Experimental Study of Wave Run-Up on Tripod Offshore Wind-Turbine Foundations
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 147, Issue 2
Abstract
For the design of offshore wind turbines, the airgap height of a service platform above still water level (SWL) is dependent on the maximum level of wave run-up in seas. A number of laboratory model tests were carried out in a wave flume to evaluate and predict the wave run-up on a tripod foundation in regular and irregular waves. Comparison of the measured data with the predictions by existing methods revealed that the empirical formulae for wave run-up on monopile foundations cannot straightforwardly be applied to the tripod foundation for the sake of more complex structural geometry and associated hydrodynamics. Hence, the run-up coefficients m for measured regular and irregular wave run-ups are derived with the velocity stagnation head theory and then fitted against wave steepness. The hindcast results using the fitted m show good agreement with measurement, thus enabling fast prediction of wave run-ups on tripod foundations in practice. In addition, an exceptionally large wave-up has been recorded in the irregular wave tests, which affirms the occurrence of a similar phenomenon in Horns Reef 1 wind farm some years ago.
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Acknowledgments
This research is sponsored by Key Laboratory of Far-shore Wind Power Technology of Zhejiang Province of China (ZOE2020010), China National Science Foundation (Grant No. 51579227) and the China National Key Research Scheme 2016YFC0303706.
References
Andersen, L. T., P. Frigaard, M. L. Damsgaard, and L. De Vos. 2011. “Wave run-up on slender piles in design conditions—Model tests and design rules for offshore wind.” Coastal Eng. 58 (4): 281–289. https://doi.org/10.1016/j.coastaleng.2010.10.002.
Andersen, L. T., P. Frigaard, M. R. Rasmussen, and L. Martinelli. 2010. “Loads on wind turbines access platforms with gratings.” In Proc., 32nd Int. Conf. on Coastal Engineering, 1–15.
Battjes, J. A., and H. W. Groenendijk. 2000. “Wave height distributions on shallow foreshores.” Coastal Eng. 40 (3): 161–182. https://doi.org/10.1016/S0378-3839%2800%2900007-7.
De Vos, L., P. Frigaard, and J. De Rouck. 2007. “Wave run-up on cylindrical and cone shaped foundations for offshore wind turbines.” Coastal Eng. 54 (1): 17–29. https://doi.org/10.1016/j.coastaleng.2006.08.004.
Fenton, J. D. 1990. “Nonlinear wave theories.” In The Sea, Vol. 9 of Ocean engineering science, edited by B. Le Méhauté, and D. M. Hanes, 1–19. New York: Wiley.
Hallermeier, R. J. 1976. “Nonlinear flow of wave crests past a thin pile.” J. Waterway, Port, Coastal, Ocean Eng. 102 (4): 365–377.
Kriebel, D. L. 1990. “Nonlinear wave interaction with a vertical circular cylinder, Part I: Diffraction theory.” Ocean Eng. 17 (4): 345–377. https://doi.org/10.1016/0029-8018%2890%2990029-6.
Kriebel, D. L. 1992a. “Nonlinear wave interaction with a vertical circular cylinder, Part II: Wave run-up.” Ocean Eng. 19 (1): 75–99. https://doi.org/10.1016/0029-8018%2892%2990048-9.
Kriebel, D. L. 1992b. “Nonlinear wave run-up on large circular cylinders.” In Civil Engineering in the Oceans, 173–187. Reston, VA: ASCE.
Le Méhauté, B. 1960. An introduction to hydrodynamics and water waves. Berlin: Springer Science & Business Media.
MacCamy, R. C., and R. A. Fuchs. 1954. Wave force on piles: A diffraction theory, 1–17. Technical Memorandum No. 69. Washington, DC: Beach Erosion Board Office of the Chief Engineers, Dept. of Army.
Martin, A. J., W. J. Easson, and T. Bruce. 2001. “Run-up on columns in steep, deep water regular waves.” J. Waterway, Port, Coastal, Ocean Eng. 127 (1): 26–32. https://doi.org/10.1061/%28ASCE%290733-950X%282001%29127:1%2826%29.
Myrhaug, D., and L. E. Holmedal. 2010. “Wave run-up on slender circular cylindrical foundations for offshore wind turbines in nonlinear random waves.” Coastal Eng. 57 (6): 567–574. https://doi.org/10.1016/j.coastaleng.2009.12.003.
Niedzwecki, J. M., and A. S. Duggal. 1992. “Wave runup and forces on cylinders in regular and random waves.” J. Waterway, Port, Coastal, Ocean Eng. 118 (6): 615–634. https://doi.org/10.1061/%28ASCE%290733-950X%281992%29118:6%28615%29.
Niedzwecki, J. M., and J. R. Huston. 1992. “Wave interaction with tension leg platforms.” Ocean Eng. 19 (1): 21–37. https://doi.org/10.1016/0029-8018%2892%2990045-6.
Ramirez, J., P. Frigaard, T. L. Andersen, and L. De Vos. 2013. “Large scale model test investigation on wave run-up in irregular waves at slender piles.” Coastal Eng. 72: 69–79. https://doi.org/10.1016/j.coastaleng.2012.09.004.
Stansberg, C. T. 1998. “Non-Gaussian extremes in numerically generated second-order random waves on deep water.” In Proc., 8th ISOPE Conf., 103–110.
Stansberg, C. T., R. Baarholm, T. Kristiansen, E. W. M. Hansen, and G. Rortveit. 2005. “Extreme wave amplification and impact loads on offshore structures.” In Offshore Technology Conf., 1–10.
Vinje, T., and S. Haver. 1994. “On the non-Gaussian structure of ocean waves.” In Vol. 2 of Proc., 7th BOSS Conf., 453–480. Cambridge, MA: MIT.
Zheng, X. Y. 2013. “Random wave forces on monopile wind turbine foundations: A comparison of wave models.” In Proc., ASME 32nd Int. Conf. on Ocean, Offshore and Arctic Engineering, 1–7.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 147 • Issue 2 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Oct 29, 2019
Accepted: Aug 10, 2020
Published online: Nov 19, 2020
Published in print: Mar 1, 2021
Discussion open until: Apr 19, 2021
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