Project: A2953 Client: East Anglia Offshore Wind Limited Title:
East Anglia THREE– Navigation Risk Assessment 26.7 Effects Associated with Collision and Allision Modelling
409. Vessel to vessel collisions may increase in the high density areas noted to the north or south of the East Anglia THREE site due to routes altering from their base case routes , which currently intersect the site, to deviate north or south (relevant to both 100% and partial fill designs). With consideration for the deviations and accumulation of traffic, increases in collision risk are expected to be negligible overall due to the lower densities of traffic on the deviated routes and mitigated by embedded mitigations and good practice such as continuous compliance with COLREGs including conduct of vessel in restricted visibility, following safe speed principles and compliance for the ‘give way’ rules including crossing, head on and vessel type.
410. The majority of this risk was noted on the southern boundary and was to some degree due to the inclusion of larger structures (substations) on the peripheral boundary and the convergence of a number of deviated routes (combination of routes 13 and 14 could see approximately 13-14 vessels per day transiting past the southern boundary). Following assessment of these allision modelling results the structures would now be located inter row within the array which would reduce the overall allision risk for the development. It is also noted that in practice it is likely that vessels would increase their passing distance due to the available sea room and not route on the worst case passing distances (2nm) as used within the model.
411. Also following work already undertaken at a zonal level the proposed East Anglia THREE project has been designed to take consideration of both DWRs and the traffic using them agreeing with stakeholders a 2nm buffer to the east and 1nm to west of the site allowing sufficient sea room for the routes to be safely used and prevent crossing encounters or collisions associated with east – west traffic and the DWRs by allowing sufficient sea room for vessels to visually and electronically acquire targets before crossing the DWR.
www.anatec.com
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1
Page:
170
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