标题: Urban expansion and form changes across African cities with a global outlook: Spatiotemporal analysis of urban land densities
作者: Xu, G (Xu, Gang); Dong, T (Dong, Ting); Cobbinah, PB (Cobbinah, Patrick Brandful); Jiao, LM (Jiao, Limin); Sumari, NS (Sumari, Neema S.); Chai, BH (Chai, Baohui); Liu, YL (Liu, Yaolin)
来源出版物: JOURNAL OF CLEANER PRODUCTION 卷: 224 页: 802-810 DOI: 10.1016/j.jclepro.2019.03.276 出版年: JUL 1 2019
摘要: Africa has been experiencing rapid urbanization, yet limited studies have systematically investigated urban growth dynamics across African cities. Using 25 cities as cases, we quantified urban growth and form changes in Africa via spatiotemporal analysis of urban land densities in concentric rings over three time points (1990, 2000, and 2014). The results show that African cities have rapidly grown both in population and built-up areas, which increased by about 4% and more than 5% per annum, respectively. Urban land density (defined as the proportion of the built-up area to the buildable area) in each concentric ring decreases from the city center to the urban periphery with diverse patterns among cities. Comparatively, small cities have a lower urban land density and a more dispersed urban form than medium-sized and large cities in Africa. The international comparisons between cities with over one million population in Africa, Asia (e.g., China and India), Europe, and North America (i.e., the United States) reveal that African cities have a relatively less compact urban form. Implications of these findings for the future of African cities are further proffered. (C) 2019 Elsevier Ltd. All rights reserved.
作者关键词: Urban expansion; Population growth; Urban land density; Urban form; Urban sustainability; Africa
地址: [Xu, Gang; Dong, Ting; Jiao, Limin; Liu, Yaolin] Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
[Cobbinah, Patrick Brandful] Kwame Nkrumah Univ Sci & Technol, Fac Built Environm, Dept Planning, Coll Art & Built Environm, Kumasi, Ghana.
[Cobbinah, Patrick Brandful] Charles Sturt Univ, Inst Land Water & Soc, Albury, NSW 2640, Australia.
[Sumari, Neema S.] Wuhan Univ, State Key Lab Informat Engn Surveying Mapping & R, Wuhan 430079, Hubei, Peoples R China.
[Sumari, Neema S.] Sokoine Univ Agr, Solomon Mahlangu Coll Sci & Educ, Dept Informat & Comp, POB 3038, Morogoro, Tanzania.
[Chai, Baohui] Peking Univ, Inst Remote Sensing & GIS, Sch Earth & Space Sci, Beijing 100871, Peoples R China.
通讯作者地址: Jiao, LM (通讯作者)，Wuhan Univ, Sch Resource & Environm Sci, Wuhan 430079, Hubei, Peoples R China.
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