Research On The Synergistic Cooling Effect And Influencing Factors Of Urban Blue-Green Space

With the advancement of global urbanization,a large number of human activities have led to global warming and local heat island effects,posing a serious threat to urban ecological environment security and residents ’ health.As the most basic part of the living environment ecosystem,urban blue-green space plays an important ecological role in improving local microclimate and alleviating urban heat island effect.However,the current research on the cooling effect of urban blue-green space mostly focuses on the cooling effect of single elements of water and green space,and the systematic research on the synergistic cooling effect of urban blue-green space is still limited.Therefore,analyzing the synergistic cooling effect and influencing factors of urban blue-green space is of great significance for enriching the theory of synergistic cooling of urban blue-green space and alleviating the urban heat island effect.Through the combing of relevant literature,this paper defines the related concepts and connotations of the synergistic cooling effect of urban blue-green space,analyzes the formation and mechanism of the synergistic cooling effect of water body and green space,expounds the relevant theoretical basis used in this paper,and summarizes the influencing factors of the synergistic cooling effect of urban blue-green space.According to the extraction principle of influencing factors,the influencing factors of cold island characteristics and cold island diffusion in urban blue-green space are determined from two aspects of blue-green space structure and overall relationship characteristics.On this basis,combined with the current situation of banded blue-green space in Zhengdong New District of Zhengzhou City,27 research samples were selected as the research objects according to the sampling principles set up.Using ENVI and Arc GIS software,the surface temperature inversion and buffer analysis were used to process and calculate the cold island intensity and synergistic cooling effect of each quadrat,and the variation characteristics of the synergistic cooling effect of urban blue-green space were analyzed.Through the field investigation of the basic situation of the blue-green space research samples in various cities,the influencing factors of each sample are calculated,and the correlation between the influencing factors and the synergistic effect evaluation index is analyzed by SPSS software to determine the significant factors affecting the synergistic cooling effect of urban blue-green space.Based on this,with the support of the enhanced regression tree model(BRT),the contribution degree and marginal effect threshold of the significant factors affecting the synergistic cooling effect of urban blue-green space are further analyzed.ENVI-met software was used to simulate and verify the effectiveness and practicality of the research results.Aiming at the cold island intensity and cold island diffusion of urban blue-green space,the planning and design strategy of enhancing the synergistic cooling effect of urban blue-green space is proposed from two aspects of the characteristics of blue-green space and the characteristics of spatial relationship.Based on the relevant research basis of the synergistic cooling effect of urban blue-green space,this paper takes the urban strip blue-green space as an example,summarizes and screens the influencing factors of the synergistic cooling effect,and uses the combination of qualitative and quantitative methods to analyze the relationship between the influencing factors and the synergistic cooling effect of urban blue-green space,and puts forward the optimization design strategy to enhance the synergistic cooling effect of urban blue-green space.It has certain theoretical significance and practical value for exerting the synergistic cooling effect of urban blue-green space,alleviating the urban heat island effect and building a livable living environment under the background of stock development.