and below the tops of the roughness elements, in which different intensity profiles occur. Furthermore, the measured profiles have shown a maximum of the turbulence intensity that decreases for increasing values of the roughness height, confirming that the turbulence damping efficiency increases when the roughness elements protrude inside the flow. The applicability of Nezu’s relationship (derived for a hydraulically smooth bed) for the experimental intensity profiles above the roughness elements is positively tested. Finally a new intensity distribution for a rough bed, applicable to the whole water depth, is proposed. In this profile, two coefficients having a known physical meaning (the maximum turbulence intensity and the depth at which this maximum is located) appear.
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References
Afzalimehr, H., and Anctil, F. (2000). “Accelerating shear velocity in gravel bed channel.” Hydrol. Sci. J., 45(1), 113–124.
Bathurst, J. C. (1988). “Velocity profile in high-gradient, boulder-bed channels.” Proc., Int. Conf. on Fluvial Hydraulics, Budapest, Hungary.
Bathurst, J. C., Li, R. M., and Simons, D. B. (1981). “Resistance equation for large-scale roughness.” J. Hydraul. Div., Am. Soc. Civ. Eng., 107(12), 1593–1613.
Bayazit, M. (1976). “Free surface flow in a channel of large relative roughness.” J. Hydraul. Res., 14, 115–126.
Blinco, P. H., and Partheniades, E. (1971). “Turbulence characteristics in free surface flows over smooth and rough boundaries.” J. Hydraul. Res., 9, 43–69.
Bray, D. I. (1987). “A review of flow resistance in gravel bed rivers.” Proc. workshop “Leggi morfologiche e loro verifica di campo”, Cosenza, Italy.
Carollo, F. G., Ferro, V., and Termini, D. (2002). “Flow velocity measurement in vegetated channels.” J. Hydraul. Eng., 128(7), 664–673.
Clark, J. A. (1968). “A study of incompressible turbulent boundary layers in channel flows.” J. Basic Eng., 90, 455–468.
De Bruin, H. A. R., and Moore, C. J. (1985). “Zero-plane displacement and roughness length for tall vegetation, derived from a simple mass conservation hypothesis.” Boundary-Layer Meteorol., 31, 39–49.
Dittrich, A., and Koll, K. (1997). “Velocity field and resistance of flow over rough surfaces with large and small relative submergence.” Int. J. Sediment Research, 12(3), 21–33.
Eckelmann, H. (1974). “The structure of viscous sublayer and the adjacent wall region in a turbulent channel.” J. Fluid Mech., 65, 439–459.
Einstein, H. A., and El-Samni, E. A. (1949). “Hydrodynamic forces on a rough wall.“ Rev. Mod. Phys., 21, 520–524.
Ferro, V. (2003). “ADV measurements of velocity distributions in a gravel-bed flume.” Earth Surf. Processes Landforms, 28, 707–722.
Ferro, V., and Baiamonte, G. (1994). “Flow velocity profiles in gravel-bed rivers.” J. Hydraul. Eng., 120(1), 60–80.
Ferro, V., and Giordano, G. (1990). “Esperienze sulle resistenze al moto in alvei di tipo montano: riesame critico e nuove acquisizioni.” Riv. Ingegneria Agraria, 21(2), 83–98 (in Italian).
Ferro, V., and Giordano, G. (1992). “Valutazione sperimentale delle resistenze al moto in alvei con vegetazione rigida sul fondo in condizioni di macroscabrezza.” Quaderni Idronomia Montana, 11/12, 163–181 (in Italian).
Ferro, V., and Giordano, G. (1993). “Velocity profile and flow resistance in gravel bed rivers.” Excerpta, 7, 99–104.
Grass, A. J. (1971). “Structural features of turbulent flow over smooth and rough boundaries.” J. Fluid Mech., 50, 233–255.
Grishanin, K. V. (1990). Fundamentals of the dynamics of alluvial flows, Transport, Mosca, Russia.
Ikeda, S., and Kanazawa, M. (1996). “Three-dimensional organized vortices above flexible water plants.” J. Hydraul. Eng., 122(11), 634–640.
Kellerhals, R., and Bray, D. I. (1971). “Sampling procedures for coarse fluvial sediments.” J. Hydraul. Div., Am. Soc. Civ. Eng., 97(8), 1165–1180.
Kironoto, B. A., and Graf, W. H. (1994). “Turbulence characteristics in rough uniform open-channel flow.” Proc. Inst. Civ. Eng., Waters. Maritime Energ., 106, 333–344.
Klaven, A. B. (1966). “Investigation of the flow turbulent structure.” Trans. State Hydrol. Inst. 136, Gidrometeoizdat Leningrado, Russia, 65–76.
Klaven, A. B. (1968). “Kinematic structure of the turbulent flow.” Trans. State Hydrol. Inst. 147, Gidrometeoizdat, Leningrado, Russia, 134–141.
Kraus, N. C., Lohrmann, A., and Cabrera, R. (1994). “New acoustic meter for measuring 3D laboratory flows.” J. Hydraul. Eng., 120(3), 406–412.
Laufer, J. (1954). “The structure of turbulence in fully developed pipe flow.” Tech. Report No. 1174, National Advisory Committee for Aeronautics NACA.
Marchand, J. P., Jarret, R. D., and Jones, L. L. (1984). “Velocity profile, water-surface slope, and bed-material size for selected streams in Colorado.” Open File Rep. No. 84-773, U.S. Geological Survey.
Nakagawa, H., Nezu, I., and Ueda, H. (1975). “Turbulence of open channel flow over smooth and rough beds.” Proc., JSCE, 241, 155–168.
Nezu, I. (1977). “Turbulence intensities in open-channel flows.” Proc., JSCE, 261, 67–76.
Nezu, I., and Nakagawa, H. (1993). Turbulence in open channel flows, A. A. Balkema, Rotterdam, The Netherlands.
Nezu, I., and Rodi, W. (1986). “Open-channel flow measurements with a laser Doppler Anemometer.” J. Hydraul. Eng., 112(5), 335–355.
NORTEK AS. (1996). ADV operation material, Vollen, Norway.
Shen, H. W. (1973). “Flow resistance over short simulated vegetation and various tall simulated vegetation groupings on flow resistance and sediment yield.” Environmental impact on rivers (Rivers Mechanics III), Chap. 3, H. W. Shen, ed.
Shvidchenko, A. B., and Pender, G. (2001). “Macroturbulent structure of open-channel flow over gravel beds.” Water Resour. Res., 37(3),709–719.
Smart, G. M. (1999). “Turbulent velocity profiles and boundary shear in gravel bed rivers.” J. Hydraul. Eng., 125(2), 106–116.
Steffler, P. M., Rajaratnam, N., and Peterson, A. W. (1983). “LDA measurements of mean velocity and turbulence distribution in a smooth rectangulary open channel.” Water Resources Engineering, Rep. No. 83-4, Dept. of Civil Engineering, Univ. of Alberta, Alberta, Canada.
van Rijn, L. C. (1982). “Equivalent roughness of alluvial bed.” J. Hydraul. Div., Am. Soc. Civ. Eng., 108(10), 1215–1218.
Wahl, T. L. (2000). “Analyzing ADV data using WinADV.” Proc., ASCE Joint Conf. on Water Resources Engineering and Water Resources Planning & Management, Minneapolis, Minn.
Wang, J., Dong, Z., Chen, C., and Xia, Z. (1993). “The effects of bed roughness on the distribution of turbulent intensities in open channel flow.” J. Hydraul. Res., 31(1), 89–98.
Webel, G., and Schatzmann, M. (1984). “Transverse mixing in open channel flow.” J. Hydraul. Eng., 110(4), 423–435.
Yalin, M. S. (1992). River mechanics, Pergamon, Terrytown, N.Y.
Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 131 • Issue 12 • December 2005
Pages: 1050 - 1061
Copyright
© 2005 ASCE.
History
Received: Mar 12, 2003
Accepted: Feb 28, 2005
Published online: Dec 1, 2005
Published in print: Dec 2005
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