Optimization Of Urban Spatial Form For Air Pollutant Diffusion

With the continuous development of Chinese socialism construction,socialism with Chinese characteristics has entered a new era.The comprehensive national strength has been continuously strengthened,the people ’s living standards have been constantly improving,and the process of urbanization has developed significantly,so the scale of China’ s cities has expanded rapidly.Under the background of high development in China,it is difficult to avoid producing various kinds of urban problems,among which a large number of air pollutants gathered in cities is one of the important urban problems,which seriously affects the production and living environment of urban residents.At present,inhalable particles have become the primary pollutant of urban air in China,especially the pulmonary PM2.5,,which is not only an environmental problem to ensure the healthy development of the city,but also a social problem affecting public safety.Urban spatial form has an obvious impact on the diffusion of urban air pollutants.As the focus of incremental urban construction in the future,its spatial form has an influence on the diffusion of urban air pollutants of more direct and practical significance.The response to urban planning for the diffusion of air pollutants is increasingly critical under the context of creating a livable urban living environment.This paper summarizes the urban spatial form response strategies and technical means of spreading atmospheric pollutants at home and abroad,and summarizes the research results from urban green space to gray space.Multi-source big data is studied based on grid partition method and correlation analysis and numerical simulation method.First,we explored the current characteristics of atmospheric pollutants in Hunnan New Area of Shenyang,understood the diffusion characteristics of PM2.5,analyzed the action mechanism of urban spatial form on PM2.5 diffusion,explored the key influencing factors of PM2.5 diffusion,and concluded that the urban ventilation capacity represented by surface ventilation potential coefficient is the key influencing factor of PM2.5 diffusion.Secondly,the urban ventilation capacity and the urban spatial morphological elements were quantified respectively,and through the coupling analysis,the key indicators of — urban roughness,average height,sky openness and windward area density to enhance the diffusion of air pollutants were further revealed.Finally,through the research conclusion and combining the previous research results,the urban spatial morphology optimization strategy is proposed based on the four indexes from the urban scale to the building scale,to strengthen the diffusion ability of PM2.5.The typical example area is selected to optimize the application and shows the application and feasibility.