多中心城市区域城市蔓延冷热点格局演化研究--以苏锡常地区为例

In the process of rapid urbanization, accompanied by the rapid expansion of urban land use, urban sprawl becoming more and more serious. Due to the impact of inter-city, resource sharing, common competition, The urban sprawl evolution of polycentric urban region (PUR, Polycentric Urban Region) exhibit more complex. In this paper, SXC region as a case study, with the help of remote sensing images from 1991 to 2013 and Spread Characteristic Index , cold-hot spot spread area of SXC has been analysis . The results showed that: between 1991 and 2013, the pace of expansion of urban land in the study area far exceeds the rate of population growth, urban sprawl becoming seriously; SXC cold-hot areas of the city spread pattern experienced a "circle-style" - "distributed" - "multi-point connection chip" transformation process. Before 1995，all city balanced spread; Between 1995 to 2008, The spread pattern turning to scatter-fragmentation spread. To 2008，hot area filling spread between Center Cities. This study combined the measurement of the spread features, urban expansion index, with spatial analysis methods to help a deep understanding of the process of the study area's urban sprawl, Which can provide basis for decision making to control urban sprawl.