Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone

doi:10.1007/s11252-020-00989-1

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地灾害与地表过程重点实验室

	Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone
	Jin Wen 2,3,4; Cui Yifei 5; Wu Shengnan 1,2; Cheng Deqiang 2,3
刊名	URBAN ECOSYSTEMS
	2020
卷号	23 期号:5 页码:1141-1152
关键词	Ecological risk Urban expansion Forest degeneration Trend analysis Mountain area Freetown
ISSN号	1083-8155
DOI	10.1007/s11252-020-00989-1
产权排序	1
文献子类	Article
英文摘要	Land 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.
电子版国际标准刊号	1573-1642
资助项目	National 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]
WOS关键词	LAND-COVER CHANGE ; HURST EXPONENT ; LANDSCAPE ; RIVER ; SOIL ; INDEXES ; BASIN ; LANDSLIDES ; XINJIANG ; PLATEAU
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology ; Urban Studies
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000522902400001
资助机构	National 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
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/34119]
专题	成都山地灾害与环境研究所_山地灾害与地表过程重点实验室
通讯作者	Cui Yifei
作者单位	1.Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 2.University of Chinese Academy of Sciences, Beijing 100049, China; 3.Key Laboratory of Mountain Hazards and Earth Surface Process, Chinese Academy of Sciences, Chengdu 610041, China; 4.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 5.State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China;
推荐引用方式 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,2020,23(5):1141-1152.
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,23(5),1141-1152.
MLA	Jin Wen,et al."Ecological risk resonance of urbanization and its effect on geohazard disaster: the case of Freetown, Sierra Leone".URBAN ECOSYSTEMS 23.5(2020):1141-1152.