Spatial Distribution of Population Density of Typical Megacities in Central China——A Case Study of Wuhan
利用GIS和SPSS分析武汉人口密度分布，发现核心-边缘结构和圈层分布，主城区呈复合多中心格局，人口密度模型随城市发展阶段变化。
To make up the deficiencies of the existing researches such as data averaging based on a single space type and weak petinency to cities rich in landscape resources, this paper uses GIS and SPSS to recognize the population distribution features in Wuhan, based on the multi- layer superposition of urban residential land, administrative areas of township, town and street, planning regional levels and grid units. The research discovers: on one hand, there is quite a big difference in population density gradient among administrative regions of township in the city, and thecore- edgeperipherystructure and the hierarchical circular distribution layout are obvious. On the other hand, the population in main urban areas is highly densed, with the distribution ofcomposite multi-centers. The intersection between Yangtze River and Han River performs as the population's main center, and in its 4km range the single center structure is prominent, which can be simulated accurately by power function model. There exist four population sub-centers beyond the scope of 4km, and three axis are formed by main center and sub- centers in northwest, northeast and southeast. The research shows that the spatial layout of population density in most Chinese megacities follows the rules ofcoreperiphery structure modelandcircular distribution. Inside the main urban area, there is always a high- density population center, and the spatial layout generally experiences a gradual transition frommonocentricstructure tocomposite monocentric- polycentricstructure. The density model changes with different megacities and stages of development.