Numerical modelling of the wind over forests: roughness versus canopy drag
<p>Parameterizing the effect of vertically-distributed vegetation through an effective roughness (<span class="inline-formula"><i>z</i><sub>0,eff</sub></span>) – whereby momentum loss through a three-dimensional foliage volume is represented as mom...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2020-06-01
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| Series: | Advances in Science and Research |
| Online Access: | https://asr.copernicus.org/articles/17/53/2020/asr-17-53-2020.pdf |
| Summary: | <p>Parameterizing the effect of vertically-distributed vegetation
through an effective roughness (<span class="inline-formula"><i>z</i><sub>0,eff</sub></span>) – 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 <span class="inline-formula"><i>z</i><sub>0,eff</sub></span> can estimate wind speed and turbulence levels over
forested areas, at heights of interest for wind energy applications
(<span class="inline-formula">∼60</span> 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.</p> |
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| ISSN: | 1992-0628 1992-0636 |