城市中心区圈核结构模式的空间增长过程研究——对南京中心区30年演替的定量分析

STUDY ON SPATIAL GROWTH PROCESS OF CIRCLE-CORE MODE AT URBAN CENTRAL AREA:QUANTITATIVE ANALYSIS ON THIRTY YEARS' SUCCESSION OF CENTRAL AREA OF NANJING

以南京新街口中心区1978年以来的空间发展历程为例,以多年累积的矢量化数据为基础,通过墨菲指数的定量计算得到各个时期中心区的空间范围,并以空间矩阵分析、用地扇区分析和圈层构成分析技术详细剖析中心区的总体增长特征、分形演替特征及圈层演替特征,进一步研究各阶段用地构成、功能结构、空间形态等的不同特点,总结出城市中心区空间形态演替的圈核结构规律,把特大城市的多核中心区结构划分为主核圈层、阴影圈层、亚核圈层、辅助圈层以及交通输配体系,并以此为基础揭示特大城市中心区圈核结构模式空间增长的基本特征。

Taking Nanjing Xinjiekou Central District＇s spatial growth process since 1978 as the case, and based on the vector data of many years, this paper calculates quantitatively the spatial scope of the area at each period with Murphy Index. Then spatial matrix analysis, land-use analysis and sector composition analysis are applied to make a detailed analysis on the general characteristics of the spatial growth, the fractal evolution and circular succession of the central area, so that different characteristics of land-use composition, functional structure and spatial morphology for different periods are further studied. And then the circle-core mode of city center＇s spatial structure is summed up. On this basis, the multi-core structure of mega-city＇s central area is divided into the main core, shadowed circle, sub-core circle, auxiliary circle and affiliated transportation system. At last, the article reveals the characteristics of the spatial growth process with circle-core mode at the central area of mega-cities.