Seasonal effectiveness of a Korean traditional deciduous windbreak in reducing wind speed
Little is known about how the increased porosity of a deciduous windbreak, which results from loss of leaves, influences wind speed reduction. We hypothesized that, with loss of foliage, the wind speed reduction effectiveness of a deciduous windbreak decreases on near leeward side but no...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
The Ecological Society of Korea
2014-06-01
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| Series: | Journal of Ecology and Environment |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.5141/ecoenv.2014.011 |
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| Summary: | Little is known about how the increased
porosity of a deciduous windbreak, which results from loss of leaves,
influences wind speed reduction. We hypothesized that, with loss of
foliage, the wind speed reduction effectiveness of a deciduous
windbreak decreases on near leeward side but not on further leeward
side and that wind speed recovers faster in the full foliage season
than in other seasons. During summer, autumn, and winter (full,
medium, and non- foliage season, respectively), we observed wind
speed and direction around a deciduous windbreak in a traditional
Korean village on windward and near and further leeward sides (at
–8H, 2H, and 6H; H = 20 m, a windbreak height). We used a linear
mixed effects model to determine that the relative wind speed
reduction at 2H significantly decreased from 83% to 48% ( F 2,111.97
= 73.6, P < 0.0001) with the loss of foliage. However, the
relative wind speed reduction at 6H significantly increased from 26%
to 43% ( F 2,98.54 = 18.5, P < 0.0001). Consequently, wind speed
recovery rate between 2H and 6H in summer was two times higher than
in autumn and ten times higher than in winter ( F 2,102.93 = 223.1, P
< 0.0001). These results indicate that deciduous windbreaks with
full foliage seem to induce large turbulence and increase wind speed
recovery rate on leeward side. Our study suggests that further
research is needed to find the optimal foliage density of a deciduous
windbreak for maximizing windbreak effectiveness regardless of
seasonal foliage changes. |
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| ISSN: | 2287-8327 2287-8327 |