Correlation Study Between Spatial Form Of Street Canyon And Pollutant Concentration Of Adjacent Blocks With Design Strategy Proposed

At present,urban environmental pollution is becoming more and more serious.At the same time as urbanization is progressing rapidly,how to alleviate the ecological and environmental problems through effective means and realize the development goal of Healthy China becomes crucial.The continued growth of car ownership and demand for driving have made traffic pollution one of the main sources of air pollution.The area of the street canyon in the city accounts for a relatively large area.The adjacent block next to the street canyon is used as a living and public activity area for people.The pollutants diffuse under the influence of the urban wind environment,and the adjacent blocks are the areas most affected by them.At present,little research has been conducted on the pollutant control in adjacent blocks.The improvement of the air environment in adjacent blocks should be the key issues for urban environmental research,which is of great practical significance for the implementation of current Healthy China policies.Combine the measured and numerical simulation methods to carry out relevant research: firstly,the diffusion mechanism of pollutants in adjacent blocks is analyzed by the measured methods,and the feasibility of the CFD numerical model is verified;then several non-isolated three-dimensional basic numerical models are established based on the outline of street canyon,the shape of single building on both sides and the height of the building group where the street canyon is located to study the relationship between the spatial form and the pollutant control ability of the adjacent block;from the perspective of exposure analysis,quantitatively compare the various working conditions,so as to determine which type of morphological indicators are more sensitive to exposure risk.It puts forward a range of morphological parameters that are conducive to the control of pollutants and the types of street canyons that are not recommended.Based on the conclusions obtained above,an application of morphological design to actual cases is demonstrated.So as to provide intuitive strategic guidance for the urban design,urban planning and architectural design processes to the control of pollutant.