Dynamic behaviour of suction caissons

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2 Chapter 1 – Introduction 1.2 Foundations for offshore wind turbines The actual selection of type of foundation for a wind turbine or wind turbine park is governed by several factors. The choice of the particular design usually depends on following factors (Feld 2004): Soil condition Water depth Possible erosion Size and type of wind turbine Environmental conditions (wave height,current, ice, etc.) Economics and politics! The recent major offshore wind farm projects in Europe have been dominated by two types of foundation solutions: the gravitational foundation and the monopile. The monopile solution has been used at Horns Rev, Samsø, North Hoyle and Kentish Flats, whereas the offshore projects at Nysted and Middelgrunden are based on gravitational foundations. In future projects at increasing water depths and/or with greater wind turbines tripod foundations or jackets may become practicable. Moreover, a five-year research and development project at Aalborg University has proven the novel principle of the suction caisson to be feasible in suitable soil conditions in water depth from near shore to approximately 40 meters. The concepts for offshore wind turbine foundations at relatively shallow waters (0 - 50 m) are sketched in Figure 1.1. Each concept is presented in the following subsections. Floating offshore wind turbines are not included, see e.g. Bulder et al. (2003) and Hydro (2005) for details. Morten Liingaard
1.2 Foundations for offshore wind turbines 3 Figure 1.1: Concepts for offshore wind turbine foundations at relatively shallow waters. From left to right: Gravity based, suction caisson, monopile and tripod foundation. December 4, 2006
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76 BIBLIOGRAPHY Brincker, R. and P.
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Dynamic behaviour of suction caissons

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