Project: A2953 Client: East Anglia Offshore Wind Limited Title:
East Anglia THREE– Navigation Risk Assessment and the increase in collision risk from the pre-windfarm scenario.
Table 28.5 Vessel-to-Vessel Collisions – Cumulative Scenario
Partial Fill of East Anglia ONE, East Anglia THREE and East Anglia FOUR
100% Fill of East Anglia ONE, East Anglia THREE and East Anglia FOUR
Collision
Frequency 2.49E+00
2.51E+00
Increase from Pre- Windfarm Scenario
9.36E-03 (0.94%)
1.41E-02 (1.41%)
484. Based on vessel-to-vessel collision risk modelling of the revised traffic pattern for each of the two scenarios, the changes in collision frequency due to the windfarm development is estimated to be 9.36x10-03 per year for the partial fill build scenario and 1.41x10-02 for the 100% fill build scenario. This represents a 0.94% increase (partial fill build scenario) and 1.41% increase (100% fill build scenario) from the pre windfarm vessel-to-vessel collision risk for the area considered.
485. Table 28.6 presents the powered vessel-to-structure allision risk for the cumulative developments and plots showing the passing powered allision frequency for each structure within the partial fill build scenario and 100% fill build scenario. These are presented in Figure 28.4 and Figure 28.5 respectively.
Table 28.6 Powered Vessel-to-Structure Allisions - Cumulative Scenario
Annual Allision Frequency
Partial Fill of East Anglia ONE, East Anglia THREE and East Anglia FOUR
100% Fill of East Anglia ONE, East Anglia THREE and East Anglia FOUR
3.37E -02 2.03E -02
Allision Return Period 1 every 30 years 1 every 49 years
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Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1
Page:
193
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