Research On Robustness Of Urban Road Traffic Network

As an indispensable constituent element in the transportation system,urban traffic is the main way for transportation and circulation within and between cities,which changes promote the process of urban economic development.It serves as an important connecting link to connect trade and maintains the trade,transportation and importation and export business between cities.It is also a prerequisite for residents to travel normally.In recent years,with the saturation of population and the rapid development of cities,the traffic problems have not only affected people's routine travel and commercial and economic development,but also hindered the pace and pace of urban construction.The non-standardization of the road system makes the overall operation of the transport system more difficult.Based on the theory of complex networks,a multi-spatial scale network modeling method is proposed to establish a dual-network topology model.The comprehensive analysis of statistical characteristic parameters and complex features are accomplished.The concrete robustness analysis is carried on according to the changes of the multi-spatial scale network under certain attack strategies.Specific research work is as follows:(1)Dual topological models are established from the multi-spatial scale of road names,road sections and societies respectively taking Shenhe District of Shenyang City as the main research object.The statistical feature parameters such as the node degree distribution are calculated.After comparative analysis,the results show the more detailed the spatial expression,the more number of nodes in the topological network increases.(2)The complex characteristics of multi-spatial scale network are analyzed and researched.Based on the comprehensive analysis of the characteristic parameters of multi-spatial scale road networks and the random networks with same number of nodes and the cumulative curve,the conclusion is drawn that there are dual complex features at the road name scale,while the other spatial scales only have the characteristics of small world.Therefore,the multi-spatial scale road network can be robustly analyzed based on complex network theory.(3)Random attacks and deliberate attacks are determined as an attack strategy to simulate the damage caused by natural and human factors to the road system.The relative size of the largest connected subgraph is chosen to establish a robust evaluation system.Through simulations under two kinds of attack strategies,the road network under the name of the road name shows obvious bipolar difference under the two attack modes,which is the robustness of random attacks and the vulnerability of deliberate attacks.In the other two scales,the road network showed no obvious difference under the two attack modes.The proposed modeling method is further presented to apply to the overall road network in Shenyang.The research shows that the road network in Shenyang without scale has obvious difference in the way of random and deliberate attacks under road names scale.Finally,the optimization strategies of the internal structure of the road network are given to improve the road network's tolerance performance under road names scale.The complex network theory and multi-spatial scale modeling method are applied for the robustness research of the road system.The network characteristics of the road network are analyzed from many aspects.The proposed method can be applied to the large-scale road network and reliable data is provided for the road planning management.