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Technical Briefs

Effects of Sand-Clay Mixtures on Scour Around Vertical Piles Due to Long-Crested and Short-Crested Nonlinear Random Waves

[+] Author and Article Information
Dag Myrhaug

Department of Marine Technology,
Norwegian University of Science and Technology,
NO-7491 Trondheim, Norway
e-mail: dag.myrhaug@ntnu.no

Muk Chen Ong

Norwegian Marine Technology
Research Institute (MARINTEK),
NO-7450 Trondheim, Norway
e-mail: muk.chen.ong@marintek.sintef.no

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 24, 2012; final manuscript received January 29, 2013; published online May 27, 2013. Assoc. Editor: Dong S. Jeng.

J. Offshore Mech. Arct. Eng 135(3), 034502 (May 27, 2013) (4 pages) Paper No: OMAE-12-1093; doi: 10.1115/1.4023801 History: Received September 24, 2012; Revised January 29, 2013

This note provides a practical stochastic method by which the effects of sand-clay mixtures on the maximum equilibrium scour depth around vertical piles exposed to long-crested (2D) and short-crested (3D) nonlinear random waves can be derived. This is made by using the regular wave formulas for scour depth for sand-clay mixtures by Dey et al. (2011, Scour at Vertical Piles in Sand-Clay Mixtures Under Waves,” J. Waterway, Port, Coastal, Ocean Eng., 137(6), pp. 324–331) and the stochastic method presented by Myrhaug and Ong (2013, “Scour Around Vertical Pile Foundations for Offshore Wind Turbines Due to Long-Crested and Short-Crested Nonlinear Random Waves,” ASME J. Offshore Mech. Arctic Eng., 135(1), p. 011103). Thus the present results are supplementary to those presented in the latter reference. An example calculation is provided.

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References

Figures

Grahic Jump Location
Fig. 1

The maximum equilibrium scour depth around the vertical pile versus m for linear waves (Slin), 2D nonlinear waves (Snonlin,2D) and 3D nonlinear waves (Snonlin,3D)

Grahic Jump Location
Fig. 2

The nonlinear to linear ratios (R1,2D and R1,3D) for 2D and 3D waves and the ratio between the 3D and 2D results (R2) versus m

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