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A study of scale effects in experiments of monopile scour protection stability
Wu, M.; De Vos, L.; Arboleda Chavez, C.E.; Stratigaki, V.; Whitehouse, R.; Baelus, L.; Troch, P. (2022). A study of scale effects in experiments of monopile scour protection stability. Coast. Eng. 178: 104217. https://dx.doi.org/10.1016/j.coastaleng.2022.104217
In: Coastal Engineering: An International Journal for Coastal, Harbour and Offshore Engineers. Elsevier: Amsterdam; Lausanne; New York; Oxford; Shannon; Tokyo. ISSN 0378-3839; e-ISSN 1872-7379, more
Peer reviewed article  

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Author keywords
    Monopile; Scour protection; Scale effects; Best Model; Shear failure; Damage; Damage number

Authors  Top 
  • Wu, M., more
  • De Vos, L., more
  • Arboleda Chavez, C.E., more
  • Stratigaki, V., more
  • Whitehouse, R.
  • Baelus, L., more
  • Troch, P., more

    Small scale hydraulic experiments are widely used to model the stability of a scour protection around an offshore monopile foundation. Knowing the associated scale effects is important for evaluating the validity of the obtained experimental and design results. This paper provides a quantification analysis of scale effects that exist in monopile scour protection experiments, with a focus on the shear damage of a dynamically stable scour protection. Large scale models (scale ratio 1:8.33 and 1:16.67) and similar small scale models (scale ratio 1:50) have been adopted in the experiments with waves against current hydrodynamic conditions applied. For the waves and current conditions, the Froude scaling rule is used; for the armour stones, the so-called Best Model scaling rule suggested by Hughes (1993) is used. The scaling scheme achieves similarities between large and small scale models with regard to Shields number, relative density, geometry and settling velocity of particle. The scour protection damage patterns are measured and the three dimensional damage numbers are analysed. For better comparing the small and large scale test results, the small scale tests are performed repeatedly to obtain reliable damage results with associated range of deviation. Visual assessment of the damage patterns shows some agreements between small and large scale tests with regard to the damage and accretion locations. However, detailed analysis shows that the small scale tests introduce higher global and subarea damage numbers compared to large scale tests. The damage areas in small scale tests are larger than that in large scale tests. Significant lee-side damage due to the presence of lee-wake vortices is found in small scale tests. The dissimilarities of pile Reynolds number (R-e,D-p), ratio between Shields numbers (theta(max)/theta(cr)) and vortex shedding frequency in the different scaled models are believed to be the primary reasons of obtained scale effects.

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