Scour Around Vertical Pile in Waves
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 118, Issue 1
Abstract
This paper presents the results of an experimental investigation on scour around piles exposed to waves. In addition to the actual scour tests, bed shear‐stress measurements and a flow visualization study are carried out. The effects of lee wake and horseshoe vortex are demonstrated to be the two key elements in the scour process. The development of these flow structures mainly depends on the Keulegan‐Carpenter (KC) number that hereby becomes the main parameter that governs the equilibrium scour depth on a live bed. Based on the present data, a design equation is established, relating the scour depth to the Keulegan‐Carpenter number. For the values of the Keulegan‐Carpenter number below six, the scour around the pile practically ceases to exist. The scour depth normalized by the pile diameter is found to increase with increasing Keulegan‐Carpenter number and approaches its steady‐current value for Keulegan‐Carpenter numbers above approximately 100.
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References
1.
Breusers, H. N. C., Nicollet, G., and Shen, H. W. (1977). “Local scour around cylindrical piers.” J. Hydr. Res., 15(3), 211–252.
2.
Das, M. M. (1970). “A literature review on bed‐load transport due to wave action and localized scour in non‐cohesive sediments.” Final Report HEL 21‐6: A Literature Review on Erosion and Deposition of Sediment near Structures in the Ocean, H. A. Einstein and R. L. Wiegel, eds., Hydraulic Engrg. Lab., Coll. of Engrg., Univ. of California, Berkeley, Calif.
3.
Eadie, IV, R. W., and Herbich, J. B. (1986). “Scour about a single, cylindrical pile due to combined random waves and a current.” Proc. 20th Coastal Engineering Conference, ASCE Nov. 9‐14, 1858–1870.
4.
Herbich, J. B., Schiller, Jr., R. E., Dunlap, W. A., and Watanabe, R. K. (1984). Seafloor Scour. Marcel Dekker, Inc., New York, N.Y.
5.
Hjorth, P. (1975). “Studies on the nature of local scour.” Bulletin Series A, No. 46, Dept. of Water Resour. Engrg., Lund Inst. of Tech., Univ. of Lund, Sweden.
6.
Jensen, B. L., Sumer, B. M., and Fredsøe, J. (1989). “Turbulent oscillatory boundary layers at high Reynolds numbers.” J. Fluid Mech., 206(Sept.), 265–297.
7.
Kawata, Y., and Tsuchiya, Y. (1988). “Local scour around cylindrical piles due to waves and currents combined.” Proc. 21st Coastal Engrg. Conf., ASCE, 2(June 20–25), 1310–1322.
8.
Palmer, H. D. (1969). “Wave‐induced scour on the sea floor.” Proc. of the Civ. Engrg. in the Oceans II, ASCE (Dec.), 703–716.
9.
Schewe, G. (1983). “On the force fluctuations acting on a circular cylinder in crossflow from subcritical up to transcritical Reynolds numbers.” J. Fluid Mech., 133(Aug.), 265–285.
10.
Schlichting, H. (1979). Boundary‐layer theory. 7th Ed., McGraw‐Hill Book Company.
11.
Sumer, B. M., and Fredsøe, J. (1989). “Effect of Reynolds number on vibration of cylinders.” J. Offshore Mech. and Arctic Engrg., 111(May), 131–137.
12.
Sumer, B. M., and Fredsøe, J. (1990). “Scour below pipelines in waves.” J. Waterways, Port, Coastal, and Ocean Engrg., ASCE, 116(3), 307–323.
13.
Wang, R.‐K., and Herbich, J. B. (1983). “Combined current and wave‐produced scour around a single pile.” COE Report No. 269, Texas Engrg. Experiment Station, Dept. Civ. Engrg., The Texas A&M Univ., College Station, Tex.
14.
Williamson, C. H. K. (1985). “Sinusoidal flow relative to circular cylinders.” J. Fluid Mech., 155(June), 141.
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Copyright © 1992 ASCE.
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Published online: Jan 1, 1992
Published in print: Jan 1992
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