Research On Resilience Assessment And Governance Of Urban Transportation Infrastructure Network Under Multi-hazard Risk

The vigorous development and continuous improvement of service levels in urban transportation infrastructure have significantly enhanced the living environment and quality of life for city residents,and promoted the flow of economic,information and other elements.Nonetheless,the problem persists that the development of urban transportation infrastructure is uneven and insufficient,and multiple disasters frequently endanger the safety of people’s lives and property.The lack of safety resilience is a bottleneck that hinders the high-quality development of urban transportation infrastructure.Therefore,it is necessary to explore the classification of multi-hazard risks in urban transportation infrastructure,meaningfully evaluate transportation network resilience levels,and carry out essential research on resilience management,disaster prevention and mitigation strategies.This study takes urban transportation infrastructure networks as the research object,analyzes the resilience assessment methods and governance strategies under multi-hazard disturbances.Firstly,this study defines the types of multi-hazard in urban transportation infrastructure networks and analyzes their generation mechanisms.This paper reviews the current status of domestic and foreign research,summarizes the features and mechanisms of multi-hazard risks in urban transportation infrastructure,and proposes the following five common types of multihazard: concurrent heterogeneous multi-hazard,stacked homogenous multi-hazard,cumulative multi-hazard,cascading multi-hazard,and long-term/sudden multi-hazard.The paper analyzes the rainfall-flood cascading failure disaster chain under the cascading multi-hazard type,and carefully explains the developmental process and impact of rainfall-flood cascading multihazard,as well as its adverse impacts on the urban transportation infrastructure network.Secondly,this study establishes a resilience identification and measurement model of urban transportation infrastructure networks.With the Space L method,this paper constructs a model of urban transportation infrastructure network exemplified by the dual-layer complex network of regular bus-rail transportation and proposes a cascading failure model of the duallayer complex network of regular buses and rail transit based on the nonlinear load-capacity model.The study establishes the resilience evaluation method and systematic performance function of regular buses and rail transit networks from structural and functional dimensions.Combined with the resilience development process and actual case scenarios,the attack and recovery conditions are revised to improve the accuracy of traditional attack and recovery strategies.Finally,the study simulates the process of the regular bus and rail transit network in Xi’an suffering from the rainfall-flood cascading failure disaster and proposes corresponding and universal resilience improvement strategies.By taking the regular bus and rail transit network in Xi’an as an object,simulation scenarios and recovery strategies are established,simulating the resilience change process under the impact of multi-hazards such as rainfall-flood.Suggestions are made to enhance Xi’an’s transportation resilience,which includes three aspects of structural optimization design,passenger transportation function guarantee,and precise prevention and control.The effectiveness of the resilience measurement method and model are verified,and the strategies and methods for strengthening the resistance,reliability,and recovery of urban transportation infrastructure networks are supplemented.This research can provide decision-making references for the operation,management,and security departments of urban transportation infrastructure systems in disaster prevention and mitigation work.The study also tackles the adverse impacts of multi-hazard events on transportation infrastructure,thereby enhancing transportation safety resilience.