| Summary: | The synergetic development level of port and city is an important index to measure the radiation effect of the port. Through systematic analysis and study at the development level of port-city systems in the Chengdu-Chongqing Economic Circle, this paper constructed a synergistics-based synergy degree model and proposed an index system of synergy degree measurement for a port-city complex system based on a coupling coordination degree model. Results show that the ports and cities in the Chengdu-Chongqing Economic Circle are still far from high-level synergetic development. In general, the comprehensive synergetic development level of the ports and cities are rising, in which Chongqing ranks the top and is still in a rising trend. The comprehensive development level of Luzhou and Yibin is also on the rise, but the gap between them and Chongqing is becoming bigger. The synergetic development level of port and city is an important index to measure the radiation effect of port and constructs a synergistics-based synergy degree model for a complex system and proposed an indicator system of synergy degree measurement for a port-city complex system based on a coupling coordination degree model from the perspective of systematics.
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