Point


Table 7.2.2. Schedule of return-period metocean conditions (Noble Denton, 2011) Lat °N


Lon °E Depth (m LAT)


03 03 03 03


52.665 52.665 52.665 52.665


2.884 2.884 2.884 2.884


30.8 30.8 30.8 30.8


Return period (years)


1


10 50


100


Surge (m)


1.6 2.0 2.3 2.4


Hs (m)


Tp (s)


Uc (m/s)


6.0 6.8 7.3 7.5


11.1 11.8 12.3 12.5


1.3 1.4 1.4 1.5


67. Across the majority of the East Anglia Zone, water depths are likely to be sufficient to limit the effect of wave action on sea bed sediments, apart from during exceptionally stormy seas or over shallower areas.


68. Wave data measured by the Waverider buoy in 43m water depth located within the proposed East Anglia THREE windfarm site between 4th December 2012 and 24th October 2013 have been analysed to determine the dominant wave heights, periods and directions (Further information is provided in Appendix 7.5).


69. Diagram 7.2.5 shows the wave rose derived from the Waverider buoy data. In keeping with the findings from analysis of data collated during the Zonal Environmental Appraisal (ABPmer 2012a) in the vicinity of the East Anglia THREE site, the waves mimic, to some extent, the dominant wind regime for the zone, with a considerable percentage of the waves arriving from the south-west. The next most significant grouping of waves arrive from the north-east, as a result of swell waves generated further afield in the North Sea. Waves can, however, approach from all directions.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Appendix 7.2 Page 17


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