基于交通流数据的城市群空间结构特征分析方法

Spatial Structure Characteristic Analytical Approach to Urban Agglomeration Based on Traffic Flow Data

为探究区域协调互动机制,指导城市群空间规划以形成合理的区域发展格局,需开展城市群空间结构特征研究。根据地理学第一、第二定律和比较优势理论提出了一种迭代算法:采集城市群内部交通流OD数据,通过判断城市间交通出行的相似性,识别相邻城市在出行特征方面的一致性,构建区域组集合,分析城市群空间结构特征。以珠三角城市群为例,研究区域组间交互模式和交通供需关系。结果显示:珠三角区域组空间聚集特征显著,流向明确;存在6对区域组交互作用显著,经济互补性较强;肇庆市、珠海市、深圳市有4组区域组经济较活跃,与其他区域组交流频繁;广州至佛山区域组流量强度最大,要素供需旺盛。以上结果说明区域组流量强度与区域组中核心城区经济发展质量呈强正相关的基本规律仍有效,能分析出由区县构成的区域组间的交互模式、经济活跃度、与其他区域组的生产要素供给关系等关键信息,可为城市群空间决策提供理论依据。

In order to grasp the mechanism of regional coordination and interaction,and guide the spatial planning of urban agglomeration to form a reasonable regional development pattern,this paper carried out a study on the spatial structure characteristics of urban agglomeration.According to the first and second laws of geography and comparative advantage theory,the paper proposed an iterative algorithm:collecting OD data of traffic flow in urban agglomeration,identifying the consistency of neighboring cities in terms of travel characteristics by determining the similarity of travel patterns between cities,and building regional group sets to analyze the spatial structure characteristics of urban agglomeration.Taking the Pearl River Delta urban agglomeration as an example,the paper studied the interaction patterns between re-gional groups and the relationship between traffic supply and demand.The results showed that:the spatial aggregation characteristics of the Pearl River Delta regional group were obvious and the flow directions were clear;there were 6 pairs of regional groups had significant interaction and strong eco-nomic complementarity;there were 4 regional groups in Zhaoqing,Zhuhai and Shenzhen that were relatively active in economy and had frequent exchanges with other regional groups;the flow intensity of Guangzhou-Foshan regional group was the highest,and the factor supply and demand were quite strong.The above results show that the basic law of strong positive correlation between flow intensity of regional groups and economic development quality of core urban areas in regional groups is still valid,which can analyze the key information like interaction mode between regional groups com-posed of districts and counties,economic activity,and the supply relationship of production factors with other regional groups.It can provide theoretical basis for urban agglomeration spatial decision-making.