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Development of an enhanced CPT system for Dogger Bank
Published in Guido Gottardi, Laura Tonni, Cone Penetration Testing 2022, 2022
Tor Inge Yetginer-Tjelta, Simon Bøtker-Rasmussen, Mike Rose, Tom Lunne, Vaughan Meyer, Callum Duffy
Monopiles are the primary foundation type for the Dogger Bank wind farm development. As outlined in the companion paper (Yetginer-Tjelta et al., 2022), the design of monopiles requires soil data to 40-45 m below seafloor. Furthermore, windfarm layouts are commonly only confirmed late in project execution, necessitating a rapid turnaround from turbine location definition, to the delivery of a geotechnical design basis. Due to these factors, seafloor CPTs would be the preferred solution provided that a penetration to greater than 40m can be achieved.
Which eco-maintenance for renewable energy? A simulation model for optimising the choice of offshore wind farm maintenance vessel
Published in Journal of Marine Engineering & Technology, 2023
Nicolas Tchertchian, Dominique Millet
London Array is an offshore wind farm located near the Thames estuary in the United Kingdom, off the coast of Kent, 28.6 km away (Figure 4). Meteorological data and conditions were collected from two marine buoys (buoys 62170 and 62304) (Infoclimat 2019) near the London array site over the period 2011–2016. The East Anglia wind farm is located off Norwich, about 70 km off the coast (Figure 4). Data were collected from the two oil platforms near the East Anglia site (Stations 62142 and 62145) (Infoclimat 2019) over the period 2011–2016. The Dogger Bank wind farm is located offshore Yorkshire about 200 km from the coast (Figure 4). The area in question does not have measuring buoys or marine platforms for the acquisition of wave and wind measurements. Data provided by the FINO 1 platforms (Bundesministerium fuer Umwelt n.d.) is used to model Dogger Bank weather conditions. The location of FINO1 is comparable to most sites in the United Kingdom Round 3, especially Dogger Bank, is between 125 and 290 km from the coast, with water depths between 18 and 63 m (Dowell et al. 2013). The lifetime considered for the wind farm studied is 20 years, the number of turbines is 80. The distance from the offshore wind farm to the coast is 200 km for the Dogger Bank, 70 km for East Anglia and 30 km for London Array. The simulations were carried out considering three types of wind turbines for each location: 2.3MW for WT1, 3.6MW for WT2 and 7MW for WT3 turbines. A total of nine wind farms are modelled on three geographical sites in the North Sea with different weather conditions. Average height sea (m) over the period 2011–2016 and average wind speed (m) over the period 2011–2016 are presented graphically Figure 5 and Figure 6. It is noteworthy that the strongest winds occur during the winter months resulting in wind turbines producing more electricity. On the other hand, the access to the wind turbines is more difficult due to the rough sea conditions encountered (long period swells).