干旱区生态环境知识资源中心(Arid): Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001-2023) in the lower Heihe River, Northwest China

Arid

DOI	10.3389/fenvs.2024.1376443
	Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001-2023) in the lower Heihe River, Northwest China
	Zhang, Jialing; Wang, Ping; Liu, Shiqi; Yu, Jingjie
通讯作者	Wang, P ; Liu, SQ
来源期刊	FRONTIERS IN ENVIRONMENTAL SCIENCE
EISSN	2296-665X
出版年	2024
卷号	12
英文摘要	The geochemical processes of groundwater in arid regions are generally influenced by both natural hydrological processes and human activities. However, impacts of water-rock interactions on groundwater recharge via hydrological processes, controlled by both intermittent river water flow and groundwater withdrawals, is still poorly understood. In this study, 327 groundwater chemistry datasets collected from the upper, middle (including Gobi and riparian zones), and lower regions of the Ejina Delta in Northwest China from 2001 to 2023 were analyzed. Our results revealed that the total dissolved solids (TDS) concentration of groundwater in Ejina Delta ranged from approximately 881.5 +/- 331.6 mg/L in the upper regions to 1,953.6 +/- 1,208.5 mg/L in the lower regions, with an increasing trend observed. Ecological water conveyance (EWC), recharging aquifer through intermittent river water flow, resulted in a decrease in TDS concentrations from 2001 to 2023 mainly in the upper region. While irrigation notably affected groundwater chemistry in the lower region, resulting in a substantial increase in groundwater salinity. Groundwater chemistry in the Middle Gobi region remained relatively stable over the study period. Generally, the hydrochemical composition shifted from the Na-Mg-SO4-HCO3 and Na-Mg-Ca-SO4-HCO3 types in the upper region to Na-Mg-SO4-HCO3 and Na-Mg-SO4-Cl types in the lower region, with Na-SO4-Cl predominant in the Middle Gobi. These shifts were likely be attributed to the interplay of water-rock interactions, coupled with evaporation-crystallization processes. Inverse modeling using PHREEQC revealed that in the upper-middle region, primary water-rock interactions involved calcite dissolution and the precipitation of dolomite, gypsum, halite, and sylvite salts, as well as cation exchange reactions (2NaX+Ca2+-> CaX2+2Na+). In contrast, the hydrogeological system in the middle-lower region exhibited an opposite pattern of water-rock interactions. Overall, ecological water conveyance partially facilitated water-rock interactions during lateral groundwater flow, while irrigation disrupted the natural hydrogeochemical equilibrium, involving halite dissolution and opposite cation exchange reactions compared to other regions.
英文关键词	groundwater hydrochemistry Ejina Delta conceptual model water-rock interaction human activities
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001236738500001
WOS关键词	SURFACE-WATER ; EJINA BASIN ; HYDROCHEMICAL CHARACTERISTICS ; GEOCHEMICAL PROCESSES ; STABLE-ISOTOPES ; MIDDLE REACHES ; INNER-MONGOLIA ; RECHARGE ; EVOLUTION ; DYNAMICS
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/2XILL650/403831
推荐引用方式 GB/T 7714	Zhang, Jialing,Wang, Ping,Liu, Shiqi,et al. Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001-2023) in the lower Heihe River, Northwest China[J],2024,12.
APA	Zhang, Jialing,Wang, Ping,Liu, Shiqi,&Yu, Jingjie.(2024).Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001-2023) in the lower Heihe River, Northwest China.FRONTIERS IN ENVIRONMENTAL SCIENCE,12.
MLA	Zhang, Jialing,et al."Mechanism controlling groundwater chemistry in the hyper-arid basin with intermittent river flow: insights from long-term observations (2001-2023) in the lower Heihe River, Northwest China".FRONTIERS IN ENVIRONMENTAL SCIENCE 12(2024).