Surface Wave Forces Acting on Submerged Logs
Publication: Journal of Hydraulic Engineering
Volume 128, Issue 3
Abstract
Drag forces exerted on cylindrical simulated logs by flowing water are measured in a laboratory flume. Drag coefficient values calculated from these data are presented for a range of log submergence and slenderness values. Drag coefficients for large submergence values are consistent with those previously published. However, at submergence values less than eight element diameters, the observed drag coefficients are consistently higher than those previously published. This discrepancy is due to the additional drag created by stationary surface waves which causes the drag coefficient to increase considerably when a log is positioned near the free surface. This phenomenon, which has not been accounted for in previous studies on large woody debris, is shown to depend on log slenderness, submergence, and Froude number.
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References
Abbe, T. B., and Montgomery, D. R.(1996). “Large woody debris jams, channel hydraulics, and habitat formation in large rivers.” Regul. Rivers Res. Management, 12, 201–221.
Braudrick, C. A., and Grant, G. E.(2000). “When do logs move in rivers?” Water Resour. Res., 36(2), 571–583.
Daily, J. W., and Harleman, D. R. F. (1966). Fluid Dynamics, Addison-Wesley, New York.
Fage, A., and Warsap, J. H. (1930). “The effects of turbulence and surface roughness on the drag of circular cylinders.” Aeronautical Research Council, Rep. and Memoranda No. 1283, London, 15 pp.
Flammer, G. H., Tullis, J. P., and Mason, E. S.(1970). “Free surface, velocity gradient flow past hemisphere.” J. Hydraul. Div. Am. Soc. Civ. Eng., 96(HY7), 1485–1502.
Gertler, M. (1954). “A reanalysis of the original test data for the Taylor Standard Series.” The David W. Taylor Model Basin Rep. No. 806, Washington, D.C., 45 pp.
Prandtl, L., and Tietjens, O. (1934). Applied Hydro- & Aeromechanics, J. P. den Hartog, translator, Dover, New York, Vol. II.
Rouse, H. (1961). Fluid Mechanics for Hydraulic Engineers, Engineering Societies Monograph, Dover, New York).
Shields, F. D., Jr., and Gippel, C. J.(1995). “Prediction of effects of woody debris removal on flow resistance.” J. Hydraul. Eng., 121(4), 341–354.
Wallerstein, N. P., Alonso, C. V., Bennett, S. J., and Thorne, C. R.(2001). “Distorted Froude-scaled flume analysis of large woody debris.” Earth Surf. Processes Landforms, 26, 1265–1283.
Weinblum, G., Amstberg, H., and Bock, W. (1950) “Tests on wave resistance of immersed bodies of revolution.” The David W. Taylor Model Basin Transl. no. 234, Washington D.C.
White F. M. (1979). Fluid Mechanics, McGraw-Hill, New York.
Wigley, W. C. S.(1953). “Water forces on submerged bodies in motion.” Trans. Inst. Naval Arch., 95, 268–279.
Wood, A. L. (2001). “A geomorphological analysis of bank processes: The fate of failed blocks stored in the basal zone of incised channels.” Doctoral dissertation, School of Geography, University of Nottingham, England, 300 pp. and Appendixes.
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Information
Published In
Journal of Hydraulic Engineering
Volume 128 • Issue 3 • March 2002
Pages: 349 - 353
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: Apr 4, 2000
Accepted: Sep 18, 2001
Published online: Mar 1, 2002
Published in print: Mar 2002
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