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| Scour of OWT Foundations | ||||||
Scour of OWT Foundations
Seminar Details A wind farm operator commissioned MMI Engineering to carry out research into the consequences of scour around offshore wind turbine monopile foundations. The depth of scour raises two issues; firstly a potential reduction in the overall stiffness of the foundations, which could in turn lead to problems due to resonance of the turbine and structure; and secondly the structuresâ?? overall stability may be compromised. MMI gathered data and performed analyses to demonstrate the design margins relating to resonance and stability. The collected data included; design parameters, accelerometer outputs from the turbineâ??s condition monitoring systems and topographical information gathered by divers in the field. MMI built computer models of the structures which were then calibrated using observed data to give increased confidence in their accuracy. The results from the resonance analysis were used to define scour limits such that the vibration of the OWT remained within allowable limits contained in design standards. The strength analysis defined a further set of scour limits such that the foundation retained the required capacity. The study also concluded that there is the potential to gather further information regarding the depth of scour and the vibration of the OWTs to facilitate refinement of the model that could potentially allow the scour limits to be relaxed. |
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