Urban Park Bus Accessibility Research Based On Social Network Centrality Model

Under the policy guidance of national public transport priority development,how to optimize the urban park layout and spatial relationship of the bus network,to improve the bus park accessibility,become the realistic subject faced by urban construction process.The social network centricity has been applied to the relationship between urban public transport and economic activity location,city security,urban green space accessibility,etc.Based on Multiple Centrality Analysis(MCA),the study mainly focuses on the static road network,so it is difficult to apply in the actual planning.The bus network is a flexible alternative,which can improve the location condition of the park and improve its accessibility by changing the bus station line.With dynamic bus network as the carrier,by constructing bus social network centricity model,from two aspects of accessibility and connectivity,providing an effective analysis method.First of all,the research on the basis of city park entrance space 100 m distan ce,could be divided into access points and connection points,the number of bus lines based on the same route to construct adjacency matrix,preliminarily established the bus network structure model.Secondly,from the aspects of accessibility and connectivity 2 extracted the bus network centricity model of the independent variable factor,which characterize the degree centrality,closeness centrality and betweeness centrality of three independent variable factor,quantitative reflects the condition of city parks in bus network;The clustering coefficient characterizing the connectivity is quantitatively the degree of connection between the bus connection point and the access point.Then,the centrality model of the bus network is constructed through the weight assignment of the independent variable factor,which quantifies the bus accessibility in urban parks.Finally,an empirical study on the current situation of the bus network and 26 completed parks in Harbin was carried out.Through the analysis of accessibility and connectivity of access points,the study area park is divided into four categories,and the specific improvement suggestions are put forward through the central index of the access points in the park.In addition,the empirical study finds that the bus accessibility of Harbin city park is higher.However,the park bus in different areas has a large difference in accessibility.The central area can have better bus access,but the connection degree is generally.The outer ring area park can be accessible,but the connection degree is better.The outer ring area of the main urban area is the main service blind area,and the imbalance between supply and demand is obvious.Research is based on social network centricity model will transit network layout is divided into high value area and empty area,the author puts forward the reasonable planning for bus centricity empty area transit stations and lines,for bus centricity high value area supplemented countermeasures of city parks.