Design And Research Of Blue-green Infrastructure To Slow Down The Heat Island Effect Of High-density Cities In China

The urban blue-green infrastructure can effectively alleviate the heat island effect.Therefore,it is necessary to understand the relationship between the blue-green infrastructure and the urban surface temperature,and its reasonable layout can effectively control the city surface temperature and alleviate the heat island effect.In this paper,the dynamic change pattern of land surface temperature and land use types in the central Chinese high density city of Wuhan in recent 20 years is analyzed,found that Wuhan's heat island range is expanding from the city center to the edge.According to the analysis of the relationship between land surface temperature and different land cover types,the land surface temperature of construction land and bare land is higher,while water,green land and farmland have obvious cooling ability,that blue-green infrastructure can cool the earth's surface.In order to analyze the factors affecting the mitigation of heat island effect by blue-green infrastructure,this paper studies the relationship between the distribution,this paper studies the relationship between the distribution,pattern and type of blue-green infrastructure and land surface temperature,increasing the area ratio and evenness of blue-green infrastructure can effectively play the cooling role of blue-green infrastructure;the higher the continuity of blue-green infrastructure,the smaller the patch area and the larger the core area,the bigger the area,the more complex the edge,the more abundant the composition and the more reasonable the density of the blue-green infrastructure,the stronger the cooling ability to the surrounding land surface temperature.In view of the distribution characteristics of Wuhan's blue-green infrastructure and heat islands,this paper puts forward at the macro level:constructing a balanced cold and heat flow space,building a complete blue-green ecological pattern,and giving full play to the maximum efficiency of blue-green types,this paper constructs the blue-green ecological pattern of Wuhan with "one axis encircling two rings,multi-corridors and multi-points",at the micro level,the local texture of the city is divided into three areas:cold island infiltration area,cold and hot flow area,and Hot Island Cooling area,and combined with the actual case,trying to use scientific planning and design means to create flexible blue-green infrastructure,to achieve urban cooling.