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Why a bird behaviour study is changing how we think about offshore wind development

Learnings from an Aberdeen offshore ornithology study could help advance the challenging EIA (Environmental Impact Assessment) stage of offshore wind farm consenting/permitting.

 

29 September 2021 | 5 min read
Dr Simon Zisman
ON THIS PAGE
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RPS ornithology - gannet in flight
Image credit: Mike Armitage

Since 2019, we have been working with our partners, Denmark-based DHI Group, on a study commissioned by Vattenfall of bird flight behaviour around offshore wind turbines. The research is intended to improve knowledge of the offshore environment and help improve the accuracy of offshore wind-related environmental assessment and planning.

The study uses integrated radar technology, software-linked to cameras, to monitor the flight patterns of gannets, kittiwakes and large gulls flying through and close to the wind farm. It delivers data on bird tracks (where the birds fly), as well as very detailed behavioural information about how they approach turbines.

This study is so important because of the uncertainty around bird behaviour – a factor that makes Environmental Impact Assessments more difficult and creates a challenge for offshore wind consenting. This in turn creates a potential barrier to offshore wind sector growth, so the Vattenfall Aberdeen study has three important and positive potential impacts:

1) Resolving uncertainties and decreasing the possibility of overestimating effects on seabirds in the EIA stage

2) Reducing risk in the consenting process

3) Improving the ‘consentability’ of potential development sites.

Having completed the first full year of monitoring and analyses, our report is now available to read on the EOWDC (European Offshore Wind Deployment Centre) hub.

Related read: discover more about Research & Development for renewables at RPS

  • RPS monitoring equipment in situ.jpg

    Image shows study equipment in situ, monitoring bird behaviour at the Aberdeen wind farm.

  • RPS monitoring equipment at the turbine base.jpg

    Image shows study equipment situated at the base of the turbine, monitoring bird behaviour at the Aberdeen wind farm.

  • Birds around a wind farm.jpg

    Image shows birds in and around one of the turbines at the Aberdeen wind farm.

  • RPS monitoring equipment in situ.jpg
  • RPS monitoring equipment at the turbine base.jpg
  • Birds around a wind farm.jpg

Advancing the study of offshore bird behaviour

The Aberdeen study’s focus is on improving the behaviour models used to predict wind farms’ effects on birdlife, aiming to achieve greater accuracy and understanding in that process. (This could help decrease the complexity of steps and margin for error that currently exists in the EIA.)

The technological scope of the project has also widened as AI has been brought in to solve the problem of ‘empty videos’, where the camera’s motion trackers would be confused by other objects in the field of view. On average, researchers would initially review several thousand study videos per month, but cameras could be triggered by unrelated motion, such as boats, waves or turbine rotor movements. Introducing an advanced motion tracker with AI that recognises birds meant that the intensive review process could be cut down to several hundred videos, all relevant and featuring bird activity. The AI is also in-situ, integral to the system, rather than needing to be processed offline as a separate stage. All this makes a clear case for R&D and technological investment to speed up and improve the baseline study processes related to offshore wind development.

Avoidance behaviours of birds in relation to offshore wind farms and turbines

Although there is another year to go on the study and more data coming in, early analysis suggests strong meso avoidance response in the study species – spending time within the farm but avoiding the space closer to the turbines. We have also learnt more about the change in behaviour, such as flight speed and flight height, as birds approach closer to turbines. Information such as this helps to refine our understanding of how birds are affected by wind farms and to open the door to further development. The study can also help us understand the potential rates of collision with turbines, suggesting that this could be much lower than is often predicted in EIA estimates. We will publish further updates when the study concludes at the end of 2021.


Related read:
the RPS model developed to illustrate relative vulnerability of habitats and species for U.S. offshore wind

RPS ornithology - a group of gannets in flight

The importance of R&D funding and collaborations within the offshore wind sector

Other aspects illustrated by this project are the importance of funding for research and the value of collaboration at central government and agency level.

The RPS and DHI study is part of the €3 million Scientific Research and Monitoring Programme, funded by Vattenfall’s EOWDC test and demonstration facility. The programme is believed to be the largest research programme of its kind and has also been awarded up to €40 million of funding by the European Union. Other offshore wind-related projects funded by the programme include a look at socio-economic impact on the human environment (focussed on the local economy and communities near offshore wind farms) and a study of the migration routes and wintering areas of guillemots and razorbills.

The EOWDC itself was developed with the involvement of the Scottish government, which guided on establishing the programme and the scientific panel that defined its focus areas and priorities. Panel members represented a wide range of agencies, from Swedish energy company Vattenfall and Aberdeen Renewable Energy Group to Marine Scotland Science, NatureScot (formerly Scottish Natural Heritage), the Scottish Environment Protection Agency and The Crown Estate. As the offshore wind sector recognises the need to remove barriers to development while enabling environmentally robust assessment and the raising of research standards, collaboration is proving to be a key theme.

For RPS, the Aberdeen study means an opportunity to extend our expertise in ways that will help our clients build more effectively and sustainably, while feeding greater technical and ecological understanding into offshore wind development, which will ultimately benefit the environment.

For more information about RPS ornithology, contact Dr Simon Zisman, Senior Director, Ecology.

 

Additional related content: Research and development articles and case studies