基于多源数据的广佛都市区城市引力结构特征分析

Characteristics of the Urban Gravity Structure in the Guangzhou-Foshan Metropolitan Area Based on Multi-Source Data

利用夜间灯光遥感数据和POI数据,采用断裂点分析法得出城市实体地域的范围大小。在此基础上引入交通便利系数和相对引力常量修正引力模型,分析广佛都市区内部各个城市实体地域间的引力强度和方向。结果表明:1)广佛都市区形成了以核心区为中心的“7+1”城镇体系结构;2)“七边形”正向城市体系结构围绕核心区域生成,“六边形”负向城市体系结构围绕西南区域生成,“西强东弱”格局明显;3)城市三角结构是广佛城市引力结构的基本单元,发展较好的城市组团为“核心区—顺德—南沙”“核心区—顺德—高明”“核心区—三水—花都”“核心区—花都—从化”,而“核心区—增城—南沙”和“核心区—高明—三水”组团则发展动能不足;4)广佛都市区引力势能大小及结构稳定与城市经济职能强度正相关。

As the endogenous driving force of regional development,the development of urban entities in metropolitan areas has a great influence on the development of the metropolitan areas,while the interactions between the urban entities'systems directly affect the metropolitan areas'development.Studying the relationship between urban entities in metropolitan areas and the basic development law of the structure between urban centers can provide some reference for the planning,development,and construction management of the urban centers and their surrounding areas in the metropolitan areas.Although the core entity territory of Guangzhou Foshan has been contiguous,its development connection with the peripheral urban territories remains the focus of research.In the context of the synergistic development of the Bay Area,exploring the characteristic relationships between the urban territories in the Bay Area hinterland can provide a positive response to the sustainable development of the Bay Area cities.This study constructs a POI&NPP composite index by a mathematical mean method to determine the POI&NPP composite value and the number of urban centers;Based on the feature that the integrated data will produce abrupt changes at the boundary,the city's boundary extent is then analyzed using the fracture point analysis method.We then analyze the strength and direction of the gravitational force between the urban entities within the Guangzhou-Foshan metropolitan area by adding the modified gravitational force model based on the divided urban-entity territory and the POI&NPP composite index within the scope.The results show the following:(1)A"7+1"urban system structure centered on the core area is formed in the Guangzhou-Foshan metropolitan area.(2)A"heptagonal"positive urban system structure is generated around the core area and a"hexagonal."(3)The urban triangle structure is the basic unit of the Guangzhou-Foshan urban gravitational structure,while the better-developed urban clusters are"Core-Shunde-Nansha,""Core-Shunde-Gaoming,""Core-Sanshui-Huadu,""Core-Huadu-Conghua,""Core-Zengcheng-Nansha,"and"Core."(4)The size and structural stability of the gravitational potential of the Guangzhou-Foshan metropolitan area are positively related to the intensity of the urban economic functions.