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  4. Numerical modelling of the wind over forests: Roughness versus canopy drag
 
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2020
Journal Article
Title

Numerical modelling of the wind over forests: Roughness versus canopy drag

Abstract
Parameterizing the effect of vertically-distributed vegetation through an effective roughness (z0,eff) - whereby momentum loss through a three-dimensional foliage volume is represented as momentum loss over an area at one vertical level - can facilitate the use of forest data in flow models, to any level of detail, and simultaneously reduce computational cost. Results of numerical experiments and comparison with observations show that a modelling approach based on z0,eff can estimate wind speed and turbulence levels over forested areas, at heights of interest for wind energy applications (∼60 m and higher), but only above flat terrain. Caution must be exercised in the application of such a model to zones of forest edges. Advanced flow models capable of incorporating local (distributed) drag forces are recommended for complex terrain covered by forest.
Author(s)
Sogachev, Andrey
DTU Wind Energy
Cavar, Dalibor
DTU Wind Energy
Kelly, Mark
DTU Wind Energy
Dellwik, Ebba
DTU Wind Energy
Klaas, Tobias
Kühn, Paul  
Journal
Advances in science and research : ASR  
Project(s)
NEWA
NEWA
Funder
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)  
Bundesministerium für Wirtschaft und Energie BMWi (Deutschland)  
Open Access
DOI
10.5194/asr-17-53-2020
Language
English
Fraunhofer-Institut für Energiewirtschaft und Energiesystemtechnik IEE  
Keyword(s)
  • wind energy

  • flow modelling

  • RANS

  • forests

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