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Research Papers: Ocean Engineering

Scour Around Vertical Pile Foundations for Offshore Wind Turbines Due to Long-Crested and Short-Crested Nonlinear Random Waves

[+] Author and Article Information
Dag Myrhaug

e-mail: dag.myrhaug@ntnu.no

Muk Chen Ong

Department of Marine Technology,
Norwegian University of Science and Technology,
NO-7491 Trondheim, Norway

Contributed by the Ocean Offshore and Arctic Engineering Division of ASME for publication in the JOURNALOF OFFSHORE MECHANICSAND ARCTIC ENGINEERING. Manuscript received March 4, 2011; final manuscript received April 2, 2012; published online February 22, 2013. Assoc. Editor: Lance Manuel.

J. Offshore Mech. Arct. Eng 135(1), 011103 (Feb 22, 2013) (6 pages) Paper No: OMAE-11-1025; doi: 10.1115/1.4007048 History: Received March 04, 2011; Revised April 02, 2012

This paper provides a practical stochastic method by which the maximum equilibrium scour depth around vertical piles exposed to long-crested (2D) and short-crested (3D) nonlinear random waves can be derived. The approach is based on assuming the waves to be a stationary narrow-band random process, adopting the Forristall wave crest height distribution (Forristall, 2000, “Wave Crest Distributions: Observations and Second-Order Theory,” J. Phys. Oceanogr., 30, pp. 1931–1943) representing both 2D and 3D nonlinear random waves, and using the regular wave formulas for scour depth by Sumer et al. (1992, “Scour Around Vertical Pile in Waves,” J. Waterway, Port, Coastal, Ocean Eng., 114(5), pp. 599–641). An example calculation is provided. Tentative approaches to related random wave-induced scour cases are also suggested.

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Figures

Grahic Jump Location
Fig. 1

Definition sketch of the scour depth (S) around vertical pile with diameter (D)

Grahic Jump Location
Fig. 2

Definition sketch of pile arrangements for G/D = 0.4 and scour-depth (S) around vertical pile (reproduced from Sumer and Fredsøe [31])

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