| At present,China has built the world’s largest high speed railway network system,the rapid development of high speed rail provides a variety of options for passengers to travel,the diversification of passenger transport products will make the travel of passengers more convenient,while the accessibility of passenger transport nodes has been greatly enhanced.Accessibility can be seen as the ease of travel to a particular destination and is an important indicator of the convenience of transport.Since the concept of accessibility was introduced,scholars at home and abroad have conducted a large number of studies on the spatial effects of railway networks,but from a spatial perspective,most of them are focused on a certain road network node city or a specific railway line.Combined with the above problems,this paper conducts a route search for 30 provincial capitals and municipalities directly under the central government in the inland region,and conducts a study on the accessibility of passenger transport nodes based on the solved effective routes,combined with the cumulative opportunity variables and other accessibility methods to design indicators,and compares the accessibility changes of each network node before and after the opening of the high-speed railway,and makes a determination of the "winners" and "losers",the main research content of this paper is as follows.(1)The train timetable data was processed to analyse the characteristics of passenger travel behaviour and the factors influencing it,and a passenger travel service network was constructed,which takes into account both direct and transfer modes of travel and analyses the situation of passengers changing at the same station and at different stations;the journey to the station and the journey from the terminal to the destination were also included in the study.(2)Through the analysis of passenger travel behaviour,the composition of travel generalised cost is analysed,which includes the value of travel time,comfort cost,interchange cost and fare factor,the generalised cost function is established,and the passenger travel path search algorithm is designed based on the idea of K short-circuit algorithm with the travel generalised cost as the threshold value and the condition that only one interchange of passengers is considered.At the same time,the effective path is defined according to the minimum generalized cost,and the effective path set for passenger travel is obtained.(3)Based on the effective paths of each passenger node and the generalised cost of passenger travel,the connectivity index and cumulative opportunity variables are used to design accessibility indicators,and the Beta Index,LBA and PBA are used to analyse the changes in the accessibility of passenger nodes,and to evaluate and analyse the connectivity of passenger nodes and the coverage of counties and populations respectively;the entropy weighting method is adopted to obtain the overall accessibility indicators of passenger nodes,while the indicators of passenger nodes are standardised to obtain the "relative" overall accessibility index,and to determine the "winners" and "losers" in the two periods before and after the opening of the high-speed rail.(4)30 provincial capitals and municipalities directly under the Central Government were selected as the research objects to analyze the accessibility changes before and after the opening of the high-speed railway;firstly,the effective paths of these 30 passenger nodes were searched to verify the validity of the path search algorithm,and the accessibility indexes were solved based on the obtained effective path sets as factors combined with the broad cost of passenger travel,travel time and mileage as thresholds,and the overall accessibility indexes were obtained through the entropy weighting method and standardized to compare the two periods before and after the opening of the high-speed railway;the accessibility evaluation and analysis of the 30 passenger nodes were conducted. |
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