| Compared with the development mode of a single city,urban agglomeration can often become an important engine to promote regional economic development.In the region,the dominant resources in the urban agglomeration are integrated into a whole,the resources are more centralized,the speed of development is faster,and the prospect of the development of a single city is more.Under the background of China’s economy entering a new normal situation,the geographical position of Cheng-Yu urban agglomeration began to be highlighted,and began to become an important motive force for the economic development of the western region.Under the new situation,Cheng-Yu urban agglomeration is not only to be able to build the city group leading the western development and opening,but also to promote the development of the small and medium-sized cities and small cities in the western region.The coordinated development of cities and towns is based on Cheng-Yu urban agglomeration with a good transport infrastructure.The amsportation infrastructure affects the formation and development of the urban spatial pattern.The domestic and foreign cases and the experience of urban development show that good transportation infrastructure plays a very important role in promoting the development of the region.The transportation network constructed by transport infrastructure has become the embodiment of interaction strength in the urban agglomeration.The improvement and upgrading of the transportation network not only have an impact on the regional spatial efficiency of the central cities,but also promote mutual attraction and common development and progress among the small and middle-sized cities.The evaluation criterion of the transportation network development in a region is accessibility.By comparing the change of accessibility,the status and function of the cities and towns in the traffic network can be clearly defined.At the same time,the urban development potential and competitiveness are evaluated by the interaction of cities and towns,and the inner cities of the urban agglomeration can be known by comparing the changing trend of accessibility.The change of inter city accessibility provides theoretical reference and decision-making for further promoting or improving the inter city interaction.This paper selects the land traffic of Cheng-Yu urban agglomeration as the research object,and selects the spatial pattern and research of the land road traffic accessibility of Cheng-Yu urban agglomeration in 2005,2010 and 2015.The main body of this study includes four parts:First of all,the research based on the research on accessibility at domenstic and abroad and summary of relevant theories,combined with the time domain characteristics and research hotspots,to build the basic framework and content of this study.Secondly,on the basis of domestic research,this study selects Cheng-Yu urban agglomeration as the main body of research,and takes the highway,National Road,provincial road,county road and railway as the accessibility analysis index with the road traffic of the highway,the National Road,the provincial road,the county road and the railway.Through the analysis of the land road traffic network of Chengyu city group in 2005,2010 and 2015,it is found that the overall development trend of land road traffic in Cheng-Yu urban agglomeration is good.Through continuous improvement of traffic infrastructure,the internal traffic network of urban agglomeration is improved,and the regional expressway in Sichuan Basin is basically realized in county and county.But it also reveals that the quality of the traffic infrastructure in the Cheng-Yu urban agglomeration is not high,the construction of rural roads is lagging behind,the transportation capacity is tense,the effective supply is insufficient,the cooperation of various modes of transportation is poor and the comprehensive benefit is not high.Thirdly,the reachability analysis method based on grid is used to calculate the reachability time change through average reachability.The results show that the accessibility level of Cheng-Yu urban agglomeration is in good performance in 2015.The best area of accessibility is concentrated in the central city,extending outward from the central city and gradually decreasing the accessibility of the city.In two cities,the accessibility of cities depends on the route and direction of the road network.The closer the traffic axis is,the better the accessibility of the city is.The accessibility of the northern part of Sichuan is slightly better than that of the south,and the accessibility level of Chongqing is better than that of Chengdu,but the accessibility level of Northeast Chongqing is relatively low.In the past 2005-2015 years,the accessibility level of Cheng-Yu urban agglomeration was improved as a whole,18.52% in 10 years,and a certain improvement in regional accessibility,and the time needed to reach the edge of the urban agglomeration was reduced.There are some differences in the average accessibility improvement level between Sichuan and Chongqing,and the uneven development characteristics are obvious.The cities in Sichuan showed low improvement and slow speed.The districts and counties in Chongqing showed the characteristics of high improvement and fast speed.As the Urban Accessibility goes on,the overall level of accessibility improves significantly with the increase of accessibility.Compared with the adjacent cities,the accessibility of Urban Accessibility improves more significantly.Finally,by comparing the accessibility of the traffic facilities in Cheng-Yu urban agglomeration,the overall land traffic accessibility of Cheng-Yu urban agglomeration is on the rise with time,and the time needed to reach the adjacent areas is shortened year by year.The expressway,National Road and railway have a positive effect on the accessibility of Chengyu city group,and provincial road and county road are of great significance to enriching the traffic network within the urban agglomeration,strengthening the connection between cities and connecting the urban and rural traffic network system. |
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