DOI: 10.5194/hess-20-1983-2016
Scopus记录号: 2-s2.0-84969769919
论文题名: Identification of anthropogenic and natural inputs of sulfate into a karstic coastal groundwater system in northeast China: Evidence from major ions, δ13 CDIC and δ34SSO4
作者: Han D ; , Song X ; , Currell M ; J
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2016
卷: 20, 期: 5 起始页码: 1983
结束页码: 1999
语种: 英语
Scopus关键词: Agriculture
; Aquifers
; Carbon
; Fertilizers
; Groundwater
; Groundwater flow
; Groundwater geochemistry
; Groundwater resources
; Isotopes
; Quality control
; Sulfate minerals
; Sulfur compounds
; Anthropogenic impacts
; Brackish ground water
; Groundwater abstraction
; Hydraulic connection
; Hydrochemical evolution
; Hydrogeochemical process
; Irrigation return flows
; Sulfate concentrations
; Hydrochemistry
; anthropogenic effect
; brackish water
; carbon isotope
; carbonate group
; facies analysis
; freshwater input
; groundwater
; groundwater abstraction
; groundwater flow
; hydrogeochemistry
; identification method
; karst hydrology
; Quaternary
; saline intrusion
; sulfate
; sulfur isotope
; water chemistry
; China
; Dalian
; Liaoning
英文摘要: The hydrogeochemical processes controlling groundwater evolution in the Daweijia area of Dalian, northeast China, were characterised using hydrochemistry and isotopes of carbon and sulfur (δ13 CDIC and δ34SSO4). The aim was to distinguish anthropogenic impacts as distinct from natural processes, with a particular focus on sulfate, which is found at elevated levels (range: 54.4 to 368.8 mg L-1; mean: 174.4 mg L-1) in fresh and brackish groundwater. The current investigation reveals minor seawater intrusion impact (not exceeding 5% of the overall solute load), in contrast with extensive impacts observed in 1982 during the height of intensive abstraction. This indicates that measures to restrict groundwater abstraction have been effective. However, hydrochemical facies analysis shows that the groundwater remains in a state of ongoing hydrochemical evolution (towards Ca-Cl type water) and quality degradation (increasing nitrate and sulfate concentrations). The wide range of NO3 concentrations (74.7-579 mg L-1) in the Quaternary aquifer indicates considerable input of fertilisers and/or leakage from septic systems. Both δ13C (-14.5 to-5.9 ‰) and δ34SSO4 (+5.4 to +13.1 ‰) values in groundwater show increasing trends along groundwater flow paths. While carbonate minerals may contribute to increasing δ13 CDIC and δ34SSO4 values in deep karstic groundwater, high loads of agricultural fertilisers reaching the aquifer via irrigation return flow are likely the main source of the dissolved sulfate in Quaternary groundwater, as shown by distinctive isotopic ratios and a lack of evidence for other sources in the major ion chemistry. According to isotope mass balance calculations, the fertiliser contribution to overall sulfate has reached an average of 62.1% in the Quaternary aquifer, which has a strong hydraulic connection to the underlying carbonate aquifer. The results point to an alarming level of impact from the local intensive agriculture on the groundwater system, a widespread problem throughout China. © 2016 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78838
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China; School of Civil, Environmental and Chemical Engineering, RMIT University, Melbourne, VIC, Australia
Recommended Citation:
Han D,, Song X,, Currell M,et al. Identification of anthropogenic and natural inputs of sulfate into a karstic coastal groundwater system in northeast China: Evidence from major ions, δ13 CDIC and δ34SSO4[J]. Hydrology and Earth System Sciences,2016-01-01,20(5)