The Study On The Relationship Between City Haze And High-rise Buildings In Shijiazhuang

High-rise building has gradually become the leading modern city architecture,and haze also began to appear frequently in modern urban life.Winter haze is particularly serious in the north.It brings great harm to people’s lives and work.The haze of Shijiazhuang situation is particularly prominent.Urban haze has certain relevance with high-rise buildings in the city.Reasonable layout of high-rise buildings has some practical significance to reduce haze pollution and improve the quality of atmospheric environment.Based on the study of the current situation of haze and high-rise buildings in Shijiazhuang,this paper selects the typical area to study the distribution of atmospheric pollutants and the vertical distribution of PM around the high-rise buildings.The CFD software is adopted.Based on the theory of atmospheric diffusion,the influence of different high-rise building layout on the atmospheric diffusion was simulated.The results show:The main urban high-rise buildings in Shijiazhuang are mainly 17-33 storey high-rise buildings,which have not yet formed obvious urban air ducts.This affect the diffusion of atmospheric pollutants.The TSP and PM10 concentrations around the high-rise buildings decrease with the increase of height in the range of 0-46 m.The PM2.5 and PM1 mass concentrations were not significantly different in the low altitude of 0-66 m,and the mass concentration of PM2.5 and PM1 increased significantly after 90 m.The influence of temperature,humidity,air pressure and wind speed on the concentration of PM2.5 in haze conditions were as follows: wind speed,pressure> humidity> temperature,wind speed and pressure had the greatest influence.Height,flow angle,and layout of high-rise buildings affect the flow field around the wind environment of high-rise buildings,thus affecting the diffusion of air pollutants in haze.CFD is used to simulate the high-rise buildings and different layouts of buildings.,And gives the layout pattern of haze diffusion under different environmental conditions,and puts forward preliminary layout strategy for high-rise buildings in Shijiazhuang.