Project: A2953 Client: East Anglia Offshore Wind Limited Title:
31 Summary
501. Following a review of the base case environment, a Navigational Risk Assessment, for the East Anglia THREE site has been undertaken. The assessment has included the collision risk modelling and a formal safety assessment for all phases of the development as well as an assessment of cumulative (and in combination) impacts.
31.1 Marine Traffic
502. An analysis of marine traffic types passing within a 10nm buffer of the East Anglia THREE site during the traffic surveys has been undertaken. The first three surveys (30 days) showed a distribution of cargo vessels (recorded most frequently) of 63%, fishing vessels which made up 15% of the traffic and then followed by recreational vessels (9%). Of the cargo vessel category, general cargo and chemical tankers were the most frequently seen. For the validation survey undertaken in 2014 (post changes to the Dutch routeing measures) vessel types were noted as cargo vessels (67.5%), fishing vessels (19%) and other operational vessels (9.5%) with the most frequent cargo types again being general cargo and chemical tankers. It was noted that this survey was a winter survey in which extreme adverse weather was noted hence the lower numbers of recreational craft.
503. Currently three main routes fully pass through the area (routes 15, 17 and 19) and have approximately one to two vessels per day on each route. Route 14 and 16 also partially intersect the East Anglia THREE site with route 16 showing one to two vessels per day and route 14 being a denser route with five vessels per day which includes north- west to south-east traffic bound from the north-east UK and ports to the Netherlands including Stena Lines Ro-Ro (Roll on Roll Off) route between Killingholme and Hoek Van Holland. The majority of the traffic on these routes is cargo (including liquid and gas tankers) with DECC vessel types showing the majority to be general cargo (34%) and chemical tankers (14%).
504. Route 17 is also transited by Ro-Ro vessels bound between Teesport and Rotterdam and operated by P&O Ferries. The most common vessel type to transit East Anglia THREE on route 17 were chemical tankers (47%) followed by general cargo vessels (36%). The Ro-Ro cargo vessel Norsky, operating on the P&O Teesport to Europort, was the most frequently recorded vessel.
505. Route 21 is used by DFDS Ro-Ros bound between Harwich and Esbjerg. The medium of this route does not pass through the East Anglia THREE site but a minor deviation may be required to maintain a safe distance. This is the only vessel to operate on this route.
506. Fishing vessel activity was recorded on AIS (93%) and Radar (7%). Overall 67 unique fishing vessels were tracked during the combined survey period. Averages of six unique fishing vessels per day were recorded within 10nm of East Anglia THREE throughout the combined 40 day survey period. The level of fishing vessel activity recorded in the area was higher during August and September 2012 and July and August 2013 surveys when an average of seven to eight unique fishing vessels were tracked per
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1 Page: 201
East Anglia THREE– Navigation Risk Assessment
www.anatec.com
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