Characterizing the Evolution of the Container Traffic Share in the Mediterranean Sea Using Hierarchical Clustering
Characterizing the Evolution of the Container Traffic Share in the Mediterranean Sea Using Hierarchical Clustering
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DOI：
10.3390/jmse6040121
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发表时间：
2018-12-01
影响因子：
2.9
通讯作者：
Ortego, M. I.
中科院分区：
文献类型：
--
作者：
Grifoll, Manel;Karlis, Thanassis;Ortego, M. I.
本研究调查的交通份额的变化，集装箱吞吐量在地中海港口从2000年到2015年，考虑层次聚类和集中度指数。组成数据分析技术用于说明具有类似流量份额组成的时段。在地中海（Med）的两个不同的区域（东和西）被选择在长途服务的功能。标准浓度指数（即，浓度比、基尼系数和标准化赫芬达尔-赫希曼系数）显示，浓度略有下降，相关波动主要在东部地区。这是由于许多东地中海国家的私有化举措导致对该地区港口基础设施的投资。从层次聚类中得到的时期显示出交通份额组成的差异化模式。对于这些时期，转移份额的结果是一致的交通波动，并符合浓度指数的演变。这些方法的结合使得能够很好地解释地中海港口交通的时空演变，这是港口系统分析中适用于其他地方的方法。
This research investigates the traffic share evolution of the container throughput in the Mediterranean ports from 2000 to 2015 considering hierarchical clustering and concentration indexes. Compositional Data analysis techniques are used to illustrate periods with similar traffic share composition. Two different regions (East and West) in the Mediterranean Sea (Med) are selected in the function of the long haul services. The standard concentration indexes (i.e., concentration ratio, Gini coefficient, and Normalized Herfindahl-Hirschman) reveal a gentle decreasing of the concentration with relevant fluctuations mainly in the East region. This is due to the investment in port infrastructure in the area resulting from privatization initiatives in many Eastern Mediterranean countries. The periods obtained from the hierarchical clustering show a differentiated pattern in traffic share composition. For these periods, the shift-share results are consistent with traffic fluctuations and in line with the evolution of the concentration indexes. The combination of methods has allowed a good interpretation of the spatial and temporal evolution of the Med ports' traffic being the methodology applicable elsewhere in the context of port system analysis.