Impact Operation
Impact 1: Physical disturbance and loss of sea bed habitat
The maximum estimated area of disturbance during operation is
difficult to predict at this stage of the project. 1.
It has been estimated that a maximum of two visits by jack-up vessels to the East Anglia site per day with a footprint of 1,200m2 would form the majority of the physical disturbance during operation this would lead to a total area of up to 0.88km2 per year (the equivalent of 0.2% of the East Anglia THREE site).
2. There may be the need to perform maintenance operations on electrical cables during the lifetime of the project however, it is impossible to predict at this stage of the project what the likely area of disturbance may be for these activities.
The total area of habitat loss during operation is calculated based on
1. 60m gravity base foundations and scour protection calculated as 25,500m2 per foundation (see Chapter 7 Marine Geology, Oceanography and physical processes Table 7.4). Therefore for 106 foundations (see Rationale column) the maximum area of disturbance would be 2.68km2.
2. The gravity base foundation and scour protection footprint for two meteorological masts would be 0.01km2.
3. Cable protection for cable crossings within the array 0.0007km2 4. Cable protection for up to 550km inter-array cables and 195km HVAC export cables between collector and converter station (assuming 10% of cable length requires protection and that the cable protection is 6m in width) would result in a footprint of up to 0.45km2.
Total footprint during operation within the East Anglia THREE site is
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 11 Fish and Shellfish Page 15
The maximum area for physical disturbance during operation is calculated. This area would be only temporarily disturbed and would rapidly recover.
Worst case parameter for assessment
Rationale
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