Wave Scour around Group of Vertical Piles
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 124, Issue 5
Abstract
The paper presents the results of an experimental investigation on scour around pile groups with different configurations exposed to waves. Two kinds of tests were carried out: the actual scour experiments, and bed shear stress measurements. Seven kinds of pile-group arrangements were tested, including the side-by-side arrangements of piles, tandem arrangements of piles, and triangular and square group arrangements with two-, three-, and four-pile groups. The variations with the pile spacing as well as the Keulegan-Carpenter number, KC, were investigated. The scour depth can increase with respect to its single-pile value by as much as a factor of 3 for moderate KC numbers [such as O(10)] for most of the pile-group configurations for small pile spacings. For small KC numbers, this increase can be even higher, by as much as a factor of 10 or more. For a given pile spacing, the scour depth is mainly governed by the KC number. In agreement with the single-pile case, the larger the KC number, the larger the scour depth. The bed was live in all the tests except a few cases.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
Breusers, H. N. C., and Raudkivi, A. J. (1991). Scouring. A. A. Balkema, Rotterdam, The Netherlands.
2.
Chow, W. Y., and Herbich, J. B. (1978). “Scour around a group of piles.”Proc. Offshore Technol. Conf., Paper No. 3308, Dallas, Tex.
3.
Eadie, R. W. IV, and Herbich, J. B. (1986). “Scour about a single, cylindrical pile due to combined random waves and current.”Proc. 20th Coast. Engrg. Conf., Vol. 3, ASCE, 1858–1870.
4.
Fredsøe, J.(1984). “Turbulent boundary layers in wave-current motion.”J. Hydr. Engrg., ASCE, 110(8), 1103–1120.
5.
Herbich, J. B., Schiller, R. E. Jr., Watanabe, R. K., and Dunlap, W. A. (1984). “Seafloor scour.”Design guidelines for ocean-founded structures, Marcel Dekker, Inc., New York, N.Y.
6.
Kobayashi, T., and Oda, K. (1994). “Experimental study on developing process of local scour around a vertical cylinder.”Proc. 24th Int. Conf. on Coast. Engrg., Vol. 2, Chapter 93, ASCE, 1284–1297.
7.
Olsen, N. R. B., and Melaaen, M. C.(1993). “Three-dimensional calculation of scour around cylinders.”J. Hydr. Engrg., ASCE, 119(9), 1048–1054.
8.
Sumer, B. M., Arnskov, M. M., Christiansen, N., and Jørgensen, F. E.(1993a). “Two-component hot-film probe for measurements of wall shear stress.”Experiments in Fluids, 15, 380–384.
9.
Sumer, B. M., Christiansen, N., and Fredsøe, J.(1993b). “Influence of cross section on wave scour around piles.”J. Wtrwy., Port, Coast., and Oc. Engrg., ASCE, 119(5), 477–495.
10.
Sumer, B. M., Christiansen, N., and Fredsøe, J.(1997). “The horseshoe vortex and vortex shedding around a vertical wall-mounted cylinder exposed to waves.”J. Fluid Mech., Cambridge, U.K., 332, 41–70.
11.
Sumer, B. M., and Fredsøe, J. (1997). “Scour around a large vertical circular cylinder in waves.”OMAE 1997, Vol. I-A, American Society of Mechanical Engineers, New York, N.Y., 57–64.
12.
Sumer, B. M., Fredsøe, J., and Christiansen, N.(1992). “Scour around vertical pile in waves.”J. Wtrwy., Port, Coast., and Oc. Engrg., ASCE, 117(1), 15–31.
13.
Wang, R.-K., and Herbich, J. B. (1983). “Combined current and wave-produced scour around a single pile.”COE Rep. No. 269, Texas A&M University, College Station, Tex.
14.
Williamson, C. H. K.(1985). “Sinusoidal flow relative to circular cylinders.”J. Fluid Mech., Cambridge, U. K., 155, 141–174.
15.
Zdravkovich, M. (1985). “Forces on pipe clusters.”Proc., Int. Symp. on Separated Flow around Marine Struct., Norwegian Institute of Technology, Trondheim, Norway, 201–226.
Information & Authors
Information
Published In
Copyright
Copyright © 1998 American Society of Civil Engineers.
History
Published online: Sep 1, 1998
Published in print: Sep 1998
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.