Research On Robustness Of Urban Transit Network

With the accelerated process of urbanization, the internal demand of urban mass transit construction is growing. At the present time, the number of planning lines in our country has been more than300, with a total mileage of12,000kilometers. Rail transit will enter a relatively complete network construction and operation stage. According to the increasing proportion of urban transit in the whole urban transportation system, it posed higher demand to the stability and adaptability of urban transit network when it meets an internal failure or an outside attack.The robustness of urban transit network is the ability of the system to provide alternative routes in case of an internal failure or an outside attack. Robust robustness of the system contributes to improve the reliability, the capability to respond to disaster and the quality level of service, giving full play to the siganificant advantages of urban rail transit.As a typical complex networks, urban transt network is also facing two kinds of attack:random failure and selective attack. At first, we try to build the topology map of urban rail transt, then collect its parameters and analyze its complex network characteristics on the base of complex network theory in the paper. Secondly, we establish an evaluation index system of robustness which is adequate for urban transit network from the perspective of complex network, including the connectivity, the relative size of the largest connected subgraph, the network efficiency and the ratio of turns. Finally, we analyze the robustness changes of Beijing2015urban transit network in a random failure or selective attack by calculating the value of each indicators in Visual Studio1010platform, using ArcGIS10.0to modify the topology map after each attack.