Analysis And Research On Spatial-temporal Evolution Of High-speed Railway Network Accessibility And Economic Linkage

Transportation is the country’s fundamental strategic industry and is closely related to the national economy and people’s livelihood.As the backbone of the transportation system,railways build a powerful transportation country and build a modern comprehensive transportation system that is "safe,convenient,efficient,green,and economic." This is the most important historical mission.The Yangtze River Delta region is the region with the most developed economy and the most complete high-speed railway network in China.The construction of high-speed railways has improved the economic strength and economic status of the region.It has studied the evolutionary relationship between the accessibility of high-speed railways in the Yangtze River Delta urban agglomeration and the temporal and spatial economic links The gradual construction of the densely integrated network of high-speed railways has evolved the temporal and spatial evolution of economic connections in the Yangtze River Delta urban agglomeration,which can provide a positive reference for the future planning of high-speed railways,how to plan the line direction,select the number of line stations and determine the location,etc.In the future,the country will vigorously construct high-speed railways in other regions to provide reference opinions.Through consulting materials and literature and field research,the characteristics of the high-speed railway and the economic development status of the Yangtze River Delta urban agglomeration are summarized.Based on the existing research,we determine the data and models needed for the research in this paper.An urban comprehensive quality evaluation index system was constructed,and the weights were obtained based on the entropy weighting method,and the calculation method of the city quality index was further obtained.On this basis,a city accessibility level model was established based on the weighted average travel time.Obtaining the accessibility of various cities is to analyze the accessibility of the high-speed railway network.The economic connection strength model and economic membership model are established,and the spatial autocorrelation analysis method is given,which can analyze the economic strength relationship and the spatial and temporal evolution between cities.The 19 cities with the most densely distributed high-speed railway networks in the Yangtze River Delta urban agglomeration were selected as the research objects,and the weighted average travel time and accessibility coefficients of each city from 2008 to 2018 were calculated.The economic strength relationship and autocorrelation between the cities were finally analyzed.The conclusions of the accessibility and economic connection of the high-speed railway network of the Yangtze River Delta urban agglomeration are obtained.The high-speed railway has shortened the transit time between cities.The accessibility of 19 cities in the past 11 years has shown an overall upward trend.With the gradual saturation of high-speed railways,the growth rate of urban weighted average travel time in 2008-2013 is greater than that in 2013-2018,and the growth trend is from rapid to moderate.The weighted average travel time of Shanghai,Suzhou,Wuxi and other cities is basically at the shortest time,but there is still much room for improvement in cities such as Hefei,Tongling,and Anqing.The level of urban accessibility is not only related to its own economic strength,but also to the economic radiation intensity of surrounding cities.Generally speaking,the lower the weighted average travel time,the higher the city ’s economic radiation intensity to the surrounding cities.At the same time,because the surrounding cities cannot provide the required economic gravity,their own economic level has not been significantly improved.