RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (04): 598-605.doi: 10.11870/cjlyzyyhj201704013

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HYDROCHEMICAL CHARACTERISTICS AND FORMATION MECHANISM OF THE GROUNDWATER IN YANCHENG, JIANGSU PROVINCE

ZHANG Yan1,2, FU Chang-chang3, MAO Lei1,2, GONG Xu-long1,2, LI Xiang-quan3   

  1. 1. Geological Survey of Jiangsu Province, Nanjing 210080, China;
    2. Key Laboratory of Earth Fissures Geological Disaster, Ministry of Land and resources, Nanjing 210080, China;
    3. Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China
  • Received:2016-09-02 Revised:2016-10-17 Online:2017-04-20
  • Supported by:
    China Geological Survey's Project (1212011220005, 12120114086601);Jiangsu Geological Exploration Fund ([2014]842)

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Abstract: For the purpose of investigating the main factors of deep groundwater salinization in the coastal plain of Yanchen, Jiangsu Province, various water samples (river water, shallow groundwater, deep groundwater and seawater) were collected to analyze their characteristics of hydrochemistry and isotopes. On the basis of the analysis of the environment isotopes (δ18O-δ2H), the characteristics of major hydrochemical composition and the ratios of major ions, the results suggested that dissolving the salts of strata and evaporation are the dominant processes in the evolvement of shallow brackish groundwater, and some shallow brackish samples in Binhaigang areas are possibly affected by seawater intrusion. The distribution of deep brackish groundwater is mainly in two areas; one is located along the coastal areas, while the other is in the inland areas of Dafeng and its surrounding areas. Dissolving salts of ancient marine strata is the major cause for the salinity of the deep confined groundwater in eastern coastal areas; moreover, some deep groundwater may be also influenced by seawater intrusion, such as YC2012 in Huangshagang. Among the inland areas surrounding Dafeng, the deep brackish groundwater is caused by mixing with overlying shallow saline groundwater. The water quality of the deep aquifer in central and western areas is good as a whole, and the hydrochemical evolution is the natural water-rock interaction. Hence, the deep aquifer groundwater in eastern coastal areas where TDS is high should be protected effectively, especially the salified areas such as the town of Binhaigang.

Key words: groundwater, hydrochemical characteristics, formation mechanism, Yancheng area

CLC Number: 

  • P641.12
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