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8.2 Wave 71. Significant wave height data for the area is presented in Figure 8.3.
100%
20% 40% 60% 80%
0% 0 1 2 3 4 Significant Wave Height (m)
Figure 8.3 Significant Wave Height Exceedence Curve 72. Therefore, the frequency of average wave height exceeding 5m is approximately 0.5%.
8.3 Visibility
73. Historically, visibility has been shown to have a major influence on the risk of vessel collision. The annual average probability of bad visibility (defined as less than 1km) for the UK North Sea is approximately 0.03, i.e., an average of 3.0% of the year (UKHO, 2011).
Date: Doc:
07.05.2014 A2539 East Anglia THREE Windfarm Appendix 15.1 Page: 37 5 6 15 20 25