Study On The Optimization Strategy Of Microclimate In The Transitional Season Of Urban Micro-green Space In Xi'an

In recent years,with the acceleration of the process of social urbanization,resulting in the continuous expansion of urban construction land,the area of green space plummeted,the city's ecological environment quality and climatic conditions have gradually become harsh.As the main carrier of urban leisure activities,the ecological benefit and comprehensive function of urban micro-green space play an irreplaceable role in improving the outdoor microclimate environment and relieving the crisis brought about by urbanization.First of all,this article takes XI ' an micro-green space as the research object,from XI ' An's existing green space layout,takes the field investigation way,summarizes and selects four kinds of Xi ' an common micro-green space type as the sample,through the questionnaire and the behavior Annotation investigation,carries on the evaluation to the residents in the green space the microclimate heat comfort degree The correlation degree between the use preference of residents ' activities and microclimate was studied.Secondly,the field test and ENVI-met software simulation of four types of miniature green space were carried out in the transitional season,and the effects of green space components on the outdoor microclimate environment(thermal environment,wet environment and wind environment)and overall thermal comfort were analyzed and compared,and the control experiments were set up for the factors affecting the microclimate of micro-green space.,Quantitative analysis is carried out.Finally,according to the optimization demand of the residents for microclimate and the measured simulation results,the optimal design strategy of microclimate is put forward from two aspects of optimizing the location of green space(building and street layout,building orientation)and green space components(vegetation,paving,water body,structure),and the design theory is applied and verified in combination with practical cases.The following conclusions are obtained from the study of this paper:In terms of greenfield location: Combining different site conditions,it is suggested to choose three kinds of green space types,such as Traffic island type,single-sided enclosing type and two sides surrounding type B,in order to optimize the orientation of the building toward the southeast.In terms of the constituent elements of green space:(1)Plants can significantly improve the microclimate in micro-green space,and the improvement effect of composite planting structure is better than that of single vegetation planting structure.Plant green quantity and closed degree and air temperature also have a certain relationship,the larger the plant green,the higher the closed,the more obvious the cooling effect.(2)The specific heat capacity and color of the surface material have a certain influence on the microclimate,the lower the heat capacity and the darker the color of the material,the better the warming effect.(3)Water body has a good microclimate effect,the larger the water body area,the closer the distance water body to the micro-green space cooling and humidification effect is more obvious.