Research On Cooperativity And Hub Nodes Of Urban Public Traffic Based On Complex Network

At present along with the developing of city economy, increasing of population and car ownership, urban traffic issue is becoming grave. The vigorous developing of the urban public traffic can provide an effective method to solve traffic problems, especially traffic congestion. Currently, due to the construction of urban rail network, it compensates regular public transportation to a certain extent. As the differences and limitations exit between the urban rail network and regular public transportation, urban public traffic can show higher cooperativity according to adjust different traffic modes on one hand, on the other hand, public transit hub should be adjusted on a comparative part, so the regular public transportation can give full play to its advantage with the backbone role of urban rail network.The thesis does the thorough research to the cooperativity and Hub nodes of urban public traffic based on complex network. According to optimizing cooperativity, recognizing the public transit hub, enhancing robustness of urban public traffic and how to improve the overall service level and transportation efficiency of urban public traffic, the main work can be researched as follows:Firstly, the thesis systematically introduces the complex network theory and the urban public traffic system, and then it researches the cooperativity of urban public traffic network and classification of urban public traffic hub at the same time. Also, the thesis redefines the cooperativity, analyzes and summarizes the research methods of urban public traffic hub based on complex network.Secondly, combining with the Space L method, Space P method and complex network theory, the thesis researches the static characteristics and reliability of Lanzhou public transit network based on the analyzing the topological structure of urban public transit site network and transfer network. And then the thesis constructs the composite site network and the composite transfer network which consist of urban rail network and regular public transportation according to certain loading mechanism, and also the cooperativity of composite network is studied from static characteristics and reliability. According to certain strategy, optimization of cooperativity for composite network is also been researched. Taking Lanzhou public transit network and composite network as an example, the research result shows that the composite network reflects higher accessibility, higher load of passenger flow and higher reliability. Then by a certain optimization method, the Lanzhou composite network topology is more cooperative than before.Finally, the thesis selects different characteristic parameters to identify and evaluate the key Hub nodes based on complex network theory and grey relational analysis method, the result shows that the method is effective according to analyzing the Lanzhou public transit site network. Then combining with the complex network theory and attractiveness method, the thesis introduces the concept of Hub nodes to the location problem of the transit hub, and also analyzes the hub location problem of Lanzhou public transit network. The research results of thesis can provide referenced suggestion for rational planning and orderly development of urban public traffic.