长江三角洲都市连绵区城市体系的分形特征

分形研究是现代理论地理的重要内容之一，分形维数是刻画城市体系结构的有效参数。为定量分析长江三角洲都市连绵区城市体系的分形特征，通过计算豪斯道夫维数分析了长江三角洲城市体系规模分布的分形特征，通过计算关联维数和集聚维数，从城市要素的空间相关性和城市随机集聚的向心性两方面，分析了长江三角洲都市连绵区城市体系空间结构的分形特征。测算结果表明：（1）城市体系规模结构符合位序 规模分布类型，但首位城市的垄断性还很强，处于由首位型分布向序列型分布转变的过程之中，中间位序的城市数量偏少，城市之间呈竞争发展态势；（2）城市体系空间结构呈现出均匀分布的特征，城市的空间关联性强，空间相互作用强度大。在上述结论的基础上对长江三角洲都市连绵区城市体系的优化发展提出了建议.

URBAN SYSTEM FRACTAL CHARACTERISTIC OF THE YANGTZE DELTA INTERLOCKING METROPOLITAN AREAS

The Yangtze Delta Interlocking Metropolitan Areas is one of the largest city regions in the world, and the structure of its urban system has had a great change in recent years. Fractal study is one of the most important content in modern theoretic geography,and the urban system fractal study is a new way for the study of the city geography especially, fractal dimension is an effective parameter describing the structure of the urban system. This paper commenced with the application of the urban system fractal theory and tried to find the rule of the urban system of the Yangtze Delta Interlocking Metropolitan Areas. Based on the fractal theory,the paper analyzed the scale structure and spatial structure of urban system, and found out that the urban system has the fractal properties,so the fractal theory could fit to calculate and analyze the scale structure and spatial structure of urban system of the Yangtze Delta Interlocking Metropolitan Areas. According to the results of calculation and analysis, the paper drew the conclusions below: (1) Scale structure of urban system of the Yangtze Delta Interlocking Metropolitan Areas presents rank-scale properties, the monopolies of primacy city are evidence, the quantities of middle scale city are less than bigger and smaller one, the development between different cities become more competitive than ever. (2) Spatial structure of urban system of the Yangtze Delta Interlocking Metropolitan Areas has fractal characteristic,the state of urban distribution is in equilibrium,the degree of interspaces conjunction between the cities is adequate compactness, and the intensity of the interactions of the cities is strong. According to the conclusions mentioned above,the paper presents that the effective measures must be taken to improve the situation of the urban system structure of the Yangtze Delta Interlocking Metropolitan Areas.