干旱区生态环境知识资源中心(Arid): Groundwater mixing in shallow aquifers stressed by land cover/land use changes under hyper-arid conditions

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DOI	10.1016/j.jhydrol.2021.126245
	Groundwater mixing in shallow aquifers stressed by land cover/land use changes under hyper-arid conditions
	Khalil, Mahmoud M.; Tokunaga, Tomochika; Heggy, Essam; Abotalib, Abotalib Z.
通讯作者	Abotalib, AZ (corresponding author), Univ Southern Calif, Viterbi Sch Engn, Los Angeles, CA 90007 USA.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	598
英文摘要	The impact of land cover/land use (LCLU) changes on surface runoff and groundwater contamination have been widely investigated, yet their impact on groundwater mixing is still poorly understood. The stress on resources in the Nile Delta triggered a vast migration of urban, agricultural, and industrial activities to its desert fringes exposing the Quaternary alluvial aquifers to contamination and introducing new sources of recharge. Here, we integrated remote sensing, chemical, and isotopic data with multivariate statistical analysis to identify groundwater sources and the mixing dynamics in response to LCLU changes. LCLU analysis indicated an increase of agricultural and urban areas from 84 km(2) to 470.5 km(2) between 1972 and 2018. These changes introduced new recharge sources including wastewater and irrigation return. Three major water sources were defined including: (1) modern precipitation (cluster 3 and Miocene aquifer; delta O-18: -4.59 to -0.47%, and delta H-2: -34.4 to 3.1%) with an estimated annual recharge of 11-13.5 x 10(6) m(2) and 5.1-6.2 x 10(6) m(2) for El-Gafra and El-Watan catchments, respectively, (2) old Nile water (subcluster 1.1; delta O-18: -0.87 to -0.53%, and delta H-2: 1 to 3.7), and (3) modern Nile water (cluster 2; delta O-18: 0.49 to 2.71%, and delta H-2: 10.5 to 24.4%). Moreover, three mixed groups were defined including: (1) a mixture of modern precipitation, wastewater and irrigation return (cluster 4; delta O-18: -1.02 to 0.37%, and delta H-2: -9.3 to 6.4%), (2) a mixture of old Nile waters and modern precipitation (subcluster 1.3; delta O-18: -1.74 to -1.38%, and delta H-2: -6.8 to -2.3%), and (3) a mixture of more than two sources with wide ranges of isotopic and chemical compositions (subclusters 1.2 and 1.4). These findings provide a good basis for further studies of groundwater mixing and assessment of contamination sources in shallow aquifers stressed by LCLU changes in hyper-arid environments.
英文关键词	Hyper-arid areas Isotopes Multivariate statistics Groundwater mixing Land cover change
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000661813200080
WOS关键词	MULTIVARIATE STATISTICAL-ANALYSIS ; NILE DELTA ; QUATERNARY AQUIFER ; EASTERN DESERT ; WATER ; BASIN ; FLOW ; RESOURCES ; EVOLUTION ; ISOTOPES
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/2XILL650/350907
作者单位	[Khalil, Mahmoud M.] Minia Univ, Fac Sci, Geol Dept, El Minia 61519, Egypt; [Tokunaga, Tomochika] Univ Tokyo, Grad Sch Frontier Sci, Dept Environm Syst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778563, Japan; [Heggy, Essam; Abotalib, Abotalib Z.] Univ Southern Calif, Viterbi Sch Engn, Los Angeles, CA 90007 USA; [Heggy, Essam] CALTECH, Jet Prop Lab, Pasadena, CA USA; [Abotalib, Abotalib Z.] Natl Author Remote Sensing & Space Sci, Div Geol Applicat & Mineral Resources, Cairo, Egypt
推荐引用方式 GB/T 7714	Khalil, Mahmoud M.,Tokunaga, Tomochika,Heggy, Essam,et al. Groundwater mixing in shallow aquifers stressed by land cover/land use changes under hyper-arid conditions[J],2021,598.
APA	Khalil, Mahmoud M.,Tokunaga, Tomochika,Heggy, Essam,&Abotalib, Abotalib Z..(2021).Groundwater mixing in shallow aquifers stressed by land cover/land use changes under hyper-arid conditions.JOURNAL OF HYDROLOGY,598.
MLA	Khalil, Mahmoud M.,et al."Groundwater mixing in shallow aquifers stressed by land cover/land use changes under hyper-arid conditions".JOURNAL OF HYDROLOGY 598(2021).