干旱区生态环境知识资源中心(Arid): Surface water and groundwater interaction in the Vredefort Dome, South Africa: a stable isotope and multivariate statistical approach

Arid

DOI	10.1007/s10661-022-10164-y
	Surface water and groundwater interaction in the Vredefort Dome, South Africa: a stable isotope and multivariate statistical approach
	Welgus, Marcja N.; Abiye, Tamiru A.
通讯作者	Welgus, MN
来源期刊	ENVIRONMENTAL MONITORING AND ASSESSMENT
ISSN	0167-6369
EISSN	1573-2959
出版年	2022
卷号	194 期号:10
英文摘要	The growing importance of groundwater as a freshwater supply in semi-arid areas such as the Vredefort Dome World Heritage Site (VDWHS) demands the judicious management and development of this vital resource. The increased demand for groundwater due to the contamination of surface water, coupled with the lack of information on hydrological interaction and associated water quality implications, present difficulties in establishing management strategies. An integrated study based on hydrochemistry and multivariate statistical techniques supplemented by environmental isotopes delineated discrete areas of surface water and groundwater interaction in a fractured-rock terrain. Surface water loss was observed in sections that exhibited declining groundwater levels, whereas limited baseflow was restricted to zones with stable groundwater levels. The multivariate statistical analysis revealed the combined effect of natural hydrochemical processes and anthropogenic sources as controlling factors of water composition, and highlighted zones of aquifer-river water mixing, where certain areas were found to be additionally polluted by human-derived contaminants. The stable isotope (O-18 and H-2) ratios confirm mixing between depleted groundwater and enriched river water, producing a composition that reflected an integration of the isotopic variations. The continuous wastewater discharge into the Vaal River combined with the increased groundwater exploitation may be prompting induced recharge conditions. The results suggest compartmentalization of the groundwater systems, where certain areas within 1 km of the channel were not influenced by river-induced contamination. This indicates that hydrological connectivity is governed by site-specific hydraulic properties. This study shows the usefulness of a multi-method approach by combining environmental isotopes, hydrochemistry, and multivariate statistics to characterize hydrological linkage in semi-arid regions.
英文关键词	Surface water and groundwater interaction Environmental isotopes Hydrochemistry Semi-arid Vredefort Dome World Heritage Site
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000841262300002
WOS关键词	MAJOR ION CHEMISTRY ; RIVER-BASIN ; SHALLOW GROUNDWATER ; HYDROCHEMICAL DATA ; VAAL RIVER ; DISCHARGE ; EXCHANGE ; FLOW ; CONNECTIVITY ; QUEENSLAND
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392479
推荐引用方式 GB/T 7714	Welgus, Marcja N.,Abiye, Tamiru A.. Surface water and groundwater interaction in the Vredefort Dome, South Africa: a stable isotope and multivariate statistical approach[J],2022,194(10).
APA	Welgus, Marcja N.,&Abiye, Tamiru A..(2022).Surface water and groundwater interaction in the Vredefort Dome, South Africa: a stable isotope and multivariate statistical approach.ENVIRONMENTAL MONITORING AND ASSESSMENT,194(10).
MLA	Welgus, Marcja N.,et al."Surface water and groundwater interaction in the Vredefort Dome, South Africa: a stable isotope and multivariate statistical approach".ENVIRONMENTAL MONITORING AND ASSESSMENT 194.10(2022).