12.3 Scope
12.3.1 Study area 6.
Due to the mobile and transitory nature of marine mammals, it is necessary to examine species occurrence not only within the East Anglia THREE site and 4km buffer area, but also over the wider North Sea region. For each species of marine mammal this wider area has been defined based on current knowledge and understanding of the biology of each species, and taking account of feedback received during consultation. The proposed reference population for each receptor considered in the impact is defined in section 12.5.
7.
The status and activity of cetaceans known to occur within or adjacent to the East Anglia THREE site is considered in the context of regional population dynamics at the scale of the southern North Sea, or North Sea depending on the data available for each species and the extent of the agreed reference population.
12.3.2 Worst case 8.
This section establishes the realistic worst case scenario for each category of impact as a basis for the subsequent impact assessment. For this assessment this involves both a consideration of the relative timing of construction scenarios, as well as the particular design parameters of each project that define the project design envelope for this assessment (Table 12.2).
9.
Full details of the range of development options being considered by EATL are provided within Chapter 5 Description of Development. Only those design parameters with the potential to influence the level of impact on marine mammals are identified in Table 12.2.
10.
The realistic worst case scenarios identified here are also applied to the Cumulative Impact Assessment (CIA). When the worst case scenarios for the project in isolation do not result in the worst case for cumulative impacts, this is addressed within the cumulative section of this chapter (see section 12.7).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 12 Marine Mammal Ecology Page 7
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