Stability of Scour Protection around Offshore Wind Turbines in Current
This scientific poster was presented at the 4th INORE symposium, which was held in Dartmouth, England, on 9-14 May 2010
Abstract: The goal of the work is to gain an understanding of the mechanisms that cause sinking of the scour protection around monopiles. The project started with data from Horns Rev I Offshore Wind Farm. Horns Rev I is located in relatively shallow water about 20 km off the Danish West Coast in the harsh environment in the North Sea. Three years after installation a control survey showed that the scour protections adjacent to the monopiles sank up to 1.5 m (no sinking was expected).An extensive program of physical model tests is being carried out, including velocity measurements, flow visualizations and live bed tests to describe the sinking process. The tests include steady current, waves and combined waves and current. Dierent designs of scour protections are tested and the sinking recorded. A return current upstream of the pile (horseshoe vortex) in between the stones have been identied in case of steady current. The results of the model tests show that the horseshoe vortex may explain the sinking of the scour protection at Horns Rev I. Recommendations on how to reduce the sinking will be given and, if possible, design methods eliminating the sinking will be given, as well.
Keywords: scour protection, sinking, monopiles, current, waves
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