| The unreasonable urban expansion violates the needs of ecological protection and brings about more and more serious urban ecological problems.The microclimatic environment of urban residential area is the urban regional climate environment,which is closely related to people's daily life.The green space resilience of urban residential areas is also an important part of urban space resilience.Suitable planning and design of residential green space can improve the microclimate environment and strengthen the tenacity of residential space.The purpose of this paper is to sort out the theoretical research on micro.climate and green space in urban residential areas.Based on the field investigation and summary of the green space in Shanghai old community and Luoliu community,and combined with the software ENVI-met developed by German geographers,the micro.climate simulation and data analysis of green space in different layout forms in the research area are carried out.The purpose of this study is to explore the impact of green space on the micro.climate of the old residential area in Shanghai,analyze the characteristics of the micro.climate environment created by different green space layout forms and plant configuration structures,and propose the transformation strategy of improving the spatial toughness of green space in the old residential area by means of computer numerical simulation.Based on the investigation and summary of the old residential districts in Shanghai and Luoliu communities,the spatial layout and combination types of green space in the old residential districts in Shanghai and their influencing factors are summarized,and three types of spatial layout of green space in residential districts are obtained,namely,parallel type,building enclosure type and greening enclosure type.The measured and simulated results show that the temperature,humidity,wind speed,wind direction and other microclimatic factors vary in different spatial layout types and plant configuration structures of green space in Shanghai at the same time,and the spatial toughness also varies.The building enclosed green space is most affected by the shadows of buildings,and the green space is closed.Although the microclimate factors are stable,the green space is less resilient.The characteristics of parallel green space are that it has a certain mitigation function for the temperature rise,and because of its high ventilation,it can have a strong green space resilience after combining with reasonable plant allocation.Green space is also closed tosome extent.It is usually covered by greening plants.Although it can effectively slow down the solar radiation,it is too lush and lack of pruned trees,which will hinder the wind passage.Therefore,only by maintaining the plant maintenance and pruning of greening enclosure space can its spatial tenacity be effectively improved.In this paper,three types of green space measured in Luoliu community are modeled and simulated by ENVI-met.After comparing and analyzing the results with the measured data,the internal model of the model is adjusted,so as to put forward the adaptive transformation strategy of green space microclimate in the old community.The ventilation of green space should be considered firstly when the transformation of green space in old residential areas is carried out.Secondly,the canopy width and vertical structure of greening plants should be rationally matched in the transformation site.Thirdly,combined with the dominant wind direction of the site and the combined layout of residential groups,the space layout of public facilities and site walkways should be set up reasonably.Finally,the vertical green space design such as roof garden and water landscape design such as rainwater garden should be appropriately added to the site,which can not only help the site to effectively adjust the microclimate environment,but also improve the resilience of residential green space. |
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