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Conference paper
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apo-nid178356.doc 1.14 MB

This paper discussed urban specific wind patterns and their influence on urban liveability in Adelaide CBD. Comfortable wind speed may vary between 1m/s and 5m/s (maximum 3-seconds higher gust in 80% of the time). However, the effect of wind speed on outdoor thermal comfort may vary significantly in different seasonal climates. During a sunny winter day, open spaces with less air turbulence can become places for public life; Higher wind speed may be preferred in hot summer days (to carry away heat stress). Buildings’ structures contribute to general wind blockage in urban settings while cause excess wind speeds around tall buildings (downwash flow) and narrow street canyons (horizontally accelerated flow). Discussing causes and effects of urban specific wind patterns, the influence of wind speed on outdoor thermal comfort is analysed. Results of outdoor thermal comfort modeling indicate that the wind speed of 5m/s can make the thermal environment of Adelaide CBD feels 6.7°C cooler in winter and 5.2°C cooler in summer. Thus, wind conditioning and speed control are essential components of climate sensitive urban design. Possible urban wind comfort design guidelines are presented and discussed for application in Australian context. Urban development guidelines are to prescribe acceptable wind speed thresholds when infill developments are proposed in high-density urban settings to support comfortable public life in public spaces of Australian cities.

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