Influence Of Chengdu Chongqing High Speed Railway On The Spatial Structure Of Neijiang City Impact Study

Urban transportation has always been a key part of the city,and the change of transportation mode will continue to affect the development of the city and change the pattern of urban development.Under the background of rapid development of high-speed railway construction in China,high-speed railway and urban space interact more and more closely,and high-speed railway stations often become important engines for urban development.However,for the cities with high-speed railway stations at the edge of big cities,high-speed railway not only brings development opportunities to them,but also brings them great challenges such as resource outflow.Therefore,it is urgent,realistic and prospective to study the spatial impact of high-speed railway on cities with stations along the line.Under the initiative of chengdu-Chongqing twin-city economic circle strategy,the integration process of Chengdu-Chongqing region is more urgent.This paper takes Neijiang,the only turn-back city along the Chengdu-Chongqing high-speed railway,as the research object.Neijiang is located between chengdu-Chongqing two big cities.It is greatly influenced by the radiation of the two cities and has prominent geographical location.As a big city on the edge of Chengdu-Chongqing urban agglomeration,Neijiang occupies an important position in the development of Chengdu-Chongqing region.This paper selected Neijiang as the case study object,combined with the research results of high-speed rail and urban space,combined with gravity model,Arc GIS analysis,ENVI,historical POI data and other in-depth analysis and exploration,from the Chengdu-Chongqing high-speed railway along the three levels,the urban area of Neijiang,high-speed railway station area,analysis and study the impact of high-speed rail on the urban space of Neijiang.The analysis results are as follows:(1)At the regional level: in terms of accessibility,the change rates of accessibility of high-speed railway station cities are quite different,dazu > Chengdu > Longchang > Ziyang= Yongchuan > Neijiang > Zizhong = Rongchang > Jianyang > Bishan > Chongqing,and the change of accessibility of Neijiang is in the middle among ziyang and Jianyang.There is little difference between neijiang and neighboring cities of the same kind,showing a positive growth trend.In terms of the strength of economic ties,Neijiang’s development advantages continue to be highlighted after the high-speed railway is accelerated in 2020,showing strong economic ties with neighboring cities.(2)Urban level:(1)Comparing the changes of urban spatial form before and after the opening of high-speed rail,it is found that the opening of high-speed rail stimulates the expansion of urban space in Neijiang to the north,northwest and northeast of the main city.(2)Under the influence of urban planning policies and overall planning,the land use development of Neijiang shows a strong orientation,which promotes the formation of "high-speed railway New City".The development mode of multi-center structure evacuates the overcrowded old city functions to some extent,and contributes to the further optimization of urban spatial structure.(3)Improve the traffic system structure of Neijiang city,make neijiang North Station and Neijiang urban area more closely,improve the travel efficiency of passengers.(3)Station area level:(1)In terms of spatial development progress over the years,after the construction of high-speed railway hub,the space around the station area expands significantly and the expansion rate is fast.(2)Neijiang North Railway Station will form a residential oriented land development.Secondly,based on POI historical data,the change of land use function around the site is analyzed.The analysis shows that the economic function and traffic function increase significantly within 1 km of the site.However,the residential function is mainly distributed within 1 km around the site,and the construction change is not obvious.(3)An obvious circle structure is formed around the station area,and the four circles have great differences in leading functions.0-1000 m is the direct influence zone,and 1000m-2000 m is the indirect influence zone.Therefore,on the basis of summarizing the urban space problems of the Neijiang River,this study provides spatial optimization suggestions for the sustainable development of the Neijiang River in the future.