This content requires Adobe Flash Player version
or later.
Either you do not have Adobe Flash Player installed,
or your version is too old,
or there is a problem with your Flash installation and we were unable to detect it.
4 COLLISION RISK MODEL PARAMETERS FOR THE EAST ANGLIA THREE WINDFARM
14. The WCS is the layout that was considered to have the greatest potential impact. For collision risk this is the proposed layout of 172 wind turbines of 7MW with a 154m diameter rotor turbine specification.
15. To run the Basic Band CRM Option 1 with site-specific flight height data the results of the 2011 to 2013 site surveys were used to estimate the monthly density of birds in flight for each species within the East Anglia THREE site. Information across all survey months was collated to provide an average estimate of the proportion of those birds in flight at PCH (Tables 4.1 and 4.2). To run the Basic Band CRM Option 1 with generic flight height data the spreadsheet “Final_Report_SOSS02_FlightHeights3” from the SOSS 02 Project (Cook et al. 2012) was used to derive the PCH for each species. To run the Extended Band CRM Option 3 the spreadsheet that runs the extended model was used and this contains embedded within it information on the variation of probability of birds flying at specific heights within the PCH and the probability of being struck at specific heights within the PCH.
16. Table 4.1 presents the CRM species input parameters for the selected seabirds and migrant seabirds. Species biometrics were obtained from Robinson (2005) and the nocturnal activity rate was based on a 1 to 5 scoring index for each species in Garthe and Hüppop (2004) or King et al. (2009), with the spreadsheet converting these factors into daytime activity as follows; 1 = 0%, 2 = 25%, 3 = 50%, 4 = 75%, 5 = 100%. The number of available daylight hours is calculated within the CRM spreadsheet (Band 2012) based on the latitude of the windfarm development.