基于改进Converse断裂点模型和加权Voronoi图的区域城镇体系结构研究——以天水市为例

在对Converse断裂点模型进行改进的基础上,通过构建评价指标体系和计算城镇中心性强度,对天水市城镇体系等级结构进行了划分;通过运用加权Voronoi图,划分了城镇影响范围和城镇经济区。研究表明:1)天水市城镇体系等级分化非常明显,可按中心性值的大小分为3个等级,其中一级城镇主要为天水各县区政府所在地;2)基于加权Voronoi图的城镇经济区打破了行政区划界线,更符合区域"城镇-腹地"相互联系和作用的实际;3)城镇影响空间既受城镇综合实力和区位交通条件的影响,也与地形、资源分布以及历史文化等因素密切相关。在天水市东部和南部,城镇空间影响范围明显大于中部和北部地区。

Research on Structure of Urban System Based on the Model of Improved Converse Breaking Point and Weighted Voronoi Diagram:A Case Study of Tianshui

Based on the improved model of Converse breaking point , the hierarchical structure of urban sys-tem have been divided in this paper by building evaluation index system and calculating centricity strength of towns . In addition, the influence space of towns have also been divided through the methods of weighted Voronoi diagram . The results show that:1) The differentiation of urban system are very obvious and may divide into three grade in Tianshui, most of the towns of county government station belong to the first grade;2) Administrative division have been broke by the towns economic zone which based on the weighted Voronoi diagram , and more in line with the actual of interaction between towns and hinterland;3) Influence space of towns not only impacted by urban compre-hensive strength , location and traffic conditions , but also closely related to the terrain , resource distribution , histo-ry and culture .In southern and eastern of Tianshui , the influence scope of towns are significantly greater than cen-tral and northern region .