交通视角下关中平原城市群空间结构分形特征

Fractal characteristics of spatial structure of guanzhong plain urban agglomeration from the perspective of traffic

交通与城市空间结构有着密切的关系,二者协调一体化发展对城市群高质量发展有至关重要的作用。将关中平原城市群作为研究对象,旨在以分形理论视角研究城市群空间结构,以Hausdorff维数为依据,通过测算空间关联维数、牛鸦维数比、聚集维数等指标,充分考虑高速铁路、高速公路的影响,对比分析关中平原城市群及其周边四大城市群的空间结构特征及差异,力图为关中平原城市群高速铁路、高速公路与城市空间结构的协调一体化发展提供参考。结果表明:五大城市群各城市之间的空间分布都具有分形特征,但关中平原城市群城市间交通网络通达性和关联程度较高,且城市体系呈集聚态分布,从中心城市向四周呈现密度递减趋势。

There is a close relationship between transportation and urban spatial structure,and the coordinated and integrated development of the two plays a vital role in the high-quality development of urban agglomerations.This paper takes the Guanzhong Plain urban agglomeration as the research object,and aims to study the spatial structure of the urban agglomeration from the perspective of fractal theory.Based on the Hausdorff dimension,by measuring the spatial correlation dimension,the ratio of the cow and the crow dimension,the aggregation dimension and other indicators,it fully considers the impact of high-speed railways and highways,comparatively analyzes the spatial structure characteristics and differences of the Guanzhong Plain urban agglomeration and its surrounding four major urban agglomerations,and strives to coordinate and integrate the high-speed railway,expressway and urban spatial structure of the Guanzhong Plain urban agglomeration to provide reference suggestions for development.The result shows that the spatial distribution among the cities of the five major urban agglomerations all have fractal characteristics,but the accessibility and correlation of the transportation network between the cities of the Guanzhong Plain urban agglomeration are relatively high,and the urban system is distributed in agglomeration,showing a decreasing density from the central city to the surroundings trend.