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以港口货物吞吐量和港口集装箱吞吐量为指标,运用首位度、位序-规模法则和Kernel密度估计对长三角地区港口规模分布进行研究。结果表明:(1)长三角地区港口等级规模分布由首位分布向位序-规模分布演变;港口货物运输与集装箱运输的首位分布特征演变具有内在一致性,但演变态势、具体时点等方面存在差异;港口体系结构由单核枢纽演变为双核枢纽,并有望形成三足鼎立新格局;(2)长三角地区港口规模分布逐步优化,等级结构不断趋于合理,港口体系基本满足位序-规模法则,但还没有达到理想状态;港口体系呈现分散化发展态势,集装箱技术的应用减缓了港口体系的分散化发展;(3)港口货物吞吐量与港口集装箱吞吐量的核密度曲线由多峰结构分别变为双峰结构和单峰结构,货物运输和集装箱运输均向协调态势发展。
Taking the port cargo throughput and the port container throughput as indexes, this paper studies the distribution of ports in the Yangtze River Delta by using the first degree, the order-size rule and Kernel density estimation. The results show that: (1) The distribution of the port scale in the Yangtze River Delta region changes from the first distribution to the distribution of the order-size distribution. The evolution of the first distribution of the port cargo transportation and container transportation is inherently consistent, but the evolution trend, specific time points and so on (2) The distribution of ports in the Yangtze River Delta region is gradually optimized and the hierarchical structure tends to be reasonable. The port system basically meets the order-size rule, But the port system has not yet reached the ideal state. The port system presents a decentralized development trend. The application of container technology slows down the decentralization of the port system. (3) The nuclear density curve of port cargo throughput and port container throughput changes from multi-peak structure For the bimodal structure and the single peak structure, both the freight transport and the container transport are coordinated development.