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Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes
Zhang, Hui1,2; Yu, Jingjie1,2; Wang, Ping1,2; Wang, Tianye3; Li, Yonghua4,5
2021-06-01
Source PublicationJOURNAL OF HYDROLOGY
ISSN0022-1694
Volume597Pages:15
Corresponding AuthorYu, Jingjie(yujj@igsnrr.ac.cn) ; Wang, Ping(wangping@igsnrr.ac.cn)
AbstractAs 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.
KeywordRecharge source Hydrogeochemical evolution River-groundwater-spring-lake system Groundwater-fed oasis Dunhuang West Lake Wetland
DOI10.1016/j.jhydrol.2021.126154
WOS KeywordSHULE RIVER-BASIN ; SURFACE-WATER ; HYDROGEOCHEMICAL EVOLUTION ; STABLE-ISOTOPES ; DUNHUANG BASIN ; MIDDLE REACHES ; RECHARGE ; CATCHMENT ; SALINITY ; SPRINGS
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41877165] ; bidding task of Jiuquan Danghe River Basin Water Resources Administration Bureau: analysis and research on ecological background check and eco-hydrological monitoring of Dunhuang West Lake National Nature Reserve and its surrounding areas[JQDHXHSTSW/JC-2018.06]
Funding OrganizationNational Natural Science Foundation of China ; bidding task of Jiuquan Danghe River Basin Water Resources Administration Bureau: analysis and research on ecological background check and eco-hydrological monitoring of Dunhuang West Lake National Nature Reserve and its surrounding areas
WOS Research AreaEngineering ; Geology ; Water Resources
WOS SubjectEngineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS IDWOS:000652835600047
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/163970
Collection中国科学院地理科学与资源研究所
Corresponding AuthorYu, Jingjie; Wang, Ping
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Zhengzhou Univ, Sch Water Conservancy Engn, Zhengzhou 450001, Peoples R China
4.Chinese Acad Forestry, Inst Desertificat Studies, Beijing 100091, Peoples R China
5.State Forestry Adm, Kumtag Desert Ecosyst Res Stn, Dunhuang 736200, Peoples R China
Recommended Citation
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]. JOURNAL OF HYDROLOGY,2021,597:15.
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,597,15.
MLA Zhang, Hui,et al."Groundwater-fed oasis in arid Northwest China: Insights into hydrological and hydrochemical processes".JOURNAL OF HYDROLOGY 597(2021):15.
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