干旱区生态环境知识资源中心(Arid): Humans reshape wetlands: Unveiling the last 100 years of morphological changes of the Mara Wetland, Tanzania

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DOI	10.1016/j.scitotenv.2019.07.189
	Humans reshape wetlands: Unveiling the last 100 years of morphological changes of the Mara Wetland, Tanzania
	Bregoli, F.1; Crosato, A.1,2; Paron, P.1; McClain, M. E.1,2
通讯作者	Bregoli, F.
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2019
卷号	691 页码:896-907
英文摘要	The Lower Mara River and Wetland. Tanzania, is an impoitant ecosystem and unique water resource for a vast semi-arid area The river, an affluent of Lake Victoria, and the wetland are experiencing morphological and vegetation changes resulting in channel avulsions and wetland expansion. This study analyses the changes over the last 100 years and investigates natural and anthropogenic behaviors to explain the increase of the Mara Wetland area. We collated historical topographic maps and satellite images. We conducted two field surveys in low and high flow condition with an unmanned aerial vehicle, a sonar and an ADCP. We mapped selected areas as well as the bed topography in some stretches of the river, measured discharges, and collected river bed and suspended sediment samples. The analysis of the sediments shows that the wetland system, dominated by papyrus sp. is very efficient in trapping sediment, releasing clear water to the Lake Victoria. The historical reconstruction using topographic maps, satellite images and a multivariable analysis including hydrology and land cover, shows that 4 major avulsions occurred in the last 70 years due to a combination of natural behaviors, hydrological fluctuations and anthropogenic factors such as basin deforestation, farming and grazing along the river banks and in the wetland. Each avulsion led to substantial expansion of the wetland. Combined, they increased the wetland area by a factor of 3.6. Describing the Lower Mara River dynamic behavior, this work provides relevant information for sustainable future water and sediment management in order to preserve wetland habitats and natural resources. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Wetland expansion River avulsion Wetland sedimentation Lake Victoria East Africa Mara River
类型	Article
语种	英语
国家	Netherlands
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000504009600086
WOS关键词	ECOSYSTEM SERVICES ; LAKE VICTORIA ; SOIL-EROSION ; LAND-USE ; RIVER ; SEDIMENT ; PAPYRUS ; IMPACT ; DELTA ; WATER
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2019-11-15
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310870
作者单位	1.IHE Delft Inst Water Educ, Dept Water Sci & Engn, Westvest 7, NL-2611 AX Delft, Netherlands; 2.Delft Univ Technol, Fac Civil Engn & Geosci, Bldg 23,Stevinweg 1, NL-2628 CN Delft, Netherlands
推荐引用方式 GB/T 7714	Bregoli, F.,Crosato, A.,Paron, P.,et al. Humans reshape wetlands: Unveiling the last 100 years of morphological changes of the Mara Wetland, Tanzania[J],2019,691:896-907.
APA	Bregoli, F.,Crosato, A.,Paron, P.,&McClain, M. E..(2019).Humans reshape wetlands: Unveiling the last 100 years of morphological changes of the Mara Wetland, Tanzania.SCIENCE OF THE TOTAL ENVIRONMENT,691,896-907.
MLA	Bregoli, F.,et al."Humans reshape wetlands: Unveiling the last 100 years of morphological changes of the Mara Wetland, Tanzania".SCIENCE OF THE TOTAL ENVIRONMENT 691(2019):896-907.