Study On Green Space System Planning Of Dangtu County Based On Urban Climate Characteristics

With the acceleration of urbanization in China,the urban area is expanding,the population is highly dense,and the urban climate problem is becoming more and more serious.Facing the urban climate problems brought by development,more scientific and reasonable urban green space system planning has become one of the important tasks of urban development.Urban green space system plays a significant role in improving urban environment,and urban climate has an important impact on the layout,system structure and development direction of urban green space system.In this paper,urban green space system planning based on urban climate characteristics is established as the main research direction.Based on the theoretical research of urban climatology,landscape ecology and green space system planning,a set of corresponding planning modes and methods are constructed.At the same time,through the way of case study,the basic resources of the green space system in Dangtu County were investigated and the current situation was analyzed,and the corresponding planning and construction strategies were put forward by using the "macro-meso-micro" planning method.This paper mainly includes four parts:(1)The first part mainly defines the concepts of urban green space system planning,urban climatology and urban heat island,and summarizes the current situation of urban green space system planning and the relationship between urban climate and green space at home and abroad.(2)The second part elaborates the planning direction of green space system based on urban climate characteristics and puts forward the planning requirements for its spatial structure and layout mode through the study of relevant theories.The procedure and content of urban green space system planning are discussed concretely,and a relatively systematic theoretical system of planning and design from three levels of "macro,meso and micro" is put forward.The macro-level planning is from the perspective of the overall layout planning of the green space system.The main contents of the meso-level include the establishment of relevant planning indicators,green space classification planning,ventilation corridor planning,biodiversity planning and so on.From the microcosmic point of view,it mainly carries out greening tree species planning and urban microclimate planning and design.(3)The third part studies the main characteristics of urban climate in Dangtu County:?the characteristics of temperature change:from 1963 to 2018,the annual average temperature of Dangtu County is 16.0 C,and the annual average temperature of Dangtu District shows an obvious upward trend,with an increase rate of 0.25?/10a.? Study on the spatial distribution of heat island:Using Landsat 8 TIRS data of Dangtu County to retrieve the surface temperature by ENVI5.3,the distribution map of surface heat field is obtained.The analysis shows that the heat island in Dangtu County's central urban area mainly distributes in the economic development zone and the old urban area,and the cold island mainly distributes along the rivers in the south of the city and the forest areas in the east of the city.? Characteristics of wind field in urban area:The main wind direction is Southeast wind,the average wind speed is 2.7 m/s,and the ventilation condition in urban area is better.?Air quality in Dangtu County:In 2018,air quality was significantly improved compared with that in 2014,and the excellent rate increased by 45.7%.The air environment in Dangtu County was significantly improved,thanks to the implementation of relevant environmental protection measures and the improvement of urban green space rate.(4)The fourth part is the urban green space system planning of Dangtu County:through the construction of the planning method system,the urban green space system planning of Dangtu County is certified,the actual situation of the urban green space in Dangtu County is comprehensively investigated and analyzed,the existing problems of the green space system in Dangtu County are summarized,and the green space system in Dangtu County is carried out according to the new classification standard of urban green space through corresponding procedures and methods.Scientific and rational planning.