“红三角”地区城镇体系结构分形研究

分形维数是刻画城镇体系结构的有效参数。将“红三角”地区分成韶关、郴州、赣州三个城镇体系，分别测算各个城镇体系的Hausdorff维数、空间关联维数及牛鸦维数比、随机集聚维数。测算结果表明:①赣州、郴州两市的中等位序城市较多，人口分布比较均衡，而韶关市城镇体系等级规模差异明显，人口分布差异程度较大，韶关市区人口规模大，具有较强的垄断性；②各城镇体系中的城镇有集中到某一地理线上的趋势，具有轴线特征，同时整个地区的交通网络比较完善，整体通达性好，但城镇体系空间关联程度不够紧密；③各城镇体系空间分布呈现集聚性特征。最后对“红三角”地区城镇体系建设提出了发展次级中心城镇、加强区域空间结构轴建设、适当调整行政区划和加快交通基础设施建设的建议。

A FRACTAL STUDY ON THE STRUCTURE OF URBAN SYSTEM IN HONGSANJIAO AREA

Fractal dimension is an effective parameter describing the structure of the urban system.The paper chose 36 cities in Hongsanjiao made of Ganzhou,Chenzhou and Shaoguan as samples to analyze size fractal dimension,correlation fractal dimension and random aggregation fractal dimension of the structure of urban system.Through analyzing fractal dimensions and individual fractal dimension coordinate,the paper draws the conclusions below:①The quantities of middle size city are more than bigger and smaller one,and the regional population distribution is a relative equilibrium;②The spatial structure of urban system shows axis characteristic and perfect relatively network of transportation,but the degree of spatial association between the cities is inadequately compact,and the intensity of the interaction of the cities is medium;③The cities gather around their central city in spatial arrangement.According to the conclusions mentioned above,some proposals are put forward for the optimization of urban system such as developing actively sub central cities,strengthening the construction of regional spatial structure axis,appropriately adjusting the administrative division and accelerating the construction of transportation infrastructure.