Scour Protection around Offshore Wind Turbine Foundations, Full-Scale Measurements (original) (raw)

Abstract

The major challenge of ensuring the stability of the seabed around offshore wind turbine foundations is addressed in the present paper. Full-scale, high-resolution measurements of the seabed and the scour protection around the monopile foundations in Horns Rev offshore wind farm are analysed and presented. The measured developments in the scour protection are related to wave and current conditions. The wind turbines at Horns Rev wind farm are each placed on circular monopiles at water depths ranging from 6-13 m at MSL. The seabed consists of fine to coarse sand (D50 = 0.15-1 mm). The wave conditions are severe - the largest waves are in the order of 8 m high. The max current in the wind farm area is approximately 0.88 m/s (50 year return period). The stability of the seabed around the wind turbine foundations is one of the major challenges in offshore wind farm design. Each foundation at Horns Rev is protected by a 50 cm thick filter layer (D50 = 10 cm) and a 1 m thick armour layer ...

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