Project: A2953 Client: East Anglia Offshore Wind Limited Title:
East Anglia THREE– Navigation Risk Assessment
www.anatec.com
voyage planning, taking into account all relevant information, should ensure a safe passage and the safety of life and the vessel should not be compromised”. The recreational sailor are likely to take due consideration for the weather conditions and passage plan accordingly to ensure safe passage. It is assumed that in adverse weather and winter periods limited recreational activity would be present within the East Anglia THREE site.
188. The air clearance between wind turbines rotors and sea level at mean conditions at MHWS would not be less than 22 metres, as per guidance and minimises the risk of interaction between rotor blades and yacht masts.
189. Effects on recreational craft are assessed in full in Chapter 15 Shipping and Navigation, section 14.7.
15.7.1 Recreational Craft Navigating Through the Array 190.
In good conditions the wind turbines should be visible. In this case, vessels, if
competently skippered, would be able to navigate safely to avoid the structures. Even if a vessel were to get into difficulty, most should be able to keep clear of the structures. However, it is noted that a proportion of recreational craft may not be able to anchor in the water depths found in and around the East Anglia THREE site and in the event of machinery failure may drift towards the windfarm due to the effects of the tide and/or wind. However it is noted that small craft is do have alternate systems such as Drogues to slow their movement.
191. The main risk of allision is considered to be in adverse weather, especially poor visibility, where a small craft could fail to see the windfarm and inadvertently end up closer than intended. If there was reduced visibility combined with adverse weather and/or strong tides, the vessel may not be able to anchor.
192. Given the ready availability of weather forecasts and growing use of Global Positioning System (GPS), the risk of a vessel being in proximity to the windfarm in adverse weather is considered to be low but not negligible. In this scenario, a vessel unable to make its way from the windfarm and at risk of allision may alert help by using a mobile phone (if signal allows), VHF or flares.
193. To minimise the risk of allision in this worst-case scenario, mitigation in line with regulator guidance would be put in place. It would be ensured, consistent with the requirements of THLS, that the structures are marked in such a way as to enhance the prospect of visual observation by passing recreational craft even in adverse conditions.
194. These measures mean that whilst the allision risk cannot be completely eliminated it would be reduced to a level as low as reasonably practicable. In terms of consequences, most allisions with the turbines should be relatively low speed and hence low energy. The turbines would be equipped with access ladders for use in emergency, placed in the optimum position taking into account the prevailing wind, wave and tidal conditions, as required by the MCA. Therefore, if the seaworthiness of the recreational craft was threatened by the impact, this should provide a place of safety or refuge until such time as
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1 Page: 84
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