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Seabird Species Input Parameters for Collision Risk Modelling in the East
Anglia THREE site Species
Proportion Flying at PCH (%) from Site- specific Data (Basic
CRM Option 1 with
Fulmar Gannet
Arctic Skua Great Skua Kittiwake
Lesser Black- backed Gull
Great Black- backed Gull
Herring Gull Arctic Tern
Common Tern
specific PCH) 0.56%
6.50% n/a n/a
13.52% 28.95%** 33.33%
20.00%** n/a n/a
Band site-
Proportion Flying at PCH (%) from SOSS 02 Data (Basic Band CRM Option 1 with generic PCH)
0.21% 6.04% 0.02% 0.03%
11.37% 22.38%
28.36%
24.05% 0.03% 0.07%
Body Length (m)
Wingspan (m)
Flight Speed
(ms-1)
Nocturnal Activity Factor*
(1 to 5)
0.48 0.94 0.44 0.56 0.39 0.58
0.71 0.60 0.33
1.07 1.72 1.18 1.36 1.08 1.42
1.58 1.44 0.88
13
14.9 13.3 16.0 13.1 12.3
13.0 9.9 10.5
4 2 1 1 3 3
3 3 1
Table Notes: *The CRM spreadsheet converts this factor from 1 to 5 into 0% / 25% / 50% / 75% / 100% daytime activity respectively. ** = sample size below 100 flying individuals. n/a = modelled as migrant only using Basic Band CRM Option 1 with generic PCH.
17. The determination of the rotor strike probability for each species, that is part of the overall CRM process, is calculated in the CRM spreadsheet (Band 2012) based on each species flying in a straight line along the longest length of the windfarm. It incorporates the calculation of rotor strike probability for both upwind and downwind flights and the associated change in mortality risks.
18. Input parameters for the wind turbine specifications used within the CRM are shown in Table 4.2. EATL provided the data on theoretical maximum operational times for the proposed East Anglia THREE project’s wind turbines (Table 4.2), which have been incorporated into the CRM. These times represent a theoretical maximum or WCS, as they do not account for any downtime that is required for wind turbines during planned and unplanned servicing or maintenance.