| As the core component of urban green infrastructure,park green space has become an indispensable public service product in the daily life of the masses.In recent years,with the elaboration of concepts such as park cities,national ecological garden cities,and digital cities,new requirements have been put forward for the planning and construction of urban parks.Parks not only need to include a variety of outdoor natural spaces and inclusive social places to meet the daily recreational needs of urban residents,but also use limited space and resources on the basis of intensive use of urban land to form a reasonable layout to form a structurally complete,functional park.A perfect park system is further coupled and compatible with the diversified green factors,blue and gray infrastructure in the region,so as to achieve the goals of adjusting the urban microclimate,reducing noise,air pollution,and maintaining biodiversity.As an important index to measure the construction of urban park green space,accessibility provides objective and effective data support for the construction of urban parks.Based on space syntax,topology,and synergy theories,combined with GIS network analysis,kernel density,spatial autocorrelation and other models and POI,land use,road traffic network and other data,this thesis takes the central urban area of Nanling County as the research scope to quantitatively analyze and evaluate the urban park green space from six dimensions: global accessibility,local accessibility,perceived accessibility,psychological accessibility,service accessibility and collaborative accessibility.The specific conclusions are as follows:(1)The overall and local accessibility of parks and green spaces in the central urban area of Nanling County is good,which can meet the daily recreational requirements of urban residents on an overall level.After the kernel density analysis,the road accessibility is characterized by the distribution of multi-core circles,and after superimposed analysis with the spatial layout data of urban parks,it is found that there are unbalanced layouts of parks in old and new urban areas,and imperfect road system construction around some parks..(2)The overall perceived accessibility of parks and green spaces in central urban areas is poor,which is not conducive to urban residents’ perception of park spatial information through local road networks.The overall space penetration capacity of the park is insufficient,and the psychological accessibility is average.(3)The index of park service accessibility increases with time cost.In the 15-minute living circle,the fairness of supply and demand in the construction of urban parks can basically be achieved.Although the park is small in scale,it bears 38.31% of the service pressure of Nanling County,which reflects the problem of insufficient number of parks and green spaces in the current construction process in urban areas.(4)The overall coordinated accessibility of the park is good,which helps to improve the overall ecological benefits of the city.The scope of ecological services of comprehensive parks and specialized parks can basically cover half of the ecological land within the research area.The collaborative accessibility index of community parks and amusement parks is low,and the connection with the ecological land in the neighborhood is insufficient.(5)After optimizing the spatial layout of urban roads and park green spaces based on the strategy of improving urban road structure,increasing park green space reasonably,enriching green open space,and building an urban park system,it is found that the overall,local,perception,psychological,service and collaborative accessibility of urban parks have been significantly improved,and the systematic and balanced distribution of park space has been improved. |
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