Study On Qingdao Bus Network Model Based On Complex Network

With the development of China's economy and the acceleration of urbanization,the scale of cities is bigger and bigger,and the two element structure of urban and rural areas is being gradually broken.However,in the process of rapid expansion of urban scale,traffic problems are becoming more and more prominent.To solve the problems existing in urban traffic,the fundamental solution is to develop public transport.According to the statistics,in the case of the same trip,the road resources occupied by cars are seven times as high as that of the bus.By contrast,it can be found that the bus saves the road resources more and greatly improves the travel efficiency.At present,the sharing rate of bus travel in some large cities in China is still relatively low compared with the developed countries,and there is a certain gap,which shows that there is a great potential for the development of public transport in China.This paper uses complex network theory to study the public transport system in Qingdao.From the macro perspective,the whole Qingdao bus system is abstracted as a network,and all the lines and site data of Qingdao bus system are collected.265 bus lines are collected and 1788 sites are involved.On this basis,the complex network theory is used to construct Qingdao city.Bus site network model,bus line network model and bus transfer network model,respectively give three models of topology diagram,intuitively show the density of the three models.The three statistical characteristics of the above three kinds of Qingdao public transport network models are calculated:node degree and degree distribution,average path length and clustering coefficient.The network of bus stops in Qingdao is a typical scale-free network with small world characteristics.Qingdao bus line network is not scale free network,but it has small world characteristics.The public transport network in Qingdao has the characteristics of scale free network and obvious small world.Then,this paper studies the robustness of Qingdao bus network.It mainly attacks two networks in Qingdao city line network and Qingdao city site network.The attack mode uses two kinds of random attack and deliberate attack,and analyzes the change of network efficiency value when the two networks are subjected to attack.Finally,the paper gives the optimization plan of Qingdao public transport system.The route of Qingdao bus system will be changed into regular bus lines,which will improve the efficiency of the whole network.The bus routes should be divided into primary and secondary networks,and the whole network should be built around the trunk lines.At the same time,the complementarity between rail transit and subway should be considered.