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

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

*Corresponding author for this work

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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.
Original languageEnglish
JournalAdvances in Science and Research
Volume17
Pages (from-to)53-61
Number of pages9
ISSN1992-0628
Publication statusPublished - 2020
EventEMS Annual meeting 2019: European Conference for Applied Meteorology and Climatology - Lyngby, Copenhagen, Denmark
Duration: 9 Sep 201913 Sep 2019
https://www.ems2019.eu/

Conference

ConferenceEMS Annual meeting 2019: European Conference for Applied Meteorology and Climatology
LocationLyngby
CountryDenmark
CityCopenhagen
Period09/09/201913/09/2019
Internet address

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