Project: A2953 Client: East Anglia Offshore Wind Limited Title:
East Anglia THREE– Navigation Risk Assessment 5 Marine Navigational Markings
5.1 Introduction 28. Throughout the life of the project marine navigational marking would be provided in accordance with the THLS requirements, which would comply with IALA Recommendation O-139 on the Marking of Offshore Wind Farms (IALA, 2008) and the additional requirements of MCA MGN 371 (MCA, 2008a).
29. Aviation lighting would be as per Civil Aviation Authority (CAA) requirements; however it is likely that specific requirements will be made with regards to flash sequences and Search and Rescue (SAR) lighting.
5.2 Construction/Decommissioning
30. During the construction / decommissioning of an offshore windfarm, working areas would be established and marked in accordance with the IALA Maritime Buoyage System (MBS). In addition to this, where advised by THLS, additional temporary marking would be applied.
31. Notices to Mariners, Radio Navigational Warnings (Navtex) and / or broadcast warnings would be promulgated in advance of and during construction / decommissioning of any individual structure / windfarm.
32. The markings for the proposed East Anglia THREE site would be agreed in consultation with THLS once the final turbine layout has been selected
5.3 Marking of Individual Structures
33. The tower of every wind generator would be painted yellow all around from the level of Highest Astronomical Tide (HAT) to 15m or the height of the Aid to Navigation, if fitted, whichever is greater.
34. As per MGN 371, each of the structures would be marked with clearly visible unique identification characteristics at a location that is easily and readily serviceable. The identifications characteristics would each be illuminated by a low-intensity light, so that the sign is visible from a vessel thus enabling the structure to be identified at a suitable distance to avoid a collision with it. This would be such that under normal conditions of visibility and all known tidal conditions, they are clearly readable by an observer (with naked eye), stationed three metres above sea levels, and at a distance of at least 150 metres from the turbine. The light would be either hooded or baffled so as to avoid unnecessary light pollution or confusion with navigation marks.
35. Turbines would also comply with CAA however it is likely that THLS would require Morse W. Agreement on which turbines will be marked would be required upon final site design.
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1 Page: 13
www.anatec.com
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