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Releases of harmful gaseous materials within the lower part of the atmospheric boundary layer are of high concern of the society in general. The understanding of short-range dispersion of air-borne su...bstances within the urban canopy is crucial to predict spread of such pollutants. Mathematical modelling has to deal with many approximations or/and computer capacity limitations while solving such a complex task. Physical modelling is an alternative method that was used for investigation of the dispersion of a passive pollutant. The idealised urban canopies were created by regular cubes which were collocated at three different packing densities and two different patterns. The flow and concentration of the passive tracer released from the ground level source were measured simultaneously. Various single- as well as cross-statistics was derived. The terms describing purely advective and turbulent transport of the passive contaminant were measured by using a unique method. The comparison of those fluxes within 6 different arrangements of idealised urban canopies is shown and the importance of a proper determination of the turbulent fluxes at the edge of the plume and above the roof top level is emphasised.続きを見る
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