Cassini growth of population between two metropolitan cities—A case study of Beijing-Tianjin region, China |
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| Authors: | Yueguang Zong Wei Yang Qiang Ma Song Xue |
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| Institution: | (1) School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210093, China |
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| Abstract: | The existing models of population distribution often focus on the region with a single city or even multiple centers, and
lack the detailed explorations of the common and special type of urbanization areas with two centers. Taking Beijing-Tianjin
region of China, which is a distinct dual-nuclei metropolitan area in the world, as an example and choosing Landsat-5 TM image
in 2005, population, etc. as the data, this paper devotes to comprehending and illustrating a model of Cassini growth of population
between the two metropolitan cities through the research of spatial population distribution pattern, aided with RS and GIS
techniques. Main technical processes include Kriging interpolation of the population data and character simulation of the
Cassini ovals. According to the calculation of a/b, a key characteristic index of Cassini growth model, the spatial structures of population distribution were given. When a/b<1, it is a curve with two separated loops with a population density more than 3000 persons/km2. When a/b=1, it is a lemniscate curve with a population density about 3000 persons/km2. When 1<a/b√2, it is a dog-bone shaped concave curve with a population density between 500–3000 persons/km2. When a/b=√2, it is an oblate curve with a population density about 500 persons/km2. When a/b>√2, there is an oval-shaped convex curve with a population density less than 500 persons/km2. The results show that owing to the combined action and influence of the regional dual-nuclei, the population distribution
of Beijing-Tianjin region is in accord with Cassini model significantly. There-fore, there is Cassini growth of population
between the two metropolitan cities in Beijing-Tianjin region. In addition, the process of Cassini growth has extraordinarily
instructive significance for judging the development stages of the dual-nuclei metropolitan areas.
Foundation item: Under the auspices of National High-Tech Research and Development Program of China (863 Program) (No. 2007AA12Z235),
National Natural Science Foundation of China (No. 40471058) |
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| Keywords: | metropolitan city dual-nuclei metropolitan area urban spatial growth Cassini growth model Beijing-Tianjin region China |
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