af12012f-583c-472d-8952-18993f35bc13 English series series 2026-09-15T10:23:06 MEDIN 3.1.2 biota Bird counts SeaDataNet Parameter Discovery Vocabulary 2026-06-19 revision Bird behaviour SeaDataNet Parameter Discovery Vocabulary 2026-06-19 revision Consenting The Crown Estate Renewable Energy Development Phases 2012-05-15 revision Agreement for Lease Area The Crown Estate Renewable Energy Development Areas 2012-05-15 revision Species distribution GEMET - INSPIRE themes, version 1.0 2009-07-31 revision SeaDataNet sea areas 2012-11-07 revision North Sea SeaVoX Vertical Co-ordinate Coverages 2020-05-21 revision atmosphere 2007-08-01T00:00:00 2007-08-01T00:00:00 0.447657201555526 0.52389494189844 53.1644804509372 53.2713172395977 TCE-885 Marine Data Exchange 2007, Ecofys, Lincs, Bird Collision Risk Modelling Bird Collision Risk Modelling 2007-08-01T00:00:00 creation 2021-05-17T13:46:27 publication English This series focuses on the methods used and results generated by collision risk modelling for pink-footed geese in the greater Wash. It is possible to estimate mortality rates of birds passing through a wind farm given key parameters of the placement, dimension and operation of the wind turbines and the movements, abundance and behaviour of the birds. This has lead to the development of collision risk models. For an offshore site, the data to estimate the abundance (and movements) of the birds should preferably come from boat-based surveys. In the boat-based surveys ‘snapshots’ are used to quantitatively assess flying birds. Snapshots are predefined moments during the survey at which all flying birds within a certain distance from the surveyor are recorded. From the snapshot data one can calculate the density of birds in flight (e.g. number of flying birds per square km). However, with Pink-footed geese (PG) there is a (potential) problem with this methodology. This is due to the fact that very few PG have been recorded in snapshots. In the 19 boat-based surveys for the offshore wind farms Lynn and Inner Dowsing (LID), only 5 PG were recorded in snapshots during a single survey in November 2003. Similar results were found in the boat-based surveys for the Lincs offshore wind farm: 54 PG in a single survey in September 2004, out of 33 boat-based surveys. During the boat-based surveys for Docking Shoal OWF not a single PG was recorded in snapshots in any of the 39 surveys. The statistical validity of collision risk modelling based on the incidental records of Pink-footed geese in or near LID or Lincs is therefore questionable at best. There is an alternative approach. The Pink-footed geese pass through the Greater Wash during the migration to and from their overwintering ground in Norfolk. A reasonable estimate of the annual passage rate of PG through a wind farm site can be made on the basis of the maximum number of PG recorded overwintering in Norfolk, and some reasonable assumptions on the flight corridor along the Lincolnshire Coast. In this report the results from both approaches are presented. It was found that compared to the mortality rates calculated based on the site specific boat-based surveys, the calculated total mortality rate based on the maximum regional population is about a factor of two higher. Origin: ECON There will be no limitations when published on the Marine Data Exchange otherRestrictions Data Must be used in accordance to the Marine Data Exchange's Terms of Use: https://www.marinedataexchange.co.uk/content/info/terms-of-use otherRestrictions The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk custodian Ecofys Netherlands B.V. +31 (0)30 662 3300 info@ecofys.com originator The Crown Estate +44 020 7851 5000 enquiries@thecrownestate.co.uk distributor Orsted info@orsted.com owner notPlanned Documents https://www.marinedataexchange.co.uk/details/TCE-885/summary A link to the web service or dataset. https://www.marinedataexchange.co.uk A link to the general host site. Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08T00:00:00 publication Conformity with the Commission Regulation (EU) No 1089/2010 was either not relevant to this dataset or not a requirement of the Marine Data Exchange for the creation and submission of this dataset; therefore, conformity has not been assessed and cannot be declared False series The collision risk model used in this assessment is the model developed by Scottish National Heritage and British Wind Energy Association (Percival et al. 1999, Band 2000), taking into account the appraisal of this model by the British Trust for Ornithology (Chamberlain et al. 2005). Centrica Renewable Energy Limited GIS and Data Manager 01753 492188 renewables@centrica.com pointOfContact EPSG Geodetic Parameter Registry 2022-11-29 revision WGS 84