Urbanization, land use transformation and spatio-environmental impacts: Analyses of trends and implications in major metropolitan regions of Ghana

被引:120
作者
Asabere, Stephen Boahen [1 ]
Acheampong, Ransford A. [2 ]
Ashiagbor, George [3 ]
Beckers, Sandra Carola [1 ]
Keck, Markus [4 ]
Erasmi, Stefan [5 ]
Schanze, Jochen [6 ,7 ]
Sauer, Daniela [1 ]
机构
[1] Univ Goettingen, Inst Geog, Dept Phys Geog, Gottingen, Germany
[2] Univ Manchester, Manchester Urban Inst, Dept Planning & Environm Management, Manchester, Lancs, England
[3] Kwame Nkrumah Univ Sci & Technol, Fac Renewable Nat Resources, Dept Wildlife & Range Management, Kumasi, Ghana
[4] Univ Bonn, Dept Geog, Bonn, Germany
[5] Univ Goettingen, Inst Geog, Dept Cartog & Remote Sensing, Gottingen, Germany
[6] Tech Univ Dresden, Fac Environm Sci, Chair Environm Dev & Risk Management, Dresden, Germany
[7] Leibniz Inst Ecol Urban & Reg Dev, Dresden, Germany
关键词
Urbanization; Metropolitan regions; City-regions; Spatio-environmental impacts; Land use transformation; Sustainability; Ghana; INFORMAL URBANISM; KUMASI; ACCRA; STATE;
D O I
10.1016/j.landusepol.2020.104707
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Urbanization induces spatial and environmental changes. Monitoring and understanding the nature of these changes is crucial to achieving sustainable urban development imperatives. To this end, this paper examines the evolution and spatio-environmental impacts of rapid urbanization in two major metropolitan regions of Ghana-Accra-City Region and the Greater Kumasi Sub-Region. The analysis uses Landsat satellite data and landscape metrics to examine land use transitions and to characterize the emergent landscapes over the last three decades. The results show that built-up land has increased significantly in these metropolitan regions largely at the expense of environmental land cover classes. The expansion process follows a general trend where the historical-core zones were initially sites of rapid land cover conversion to built-up, with settlements in the suburban and peripheral zones expanding in recent years and becoming integrated into the conterminous urban areas of the metropolitan regions. The analysis also uncovered a unique, dynamic and complex process whereby the urban-open-space class, being in a permanent state of flux, mediates transitions between built-up land and vegetation and vice versa. The metric-based land use transformation analysis shows that the landscape of the metropolitan regions has fragmented because of an increased expansion and aggregation of patches of built-up land in the core areas and leapfrog, sprawling expansion in the outlying suburban and peripheral zones. The paper concludes on the need for integrative urban growth management strategies that brings together spatial planning and environmental resource governance to avert the negative consequences on the natural environment of unfettered urban expansion.
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页数:14
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