Evolution Model And Characteristic Analysis Of Urban Road Network

Urban road network is the basis and artery of urban development.A road network with reasonable layout,sufficient capacity and high traffic efficiency plays an important role in promoting the economic development of the city.With the continuous progress of urbanization in China,the number of motor vehicles and the travel demand of residents are increasing day by day.Most cities in China are facing traffic congestion,environmental pollution,parking difficulties and other problems.It is more and more important to build a reasonable road network.On the basis of summarizing the existing road network construction models,this paper proposes a specific road network construction model,analyzes the basic characteristics of the model through simulation,and compares with the relevant characteristics of the real road network,proving that the model has similar characteristics with the real road network.This paper mainly studies the following aspects: firstly,based on the graph theory and the knowledge of complex network,the paper studies the model construction of urban road network topology and road network structure,extracts the vector diagram of Hefei road network by using Arcgis geographic information processing platform,analyzes the geometric characteristics,complex characteristics and hierarchical structure of Hefei road network,and puts forward the influencing factors of urban road network The macro and micro elements of urbanization.Secondly,based on the Delaunay neighborhood graph and cost-benefit analysis,the paper constructs the urban road network model,and quantitatively proves that the expansion of urban road network can be divided into two continuous stages: growth and encryption.The benefit brought by the construction section is calculated by traffic allocation,and the growth and densification of the section are determined by the relationship between the cost and benefit of the construction section.The linear relationship between nodes and road sections,capacity distribution,node degree distribution and network efficiency of the model are simulated and verified.The research shows that the model has good consistency with the relevant characteristics of the real road network.Finally,the relevant rules of the model are modified to study the influence of different connection modes on the model,including the connection mode of neighbor nodes,revenue calculation mode and traffic loading mode.The network structure characteristics obtained under different rules are compared with the relevant characteristics of the model.The results show that the model can explain the network characteristics most accurately under the same conditions.The superiority of the model is verified again.