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

: Sogachev, Andrey; Cavar, Dalibor; Kelly, Mark; Dellwik, Ebba; Klaas, Tobias; Kühn, Paul

Fulltext ()

Advances in science and research : ASR 17 (2020), pp.53-61
ISSN: 1992-0628
ISSN: 1992-0636
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
325832A; NEWA
New European Wind Atlas
Bundesministerium fur Wirtschaft und Energie BMWi (Deutschland)
325832B; NEWA
New European Wind Atlas
Journal Article, Electronic Publication
Fraunhofer IEE ()
wind energy; flow modelling; RANS; forests

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.