干旱区生态环境知识资源中心(Arid): Assessing catchment-scale groundwater discharge: Optimal tracers and factors analysis

Arid

DOI	10.1016/j.jenvman.2024.121798
	Assessing catchment-scale groundwater discharge: Optimal tracers and factors analysis
	Xia, Yun; Xiao, Jun; Wang, Wanzhou; Yan, Xin; Li, Zhi
通讯作者	Li, Z
来源期刊	JOURNAL OF ENVIRONMENTAL MANAGEMENT
ISSN	0301-4797
EISSN	1095-8630
出版年	2024
卷号	366
英文摘要	Identifying streamwater-groundwater interactions (SGI) is crucial for effective water resource management, especially in arid and semi-arid regions. Despite the effectiveness of tracers in detecting these interactions, their large-scale application is challenged by the variability in tracer characteristics and natural conditions. This study addresses these challenges through extensive research across seven watersheds (7636-60,916 km 2 ) in China 's Loess Plateau (CLP). We utilized multiple physicochemical and stable isotope tracers (8 2 H and 8 18 O) to elucidate the spatiotemporal variations and controlling factors of SGI, and to estimate uncertainties in quantifying SGI using various indicators during unidirectional water exchange periods. Our findings indicated that groundwater discharge into streamwater dominates SGI in the CLP, with mean discharge ratios (the percentage of river flow that originates from groundwater discharge) varying from 10% to 57%. Significant spatial variability was observed both across and within watersheds. The central watersheds exhibited lower discharge ratios (23 +/- 11%) compared to the northern (29 +/- 12%) and southern (25 +/- 13%) watersheds. The upper reaches showed higher discharge ratios (28 +/- 12%) compared to the middle and lower reaches (22 +/- 8%). Loess thickness and vegetation primarily limit groundwater discharge by affecting groundwater storage and water flow velocity. The utilization of individual isotopic or hydrochemical indicators introduces large uncertainties in quantifying groundwater discharge ratios due to isotope fractionation or water-rock interaction, while the combination of these two indicators can reduce uncertainties in quantifying SGI. This study provides valuable insights for selecting environmental tracers to quantify SGI, contributing to sustainable water resource management in arid and semi-arid regions.
英文关键词	Streamwater-groundwater interaction Stable isotopes Uncertainty sources MixSIAR Loess-covered area
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001272107700001
WOS关键词	SURFACE-WATER INTERACTIONS ; LOESS PLATEAU ; STABLE-ISOTOPES ; VEGETATION ; RIVER ; HYDROLOGY
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/2XILL650/404484
推荐引用方式 GB/T 7714	Xia, Yun,Xiao, Jun,Wang, Wanzhou,et al. Assessing catchment-scale groundwater discharge: Optimal tracers and factors analysis[J],2024,366.
APA	Xia, Yun,Xiao, Jun,Wang, Wanzhou,Yan, Xin,&Li, Zhi.(2024).Assessing catchment-scale groundwater discharge: Optimal tracers and factors analysis.JOURNAL OF ENVIRONMENTAL MANAGEMENT,366.
MLA	Xia, Yun,et al."Assessing catchment-scale groundwater discharge: Optimal tracers and factors analysis".JOURNAL OF ENVIRONMENTAL MANAGEMENT 366(2024).