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DOI	10.5194/hess-22-3473-2018
	Delineating multiple salinization processes in a coastal plain aquifer; northern China: Hydrochemical and isotopic evidence
	Han D.; Currell M.J.
发表日期	2018
ISSN	1027-5606
起始页码	3473
结束页码	3491
卷号	22 期号:6
英文摘要	Groundwater is an important water resource for agricultural irrigation and urban and industrial utilization in the coastal regions of northern China. In the past 5 decades, coastal groundwater salinization in the Yang-Dai river plain has become increasingly serious under the influence of anthropogenic activities and climatic change. It is pivotal for the scientific management of coastal water resources to accurately understand groundwater salinization processes and their causative factors. Hydrochemical (major ion and trace element) and stable isotopic (δ;18O and δ2H) analysis of different water bodies (surface water, groundwater, geothermal water and seawater) were conducted to improve understanding of groundwater salinization processes in the plain's Quaternary aquifer. Saltwater intrusion due to intensive groundwater pumping is a major process, either by vertical infiltration along riverbeds which convey saline surface water inland, and/or direct subsurface lateral inflow. Trends in salinity with depth indicate that the former may be more important than previously assumed. The proportion of seawater in groundwater is estimated to have reached up to 13 % in shallow groundwater of a local well field. End-member mixing calculations also indicate that the geothermal water with high total dissolved solids (up to 10.6 g L-1) with depleted stable isotope compositions and elevated strontium concentrations (10 mg L-1) also mixes locally with water in the overlying Quaternary aquifers. This is particularly evident in samples with elevated Sr • Cl ratios (0.005 mass ratio). Deterioration of groundwater quality by salinization is also clearly exacerbated by anthropogenic pollution. Nitrate contamination via intrusion of heavily polluted marine water is evident locally (e.g., in the Zaoyuan well field); however, more widespread nitrate contamination due to other local sources such as fertilizers and/or domestic wastewater is evident on the basis of NO3 • Cl ratios. This study provides an example of how multiple geochemical indicators can delineate different salinization processes and guide future water management practices in a densely populated water-stressed coastal region. © 2018 Author(s).
语种	英语
scopus关键词	Aquifers; Chlorine; Coastal zones; Groundwater pollution; Hydrochemistry; Hydrogeology; Infiltration; Isotopes; Marine pollution; Nitrates; River pollution; Salt water intrusion; Seawater; Surface waters; Trace elements; Water management; Water quality; Agricultural irrigation; Anthropogenic activity; Anthropogenic pollution; Coastal Plain Aquifers; Geochemical indicators; Groundwater salinizations; Industrial utilization; Total dissolved solids; Groundwater resources; alluvial plain; anthropogenic source; coastal aquifer; coastal plain; coastal water; domestic waste; groundwater pollution; infiltration; nitrate; salinization; stable isotope; strontium; water management; water resource; China
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159990
作者单位	Han, D., Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China, College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China; Currell, M.J., School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
推荐引用方式 GB/T 7714	Han D.,Currell M.J.. Delineating multiple salinization processes in a coastal plain aquifer; northern China: Hydrochemical and isotopic evidence[J],2018,22(6).
APA	Han D.,&Currell M.J..(2018).Delineating multiple salinization processes in a coastal plain aquifer; northern China: Hydrochemical and isotopic evidence.Hydrology and Earth System Sciences,22(6).
MLA	Han D.,et al."Delineating multiple salinization processes in a coastal plain aquifer; northern China: Hydrochemical and isotopic evidence".Hydrology and Earth System Sciences 22.6(2018).