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	Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China
	Liu Q.; Li, F. D.; Li, J.; Luo, B.; Huang, C.
	2016
关键词	Deltas Irrigation water Water mixing Salinization and freshening Geochemistry Stable isotopes sediment discharge surface-water laizhou bay aquifer plain evolution salinity soil constraints pollution
英文摘要	This paper aims to improve the current knowledge of groundwater salinization processes of a young coastal aquifer in the Yellow River Delta (YRD) and to assess the impact of both the transfer of irrigation water from the Yellow River and seawater intrusion, using a combination of hydrochemical-isotopic measurements. The major ion/Cl- ratios generally closely follow the mixing line between freshwater end-member (the Yellow River) and saline water end-members (salt groundwater or seawater), indicating the importance of mixing under natural and anthropogenic influences. The examination of stable isotope in groundwater (ranging from -9.0 to -3.5 parts per thousand for delta O-18 and from -73 to -29 % for delta D, respectively) and chloride concentrations (similar to 2 to 629 meq/L) confirms that the saline end-member is associated with saltwater rather than present seawater, and most groundwater samples are plotted on mixing lines between the Yellow River and saltwater. The similar range in stable isotopes (delta O-18 and delta D) and Cl- compositions between saltwater and confined aquifer supports the hypothesis that upward seepage of confined saline water intruded the shallow aquifer. Moreover, the deviations in some cases from mixing line imply water-rock interaction is also important in dominant control on groundwater chemistry, such as cation exchange, SO42- reduction, and NaCl solution. The brackish water was characterized by slight excess of Na+ and deficit of Ca2+ compared to non-reactive mixing line. This indicates that the coastal aquifer is generally freshening with respect to extensive irrigation network, as well as the transfer from the Yellow River for ecological recharge into wetland.
出处	Environmental Earth Sciences
卷	75
期	14
语种	英语
ISSN号	1866-6280
DOI标识	10.1007/s12665-016-5918-5
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/43092]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Liu Q.,Li, F. D.,Li, J.,et al. Geochemical and isotopic evidence of shallow groundwater salinization in a reclaimed coastal zone: the Yellow River Delta, China. 2016.

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