干旱区生态环境知识资源中心(Arid): Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes

Arid

DOI	10.1016/j.jhydrol.2021.126154
	Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes
	Zhang, Hui; Yu, Jingjie; Wang, Ping; Wang, Tianye; Li, Yonghua
通讯作者	Yu, JJ ; Wang, P (corresponding author), Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China.
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2021
卷号	597
英文摘要	As an inland groundwater-fed oasis in northwest China, the Dunhuang West Lake Wetland (DWLW) has been threatened by decreasing groundwater recharge over the past several decades. Understanding recharging processes for DWLW is a key step for better protection of the oasis, but poorly studied. To this end, we carried out a comprehensive water chemistry and isotope sampling and analysis, by taking the oasis and its water sources as a complete system to reveal the oasis water recharging mechanism and flow paths. Water samples, including mountain snowmelt water, river water, groundwater, spring and lake water, were collected within and around the DWLW, and their environmental isotopes (delta O-18 and delta D) and water chemistry were analysed. Results showed that the stable isotope values exhibited strong spatial variations, ranging from -90.69 parts per thousand to -42.45 parts per thousand for dD and from -13.81 parts per thousand to -2.90 parts per thousand for delta O-18. The isotope values were extremely depleted for snowmelt water, followed by river water, groundwater, spring water, and were most enriched in lake water. The difference in isotopic values from the different water bodies indicates that seasonal rivers primarily originate from the snowmelt water in the adjacent mountains, discharge into the aquifer through infiltration, then groundwater rises up by forms of springs to the lake oases, the river and groundwater interacted frequently, causing significant changes in solute in different positions. The ion concentrations accumulated continuously along the flow path, the total dissolved solid content varied from 416 mg/L in river water to 20360 mg/L in lake water, and the dominant anion facies changed systematically from HCO3- to SO42- then Cl-. The ionic ration plot, chlor-alkali index and saturation index demonstrated that dissolution of minerals plays a major role in the change in chemical composition, and other processes such as carbonate precipitation associated with cation exchange reaction also influence the chemical composition. Our results are helpful for understanding the hydrological and hydrochemical processes in arid groundwater-fed oases, and can be also useful for rational management and assessment of regional-scale groundwater resources in oases.
英文关键词	Recharge source Hydrogeochemical evolution River-groundwater-spring-lake system Groundwater-fed oasis Dunhuang West Lake Wetland
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000652835600047
WOS关键词	SHULE RIVER-BASIN ; HYDROGEOCHEMICAL EVOLUTION ; STABLE-ISOTOPES ; DUNHUANG BASIN ; MIDDLE REACHES ; SURFACE-WATER ; RECHARGE ; CATCHMENT ; SALINITY ; SPRINGS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
来源机构	中国科学院地理科学与资源研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/350899
作者单位	[Zhang, Hui; Yu, Jingjie; Wang, Ping] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China; [Zhang, Hui; Yu, Jingjie; Wang, Ping] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Wang, Tianye] Zhengzhou Univ, Sch Water Conservancy Engn, Zhengzhou 450001, Peoples R China; [Li, Yonghua] Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China; [Li, Yonghua] State Forestry Adm, Kumtag Desert Ecosyst Res Stn, Dunhuang 736200, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Hui,Yu, Jingjie,Wang, Ping,et al. Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes[J]. 中国科学院地理科学与资源研究所,2021,597.
APA	Zhang, Hui,Yu, Jingjie,Wang, Ping,Wang, Tianye,&Li, Yonghua.(2021).Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes.JOURNAL OF HYDROLOGY,597.
MLA	Zhang, Hui,et al."Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes".JOURNAL OF HYDROLOGY 597(2021).