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Statistical modelling of pedestrian wind speed using high‐resolution digital surface models

Konferensbidrag (offentliggjort, men ej förlagsutgivet)
Författare Lars Johansson
Fredrik Lindberg
Shiho Onomura
Björn Holmer
Sofia Thorsson
Publicerad i The Eight International Conference on Urban Climates
Nummer/häfte abstract 183
Publiceringsår 2012
Publicerad vid Institutionen för geovetenskaper
Språk en
Ämnesord Digital Surface Models, Sky View Factor, Fetch, Frontal Area Index
Ämneskategorier Klimatforskning, Fysisk geografi, Meteorologi och atmosfärforskning

Sammanfattning

Spatial variations of near ground wind speed (2magl) within urban areas are simulated by using a statistical model. The model is built upon the statistical relationship between derivatives extracted from digital surface models characterizing urban geometries (sky view factor, fetch, frontal area index) and wind speed, using statistical regression techniques. The geometric parameters are calculated for a number of urban settings in Gothenburg, Sweden. Wind speed patterns are derived using the three-dimensional microclimate model, ENVI-met. The model closely estimate the wind speed within-the major parts of the model domains such as in squares, and narrow streets as well as canyons perpendicular to the incoming wind direction. However, the output wind speed patterns are largely different from the wind speed simulated by ENVI-met in wide streets and around buildings where wind speed is high. Statistical models, as presented here, would be useful for not only climatologist/ meteorologist but also urban designers to consider wind modes depending on urban geometries and also to estimate thermal comfort influenced by wind.

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