干旱区生态环境知识资源中心(Arid): Linking precipitation and groundwater isotopes in Ethiopia - Implications from local meteoric water lines and isoscapes

Arid

DOI	10.1016/j.jhydrol.2021.126074
	Linking precipitation and groundwater isotopes in Ethiopia - Implications from local meteoric water lines and isoscapes
	Bedaso, Zelalem; Wu, Shuang-Ye
通讯作者	Bedaso, Z (corresponding author), Univ Dayton, Dept Geol, 300 Coll Pk, Dayton, OH 45469 USA.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	596
英文摘要	Sustainable water resource management requires a clear understanding of the spatial variation and seasonal recharge of groundwater and their links to local precipitation. A combined spatial analysis of the stable isotope composition of groundwater, surface water, and precipitation could help to understand groundwater sources and recharge processes. In this study, we collected 297 groundwater and stream water samples across Ethiopia and analyzed them for the oxygen and hydrogen isotope ratios. The isotope data were then interpolated into isoscapes for the entire country using the Cokriging method based on their spatial autocorrelation and covariance with elevation, annual mean precipitation, and temperature. These are the first groundwater and stream isoscapes for Ethiopia. By comparing the spatial isotopic distribution of the two water resources with local precipitation, we showed distinct groundwater recharge patterns in different regions in terms of their water sources, timing, seasonality, and the degree of surface and groundwater interaction. We found that the groundwater recharge was generally biased towards the main rainy season. However, in the relatively dry southeastern Ethiopia, groundwater could receive significant input from infrequent high-intensity rainfalls associated with tropical cyclones, but additional precipitation and groundwater isotope data are needed to further test our hypothesis in this data-poor region. Overall, this study has largely expanded the spatial coverage of water stable isotope data and filled significant data gaps in Ethiopia, which could be used to provide vital information in the arid and semi-arid parts of the country where water resources are critical in climate change adaptation strategies.
英文关键词	Isotope D-excess Isoscape Groundwater Recharge Ethiopia
类型	Article
语种	英语
收录类别	SCI-E ; SSCI
WOS记录号	WOS:000642334400049
WOS关键词	STABLE-ISOTOPES ; SURFACE-WATER ; AQUIFER SYSTEM ; RIVER-BASIN ; RECHARGE ; HYDROGEN ; SUMMER ; AREA ; VARIABILITY ; DELTA-O-18
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368802
作者单位	[Bedaso, Zelalem; Wu, Shuang-Ye] Univ Dayton, Dept Geol, 300 Coll Pk, Dayton, OH 45469 USA
推荐引用方式 GB/T 7714	Bedaso, Zelalem,Wu, Shuang-Ye. Linking precipitation and groundwater isotopes in Ethiopia - Implications from local meteoric water lines and isoscapes[J],2021,596.
APA	Bedaso, Zelalem,&Wu, Shuang-Ye.(2021).Linking precipitation and groundwater isotopes in Ethiopia - Implications from local meteoric water lines and isoscapes.JOURNAL OF HYDROLOGY,596.
MLA	Bedaso, Zelalem,et al."Linking precipitation and groundwater isotopes in Ethiopia - Implications from local meteoric water lines and isoscapes".JOURNAL OF HYDROLOGY 596(2021).