Study On The Change Of Spatial Pattern Of Economic Connection Between Urban Agglomerations Of Shandong Peninsula And Yangtze River Delta In The Background Of High-speed Railway

At present,academic research on the coordinated development of urban agglomerations is constantly carried out,and transportation as an important factor in the connection between urban agglomerations is often used as an entry point for research.The construction of important transportation facilities has the effect of “space-time compression” on spatial linkages between regions.Significant.The construction of the second section of the Beijing-Shanghai high-speed railway and the coastal railway(hereinafter referred to as the coastal railway)will further link the southeastern Shandong urban agglomeration with the Yangtze River Delta urban agglomeration,and bring opportunities for the Shandong Peninsula urban agglomeration to lead the province to realize the transformation of old and new kinetic energy.At the same time,it provides an opportunity for the Yangtze River Delta urban agglomeration to expand and expand northward.The second Beijing-Shanghai high-speed railway set a high speed,and the coastal railway broke the traffic habit of some high-speed rail in the coastal areas.The two major routes are of great significance and have received much attention.In this study,the two railways before and after the completion of the high-speed railway began to study the change of transportation time cost between the Shandong Peninsula urban agglomeration and the Yangtze River Delta urban agglomeration(hereinafter referred to as the two major urban agglomerations),from the prefecture-level cities to the individual and urban agglomerations.The economic accessibility and the strength of economic connection are measured from two perspectives.Based on the relevant theories of geography,the GIS technology method and geospatial processing are combined to analyze the Shandong Peninsula urban agglomeration and the Yangtze River Delta urban agglomeration economy before and after the completion of the high-speed railway.The spatial pattern change and impact of the connection has certain theoretical and practical significance.The thesis is divided into six chapters: Chapter 1 Introduction: From the perspective of “time-space compression” benefit and regional synergy development,the background analysis is carried out,and the relevant research progress at home and abroad is summarized and reviewed,and the socio-economic profile of the study area is analyzed.The research framework of the article was constructed,the research ideas and technical routes were designed,and the data sources and methods of the research were introduced.Chapter ? Theoretical Foundation and Model Construction: Firstly,the theory of geographic research including regional spatial structure theory,"central-periphery" theory,spatial neighbor effect and transportation economic belt theory is introduced.Secondly,combined with this study to construct a computational model for data analysis.The third chapter changes the time cost distance spatial pattern of the two major urban agglomerations before and after the completion of the high-speed railway: this chapter establishes the time-cost grid of the second Beijing-Shanghai high-speed railway and coastal railway construction by constructing a comprehensive transportation network database of the two major urban agglomerations.Using the data analysis function of ArcGIS 10.2,the most accurate cost distance analysis is carried out on a large number of raster data,and then the changes of the isochronous traffic circles of the two major urban groups before and after the completion of the high-speed railway are compared before and after the completion of the high-speed railway.The radiation range of the traffic circle is small.After the completion of the high-speed railway,the radiation range of the isochronous traffic circle of the two urban groups extends with the direction of the high-speed railway line,and the overall accumulated time is about doubled.The fourth chapter compares the differences in transportation economic relations between the two regions before and after the completion of the high-speed railway: through the comparative analysis of the accessibility of the two regions before and after the completion of the high-speed railway and the strength of economic linkages,under the joint influence of multiple factors,after the completion of the high-speed railway The economic accessibility and economic linkage between the Shandong Peninsula urban agglomeration and the Yangtze River Delta urban agglomeration have been significantly improved from the perspective of the overall and prefecture-level cities,but due to the level of economic development,economic center and peripheral relations,geographical attenuation and high-speed rail radiation.There are differences in factors such as the size of the scope,and the economic accessibility between the study areas and the increase in the intensity of economic linkages and the increase in the multiples in different perspectives.Chapter ? Conclusions and Prospects: The conclusions summarize the changes in accessibility and economic connection space brought about by the completion of the high-speed railway,and analyze the benefits and problems brought by the high-speed rail construction to the economic ties between the two regions.Looking forward to analyzing the shortcomings and limitations of the thesis writing,and exploring the shortcomings in the method and the key directions for improvement.