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Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone
Jin, Wen1,2,3; Cui, Yifei4; Wu, Shengnan3,5; Cheng, Deqiang1,3
2020-04-01
Source PublicationURBAN ECOSYSTEMS
ISSN1083-8155
Pages12
Corresponding AuthorCui, Yifei(yifeicui@mail.tsinghua.edu.cn)
AbstractLand use changes associated with urbanization may increase ecological risk and subsequent geohazard risk. Africa is particularly vulnerable at preset as, since 2005, the highest rates of rapid urbanization-associated forest degradation have occurred there. On August 14, 2017, a compound geohazard in Freetown, Sierra Leone, caused thousands of fatalities and destroyed hundreds of houses. Land use change is considered the main factor contributing to geohazard initiation. Here, we use Freetown as a case study to quantitatively assess the magnitude of the increase in ecological risk associated with land use changes. To achieve the aim, satellite images are used in the case study area from 2007 to 2017, the data are integrated into a geographic information system. A series of indices are then used based on the processed images to describe land use and ecological risk, including dynamic index, trend and state index, and ecological risk index. The results show that Freetown experienced a rapid urbanization process, together with an unbalanced increase in urban land and complex conversion of bare and grass land, from 2007 to 2017. Significantly degenerated forest was converted into urban land (2.77%), bare land (6.47%), and grassland (10.27%), while the ecological risk level increased from low to high. The ecological risk in the affected area of geohazard is found higher than that of the surrounding mountainous area. It indicates that vegetation may reduce the risk of disaster. This result is helpful for the trade-off between urban development and ecological protection and rational urban planning. For disaster resilience and sustainable development of Freetown, and also other rapidly urbanizing cities in mountainous areas, ecological protection must be incorporated into development planning.
KeywordEcological risk Urban expansion Forest degeneration Trend analysis Mountain area Freetown
DOI10.1007/s11252-020-00989-1
WOS KeywordLAND-COVER CHANGE ; HURST EXPONENT ; LANDSCAPE ; RIVER ; SOIL ; INDEXES ; BASIN ; LANDSLIDES ; XINJIANG ; PLATEAU
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41941019] ; Major Program of National Natural Science Foundation of China[41790432] ; Key Research Program of Frontier Sciences, CAS[QYZDY-SSW-DQC006] ; Sichuan Science and Technology program[2019YFH0040]
Funding OrganizationNational Natural Science Foundation of China ; Major Program of National Natural Science Foundation of China ; Key Research Program of Frontier Sciences, CAS ; Sichuan Science and Technology program
WOS Research AreaBiodiversity & Conservation ; Environmental Sciences & Ecology ; Urban Studies
WOS SubjectBiodiversity Conservation ; Ecology ; Environmental Sciences ; Urban Studies
WOS IDWOS:000522902400001
PublisherSPRINGER
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/133403
Collection中国科学院地理科学与资源研究所
Corresponding AuthorCui, Yifei
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China
2.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.Tsinghua Univ, State Key Lab Hydrosci & Engn, Beijing 100084, Peoples R China
5.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Jin, Wen,Cui, Yifei,Wu, Shengnan,et al. Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone[J]. URBAN ECOSYSTEMS,2020:12.
APA Jin, Wen,Cui, Yifei,Wu, Shengnan,&Cheng, Deqiang.(2020).Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone.URBAN ECOSYSTEMS,12.
MLA Jin, Wen,et al."Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone".URBAN ECOSYSTEMS (2020):12.
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