Bedform Length and Velocity Pulsations in Alluvial Channels
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 114, Issue 3
Abstract
It is conjectured that the low‐frequency turbulence in alluvial channels is engendered at the separation points of the large eddies in the lee of bedforms. These points are taken as the locations of point sources of pressure disturbances, and their influence throughout the flow region is determined using the normal‐mode analysis of the linear hydrodynamic stability theory for inviscid fluids. The analysis predicts that the spatial rate of decay, with respect to depth, of the standard deviation of velocity fluctuations is closely related to the bedform length. The theoretical predictions are borne out reasonably well by the observed data.
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References
1.
Bennett, J. P., and McQuivey, R. S. (1970). “Comparison of a propeller flowmeter with a hot‐film anemomenter in measuring turbulence in movable boundary open‐channel flows.” U.S. Geological Survey Professional Paper 700‐B, B254–262.
2.
Betchov, R., and Criminale, W. O., Jr. (1967). Stability of parallel flows. Academic Press, New York, N.Y.
3.
Chandrasekhar, S. (1981). Hydrodynamic and hydromagnetic stability. Dover Publications, Inc., New York, N.Y.
4.
Drazin, P. G., and Reid, W. H. (1982). Hydrodynamic stability. Cambridge University Press, Cambridge, England.
5.
Elata, C., and Ippen, A. T. (1961). “The dynamics of open channel flow with suspensions of neutrally buoyant particles.” Tech. Report No. 45, Hydrodynamics Lab., M.I.T., Cambridge, Mass.
6.
Haque, M. I., and Mahmood, K. (1985). “Geometry of ripples and dunes.” J. Hydr. Engrg., ASCE, 111(1), 48–63.
7.
Keefer, T. N. (1971). “The relation of turbulence to diffusion in open channel flows.” U.S. Geological Survey, Open‐File Report, Fort Collins, Colo.
8.
Lin, C. C. (1955). The theoiy of hydrodynamic stability. Cambridge University Press, Cambridge, England.
9.
Mahmood, K., and Tarar, R. N. (1976). “Field research in large sand bed channels.” Rivers '76, Symp. Inland Wtrways. for Navigation, Flood Control and Water Diversion, ASCE, 1318–1328.
10.
Mahmood, K., et al. (1984). “Bedform data in ACOP canals—Equilibrium runs 1979–1980.” Tech. Report, George Washington Univ., Washington, D.C.
11.
Mahmood, K., Haque, M. I., and Mehrdad, M. H. (1985). “Velocity profile in sandbed canals.” 3rd U.S.‐Pakistan Binatl. Symp. Mech. Alluvial Channels, Lahore, Pakistan.
12.
McQuivey, R. S. (1972). “Principles and measuring techniques of turbulence characteristics in open‐channel flows.” U.S. Geological Survey, Open‐File Report, St. Louis, Mo.
13.
Raichlen, F. (1967). “Some turbulence measurements in water.” J. Engrg. Mech. Div., ASCE, 93(2), 73–97.
14.
Richardson, E. V., and McQuivey, R. S. (1968). “Measurement of turbulence in water.” J. Hydr. Div., ASCE, 94(2), 441–430.
15.
Schlichting, H. (1968). Boundary‐layer theory, 6th Ed., McGraw‐Hill Book Co., New York, N.Y.
16.
Shivamoggi, B. K. (1986). Stability of parallel gas flows. Ellis Horwood Ltd., West Sussex, England.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 114 • Issue 3 • May 1988
Pages: 315 - 330
Copyright
Copyright © 1988 ASCE.
History
Published online: May 1, 1988
Published in print: May 1988
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