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Large scale experimental study of the scour protection damage around a monopile foundation under combined wave and current conditions
Wu, M.; De Vos, L.; Arboleda Chavez, C.E.; Stratigaki, V.; Fazeres-Ferradosa, T.; Rosa-Santos, P.; Taveira-Pinto, F.; Troch, P. (2020). Large scale experimental study of the scour protection damage around a monopile foundation under combined wave and current conditions. J. Mar. Sci. Eng. 8(6): 417. https://hdl.handle.net/10.3390/jmse8060417
In: Journal of Marine Science and Engineering. MDPI: Basel. ISSN 2077-1312; e-ISSN 2077-1312, meer
Peer reviewed article  
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Trefwoord
    Marien/Kust
Author keywords
    offshore wind turbine; monopile; large scale experiment; scour protection design; bed shear stress; damage depth
Auteurs  Top 
  • Wu, M., meer
  • De Vos, L., meer
  • Arboleda Chavez, C.E., meer
  • Stratigaki, V., meer
  • Fazeres-Ferradosa, T.
  • Rosa-Santos, P.
  • Taveira-Pinto, F.
  • Troch, P., meer
Abstract
    This paper presents a series of large-scale wave flume experiments on the scour protection damage around a monopile under combined waves and current conditions with model scales of 1:16.67 and 1:8.33. The main objective is to compare the damage data obtained from these large-scale models with existing monopile scour protection design approaches, which were proposed based on small scale wave flume experiments, and to study the applicability of the existing approaches. The static stability (onset of motion and bed shear stress) and the dynamic stability (three-dimensional damage numbers) of the scour protection are investigated. Both results show that the existing design approaches can be conservative when applied to large scale models, which highlights the need of further investigations on scale and model effects. In addition, this paper also analyses the scour protection damage depth. It is observed that damage depths of the scour protection layer under low Keulegan-Carpenter number (KC) conditions are smaller than predictions. The study provides valuable large scale experimental data for future research on the monopile scour protection design.
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