A NOVEL METHOD FOR EVALUATING THE PORT-CITY RELATIONSHIP FROM THE PERSPECTIVE OF EVOLUTIONARY ECONOMIC GEOGRAPHY: THE PIDI INDEX

LI Nan; CHANG Wen-Qian; HAN Guo-Yue

doi:10.13959/j.issn.1003-2398.2026.05.008

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HUMAN GEOGRAPHY ›› 2026, Vol. 41 ›› Issue (5) : 75-86. DOI: 10.13959/j.issn.1003-2398.2026.05.008

ECONOMY

A NOVEL METHOD FOR EVALUATING THE PORT-CITY RELATIONSHIP FROM THE PERSPECTIVE OF EVOLUTIONARY ECONOMIC GEOGRAPHY: THE PIDI INDEX

LI Nan¹, CHANG Wen-Qian², HAN Guo-Yue²

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Abstract

Unlike methods such as RCI and DCI that mainly evaluate the scale relationship between ports and cities, this research is based on the theory of evolutionary economic geography, taking the comparison between industrial diversity and port development levels as the key to evaluate the types and evolution of port-city relationships. After measuring the port development level and the industrial diversification level of port cities separately, this study uses functional data analysis as a computational tool and proposes a new method for evaluating port-city relationships, namely the Port-Industry Diversity Index (PIDI). Taking the port-city cluster in the Bohai Rim as a case study, this study calculates the changing characteristics of the PIDI matrix from 2003 to 2022. The research findings are as follows: 1) The PIDI designed by combining industrial diversity with port development level can evaluate the evolution of port cities more accurately, inferring the types of port-industry relationships and path dependence. 2) Compared with the original methods, the PIDI, emphasizing the core role of industrial development in transmitting port-city relationships, has advantages in a comprehensive indicator system and the use of functional data analysis. The empirical application in the Bohai Rim demonstrates that the PIDI can distinguish types of port-city relationships in different periods scientifically and comprehensively. 3) According to the PIDI calculations, there are four types of port-city relationships in the Bohai Rim: path-dependent positive interaction type, path-dependent portindustry mismatch type, path-breakthrough positive interaction type, and path-breakthrough port-industry mismatch type.

Key words

port city / industry diversity / EEG / PIDI / functional data

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LI Nan, CHANG Wen-Qian, HAN Guo-Yue. A NOVEL METHOD FOR EVALUATING THE PORT-CITY RELATIONSHIP FROM THE PERSPECTIVE OF EVOLUTIONARY ECONOMIC GEOGRAPHY: THE PIDI INDEX[J]. HUMAN GEOGRAPHY. 2026, 41(5): 75-86 https://doi.org/10.13959/j.issn.1003-2398.2026.05.008

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