| With the rapid development of urban construction,the degree of urbanization is getting higher and higher,but the public space for residents’ activities in the city cannot meet the needs of residents.The built-up areas with high density and high plot ratio in the city constantly change the nature of the underlying surface and the temperature rises,resulting in the "heat island effect" with obvious temperature difference between the city and the suburb.Dense buildings block the air flow,and the large amount of gases and particulate pollutants emitted by vehicles are difficult to diffuse and settle,impeding residents’ travel activities.Because of the aggravated problem of city,the destroyed microenvironment of city,the research on the microenvironment of city is becoming more and more important.In this paper,a combination of quantitative and qualitative methods is adopted to analyze and evaluate the comfort level of public space in blocks for residents’ daily activities,namely,Apple Orchard Park,Bajiao Cultural Square and Gucheng Park,which are closely related to residents’ life,from the perspective of wind and heat environment and air quality.The micro climate of the first of three public space environment such as wind speed,temperature,humidity,acquisition of PM2.5 and PM10,total radiation numerical respectively set up six points,everywhere analysis and comparison of the differences between the micro climate,and use the micro climate numerical simulation software ENVI-met status micro climate simulations,comfort evaluation to the whole area.It is found that the winter microclimate comfort of the public space in the three blocks is relatively low.This conclusion can also be verified by a comprehensive analysis of the comfort of the three regions.During the analysis of the evaluation results,it was found that different plant species would produce different shading effects,thus affecting the comfort level of the space.In winter,deciduous trees are more suitable for planting in the public space of Beijing,which can not only reduce the blocking of sunlight,but also block the flow of air.In addition,the underlying materials,spatial layout and supporting facilities also have different impacts on the microclimate.In the optimization strategy,respectively for space form,plant configuration,underlying surface materials,and service facilities optimization design was carried out on the four aspects,and to evaluate the optimized scheme,after comparing with status quo micro climate comfort level,found that the micro climate optimization strategy of this study is helpful to the promotion of comfort. |
