Research On Accurate Identification And Vulnerability Assessment Of Urban Multi Public Transportation Corridors

Since the beginning of the 21 st century,with the rapid advancement of Urbanization and the rapid increase of car ownership in China,a large number of people have flooded into cities,resulting in increasingly diverse travel needs of residents and a sharp expansion of urban traffic scale.At the same time,the renewal of urban road network lags behind seriously,and the imbalance between supply and demand of urban traffic facilities becomes increasingly prominent.In the urban road network system,public transportation corridors carry the main traffic flow of the city with a small amount of road resources.Therefore,accurate identification and reasonable evaluation of urban public transportation corridors will provide key information services for scientific optimization of urban road network and efficient control of road traffic.In the current era of big data artificial intelligence,massive big data of multi-city public transportation trips and mature and available spatio-temporal data mining technologies will provide strong support for the study of urban public transportation corridors identification and evaluation.Therefore,based on the big data of multi-urban public transportation travel,this paper systematically studies the accurate identification and vulnerability assessment of urban public transportation corridors from the perspective of "hub point-corridor line-road network" step by step.The main research contents of this paper include:(1)Urban public transportation passenger flow aggregation and dispersion point extraction.Taking the public transportation travel flow of three core cities as the research object,and considering the spatial and temporal distribution characteristics of upper passenger volume and lower passenger volume,the paper realizes the automatic extraction of multicity public transportation passenger flow aggregation and dispersion point,which can reveal the complex spatial and temporal distribution situation of urban residents’ public transportation travel demand more effectively and comprehensively compared with the existing research.(2)Accurate identification of urban public transportation corridors.Most of the existing methods for identifying urban public transportation corridors ignore the spatial constraints of road network on traffic flow and the directional continuity of traffic flow.Therefore,an adaptive and fine identification method for urban public transportation corridors based on multi-directional optimal extension is proposed.The accuracy and reliability of urban public transit corridor identification by the proposed method are significantly enhanced by the integration of road traffic dependence and the importance of road section resources.(3)Vulnerability assessment of urban public transportation corridors.Is focused on the urban road network,based on the recognition of public transportation corridors,the static road network structure multidimensional describe indicators,fusion multi-type attack strategy,the introduction of road network traffic efficiency change dynamic indexes such as established a geared to the needs of urban public transportation corridors discriminant of vulnerability evaluation model,for the importance of the core section of urban road network evaluation to provide technical support.