Abstract
Based on the research progress in related fields and the distribution characteristics of road networks in valley cities, the complex network model of a city road network is established to study its connectivity reliability. Taking Lanzhou as the example, several parameters of the complex network abstracted from the road network are calculated and the practical meanings of them are described, respectively. On this basis, through computing the global efficiency and the relative size of the largest connecting subgraph under intentional attacks and random attacks, respectively, the curves of the above two parameters varying with the attacking times are drawn. The detailed investigation of connectivity reliability of Lanzhou road network is done by analyzing the curves’ tendency. Finally, we find that the network of a valley city has a poor connection and has a lot of dead ends. Besides, the average length of the roads is very long and the holistic connectivity reliability is at a lower level; these are suitable to the group‐type distribution of valley city’s road network, and the connectivity reliability of the road network is stronger under random attacks than that under intentional attacks.
Highlights
Since the reform and opening up of China, the urbanization process has been accelerated greatly, which requires the urban road system to meet the requirements of the rapid development of cities
A boom of the study has been set off on complex network structure and its dynamical behavior, and the discussion on complex networks has penetrated into biology, physics, economics, computer science, as well as traffic transportation and other areas, which has improved the scientific understanding about the real world 3–9
Through the analysis of the literature, we can see that the study of reliability of road network has transformed from the study only considering the physical structure of the road network to that of consideration of loading traffic flow and the mutual influence between travel demand and the capacity of road network, as well as the travel behavior of road users; the corresponding reliability indexes are connectivity reliability and travel time reliability
Summary
Since the reform and opening up of China, the urbanization process has been accelerated greatly, which requires the urban road system to meet the requirements of the rapid development of cities. Due to the limitations of historical and natural conditions, in many cities, especially the west valley cities, the phenomenon of urban road construction not meeting the requirements of urban development has appeared, which has brought inconveniences to the people’s production and life travel and has led to a series of social. As the transportation hub and logistic center in northwest China, is suffering from serious transport problems. Study on the reliability of urban road network will be able to provide theoretical supports for pertinently changing city traffic congestion
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