Influence of Building Areal Density and Roof Shape on the Wind Characteristics Above a Town |
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| Authors: | Stylianos Rafailidis |
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| Institution: | (1) Meteorologisches Institut, Universität Hamburg, Bundesstraße 55, D-20 146 Hamburg, Germany |
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| Abstract: | Flow characteristics in the lower part of theatmospheric boundary layer developing immediatelyabove building roofs have been studied by physicalmodelling under neutral stratification conditions. Thevertical profiles of velocity, turbulence intensityand Reynolds stress were measured in detail above amodel urban fetch consisting of parallel streetcanyons. Two different street densities and roofshapes were tested. It is found that the influence ofthe buildings on the oncoming wind remains confined towithin three overall building heights above ground.Furthermore, the effect on the wind at roof levelfrom the areal building density is relatively weak, butstrong from the roof shape. Thus, altering roof shapecan have a much more beneficial impact on urban airquality than increasing the spacing betweenbuildings. Moreover, these findings yield a novelmethodology for reliable prediction of urban airquality, by combining numerical mesoscale wind flowmodels with physical street canyon pollutiondispersion models. |
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| Keywords: | Atmospheric boundary layer Urban micrometeorology Street canyons Physical modelling |
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