Research On The Method Of Bus Transit Network Adjustment In The Initial Network Of Urban Rail Transit

Metro lines tend to lay on the corridors of urban passenger flow at the initial stage of network,which have competition and cooperation relationship with bus.In this stage,the transfer demand of metro increases significantly,and the scale effect of metro network come to surface gradually.Because passenger flow move from bus to metro,bus network has to change its function and optimize the its layout based on the network of metro.It is of great significance to study the optimization method of network of bus in these stage for strengthening the integration of the two networks,and also improve the sustainable development ability of transportation.The variation rules of passenger strength,ridership in section,transfer coefficient,average distance carried at network level and at line level are studied.The variation of passenger volume,the proportion of transfer and internal transfer coefficient of bus are analyzed.By mining the smart card data,the threshold of recognizing transfer,distribution of transfer time and the spatial distribution of transfer are analyzed.The factors that influence the adjustment of network of bus are analyzed from three aspects: the development features of cities,the demand of residents for public transport,the function and layout of the initial metro network.Combined with the existing problems of bus network,the strategies of adjusting bus network are put forward from three aspects: adjustment of function and layout of bus network,optimization of connection between network of metro and bus,and adjustment and increase of bus line.The method of hierarchical division for bus network and station is studied.The relationship between the networks of metro and bus is analyzed from three aspects: spatial relationship,competition and cooperation relationship and symbiotic development relationship.The width of metro corridor is analyzed considering the walking distance from origin to station and the add-value effect of land.With the main purpose of adjusting the bus lines on the metro corridor,the factors that influence the route adjustment were selected from the geometric side,demand side,supply side and colinear side of bus lines.After reducing dimensionality by principal component analysis,the k-means clustering method is used to classify the lines.The statistical features of lines belong to different group are analyzed,then the adjustment measures,sequence of adjustment are studied based on the function of line.