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

Parameterizing the effect of vertically-distributed vegetation through an effective roughness (inline-formulaz0,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 inline-formulaz0,eff can estimate wind speed and turbulence levels over forested areas, at heights of interest for wind energy applications (inline-formula∼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.

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Sogachev, Andrey / Cavar, Dalibor / Kelly, Mark / et al: Numerical modelling of the wind over forests: roughness versus canopy drag. 2020. Copernicus Publications.

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