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为了定量描述中国公路货运枢纽体系结构现状,将公路货运量作为货运枢纽的规模参数,推导了分维数的计算公式,选取1997~2007年的货运量统计数据,计算了200个公路货运枢纽规模分布的分维数。数据拟合发现:1997~1999年公路货运枢纽的规模分布具有双分形特征,2000~2007年的规模分布呈单分形结构,且分维数介于1.464 6~1.570 1间,公路货运枢纽体系的规模分布与城镇体系基本一致。分析结果表明:中国公路货运枢纽体系规模分布从双分形到单分形的演化显示其发育较好,需加强大型公路货运枢纽建设,以进一步优化公路货运枢纽体系结构。
In order to quantitatively describe the status quo of China’s road freight hub system and use the road freight volume as the scale parameter of the freight hub, the fractal dimension calculation formula is deduced. According to the freight volume statistics from 1997 to 2007, the total number of 200 road freight hubs Fractal dimension of distribution. According to the data fitting, the scale distribution of highway freight transport hubs has bifold characteristics from 1997 to 1999. The scale distribution from 2000 to 2007 was single fractal structure, and the fractal dimension ranged from 1.464 6 to 1.5701. The highway freight transportation hub system The size distribution is basically the same with the urban system. The analysis shows that the evolution of the scale distribution of China’s highway freight transportation hub system from bifurcation to single fractal shows that it has a good development. It is necessary to strengthen the construction of large-scale highway freight transport hub to further optimize the system structure of the highway freight transportation hub.