干旱区生态环境知识资源中心(Arid): The effect of climate and land-cover changes on runoff response in Guguf spate systems, northern Ethiopia

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DOI	10.1002/ird.2326
	The effect of climate and land-cover changes on runoff response in Guguf spate systems, northern Ethiopia
	Negash, Emnet 1; Gebresamuel, Girmay 2; Embaye, Tesfa-Alem G.3; Zenebe, Amanuel 1,2
通讯作者	Negash, Emnet
来源期刊	IRRIGATION AND DRAINAGE
ISSN	1531-0353
EISSN	1531-0361
出版年	2019
卷号	68 期号:3 页码:399-408
英文摘要	Irrigated agriculture in the rainfall-deficit semi-arid lowlands of the Raya valley rely on spate systems to produce food crops. Climate and land-cover dynamics upstream are, however, threatening runoff response reaching these spate systems. The objective of this study was thus to analyse the hydrological response of dryland catchments to changing climate and land cover in Guguf spate systems. Thirty-six years of climate data were analysed using Mann-Kendall, Pettitt's test and linear regression methods, and time-series land-cover information extracted from Landsat satellite images in a remote-sensing interface. The Soil Conservation Systems curve number method was then employed to formulate the likely impact of climate and land-cover changes on runoff response, and trends analysed. Results showed that temperature, evapotranspiration and rainfall varied at least by 0.11 degrees C, 15.2 mm and -5.1 mm yr(-1) respectively, intensifying moisture stress. Moreover, improving vegetation cover in the highlands enhanced the water-abstraction capacity of the soil, impeding the runoff curve number by 9.2%. Thus, the combined effects of climate induced moisture stress and land cover led water abstraction upstream has threatened runoff response at a rate of 0.23 x 10(6) m(3) yr(-1). In other words, the runoff response reaching Guguf spate systems degenerated by 7.96 x 10(6) m(3) over 36 years. Such unusual highland-lowland hydrological linkage has therefore endangered the availability of surplus water to irrigate spate-based farms downstream. Appropriate policies and strategies would therefore be desirable to address conflicting interests in scarce water resources in the face of climate change. (c) 2019 John Wiley & Sons, Ltd.
英文关键词	climate change land-cover change runoff response spate systems threshold rainfall
类型	Article
语种	英语
国家	Ethiopia
收录类别	SCI-E
WOS记录号	WOS:000476571700003
WOS关键词	CURVE NUMBERS ; IRRIGATION
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216554
作者单位	1.Mekelle Univ, Inst Climate & Soc, Mekelle, Ethiopia; 2.Mekelle Univ, Dept Land Resource Management & Environm Protect, Mekelle, Ethiopia; 3.Mekelle Univ, Inst Water & Environm, Mekelle, Ethiopia
推荐引用方式 GB/T 7714	Negash, Emnet,Gebresamuel, Girmay,Embaye, Tesfa-Alem G.,et al. The effect of climate and land-cover changes on runoff response in Guguf spate systems, northern Ethiopia[J],2019,68(3):399-408.
APA	Negash, Emnet,Gebresamuel, Girmay,Embaye, Tesfa-Alem G.,&Zenebe, Amanuel.(2019).The effect of climate and land-cover changes on runoff response in Guguf spate systems, northern Ethiopia.IRRIGATION AND DRAINAGE,68(3),399-408.
MLA	Negash, Emnet,et al."The effect of climate and land-cover changes on runoff response in Guguf spate systems, northern Ethiopia".IRRIGATION AND DRAINAGE 68.3(2019):399-408.