Wind farm wakes from SAR and doppler radar

Tobias Torben Ahsbahs*, Nicolai Gayle Nygaard, Alexander Newcombe, Merete Badger

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

We retrieve atmospheric wake characteristics at the wind farm Westermost Rough from Sentinel-1 Synthetic Aperture Radar (SAR) images. For the first time, co-located reference measurements of the full flow field around the wind farm are available from Doppler radars. One case with a reference measurement of up to 10 km downstream of the wind farms shows that SAR images depict the wake better close to the wind farm than further downstream. The comparison of two cases with similar wind speed and direction indicate that under unstable atmospheric stratification, we can retrieve the structure of the wake field close to the wind farm from SAR, while this was not possible for a case with stable stratification. We find that openly available Sentinel-1 image archives can be used to study the structure of wind farm wakes depending on the atmospheric stability conditions. From an average of twelve available co-located cases, we find that velocity deficits at the wind turbine hub height are 8% from Doppler radar measurements and 4% from SAR wind retrievals.
Original languageEnglish
Article number462
JournalRemote Sensing
Volume12
Issue number3
Number of pages22
ISSN2072-4292
DOIs
Publication statusPublished - 2020

Keywords

  • Synthetic Aperture Radar (SAR)
  • Wind energy
  • Doppler radar
  • Wind farm wakes
  • Satellite winds

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