Urban Multimodal Bus Network Optimization Based On Accessibility

With the expansion of urban scale,the planning and development of urban public transportation faces new challenges and tasks.The traditional traffic development planning aiming at motorization can no longer meet the needs of urban development.The access-oriented planning idea is more suitable to solve the dilemma faced by modern urban transportation development.Recent years,the development of urban public transport networks has been characterized by diversification and structural hierarchy.The planning and construction of multi-modal public transport networks has become an effective way to improve the accessibility of urban public transport.In order to promote the development of urban public transport,this paper studies the optimization of urban multi-modal public transport network based on accessibility.Firstly,this paper analyzes the structural characteristics of the network based on the composition of the multi-mode public transport network.Based on the characteristics of the multi-mode public transport network,the concept of multi-mode public transport network accessibility is proposed and its main characteristics and influencing factors are analyzed.Based on the classical accessibility model,this paper combines the utility maximization theory to construct a reachability measurement combination model with the utility model as the main body and the spatial interaction model.Combined with the characteristics of residents’ travel and the travel chain under the multi-mode public transport network,the combined model variable indicators and calculation methods are proposed.Combined with the urban multi-mode public transport network data source,the reachability measurement and combination model is used to calculate the reachability level of each area in the network.Realize the verification and application of the rationality of the combined model.In order to improve the accessibility level of multi-mode public transport network,this paper proposes stratified optimization of the network.The multi-mode bus station is graded by the measurement result of the reachability,and the line network is layered according to the site level.Combining the operational characteristics and the connection relationship of each level of the network,aiming at improving the accessibility,the optimization goal of the trunk network is to reduce the travel impedance.The optimization goal of the feeder network is toincrease the coverage of the network to improve the attractiveness of the multi-mode bus network.And study the relevant constraints for the optimization model of each layer network.Finally,combined with the principle of ant colony algorithm,the algorithm is improved according to the characteristics of network optimization and the network layout is implemented.With the help of MATLAB software programming,combined with case analysis,the optimization model and algorithm are applied,and the results are analyzed for reachability,which proves the rationality and practicability of multi-mode line network optimization based on accessibility.The multi-mode public transport network layered optimization method proposed in this paper not only simplifies the multi-objective problem such as network optimization,but also provides a new direction for the development of public transport network,which has certain theoretical and practical significance.