The Coupling-Coordination Relationship between Accessibility and Economic Linkage in Jing-Jin-Ji Metropolitan Area

The research about the coordinated relationship between transportation accessibility and economic linkage has important theoretical and practical significance. This paper uses the revised spatial interaction model to analyze the rail network accessibility and its spatial pattern and then explores the gravity model to calculate intensity of the economic linkage between the cities in Jing-Jin-Ji metropolitan area. Based on them, construct a coupling coordination model to evaluate the coordinated relationship between the accessibility and economic linkage in Jing-Jin-Ji metropolitan area. Results show that the spatial disparity of the coupling coordination degree between accessibility and economic linkage in Jing-Jin-Ji metropolitan area is extremely uneven, with a large difference in coupling degree, and poor accessibility and coupling degree of economic linkage in edge cities. The coupling coordination types of cities in Jing-Jin-Ji metropolitan area are different.