Distributed Vulnerability Assessment Of Urban Road Networks

Urban road network is the main carrier of modern urban transportation.If it encounted emergencies,there would be much influence on citizens.Vulnerability research helps government and all walks of life to better cope with the abnormal disturbance of the society.In the city road planning,public security,it has the vital significance.The research on the vulnerability of road network is essential for disaster prevention and post-disaster treatment,which is of great significance to urban traffic management.There are lots of researches on road networks.Aiming at the problems of inaccurate expression of state vulnerability and excessively long calculation time of structural vulnerability in existing road network vulnerability assessment methods,this paper proposes to use taxi trajectory data to characterize road network state vulnerability and combine structural vulnerability research methods to realize comprehensive assessment of urban road vulnerability.The efficiency of network topology analysis in structural vulnerability can be improved by utilizing the efficient computing power of modern distributed computing technology.Taking Wuxi city as a case,using roads information from open street map and taxi trajectory data,the vulnerability of city road network was revealed.The result shows that this method in roads network research can effectively reveal the level of vulnerability considering both static network structure and dynamic demands of traffic,which is of great significance to understanding the runtime pattern of road networks.The experiments show that the computing power of distributed network topology analysis is significantly better than that of a single computer while ensuring the accuracy,indicating that distributed computing can significantly reduce the time cost of topology analysis.