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Offshore wind farm wake recovery: Airborne measurements and its representation in engineering models

Cañadillas, Beatriz; Foreman, Richard; Barth, Volker; Siedersleben, Simon; Lampert, Astrid; Platis, Andreas; Djath, Bughsin; Schulz‐Stellenfleth, Johannes; Bange, Jens; Emeis, Stefan; Neumann, Thomas

Abstract (englisch):
We present an analysis of wind measurements from a series of airborne campaigns conducted
to sample the wakes from two North Sea wind farm clusters, with the aim of determining
the dependence of the downstream wind speed recovery on the atmospheric stability. The
consequences of the stability dependence of wake length on the expected annual energy yield of
wind farms in the North Sea are assessed by an engineering model. Wakes are found to extend
for significantly longer downstream distances (>50 km) in stable conditions than in neutral and
unstable conditions (<15 km). The parameters of one common engineering model are modified
to reproduce the observed wake decay at downstream distances >30 km. More significant
effects on the energy yield are expected for wind farms separated by distances <30 km, which
is generally the case in the North Sea, but additional data would be required to validate the
suggested parameter modifications within the engineering model. A case study is accordingly
performed to show reductions in the farm efficiency downstream of a wind farm. These results
emphasize not only the importance of understanding the impact of atmospheric stability on
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Preprint §
DOI: 10.5445/IR/1000118765
Veröffentlicht am 28.04.2020
Originalveröffentlichung
DOI: 10.1002/we.2484
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung - Atmosphärische Umweltforschung (IMK-IFU)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 15.04.2020
Sprache Englisch
Identifikator ISSN: 1095-4244, 1099-1824
KITopen-ID: 1000118765
HGF-Programm 12.02.04 (POF III, LK 01)
Urban-Rural Interactions
Erschienen in Wind energy
Band 23
Heft 5
Seiten 1249–1265
Projektinformation WIPAFF; TP (BMWi, 0325783A)
Vorab online veröffentlicht am 18.02.2020
Schlagwörter wind energy, atmospheric stability, offshore wind farm cluster, wake recovery, wind farm efficiency
Nachgewiesen in Web of Science
Scopus
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