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Evolution of groundwater hydrochemical characteristics and formation mechanism during groundwater recharge: A case study in the Hutuo River alluvial–pluvial fan, North China Plain

Science of The Total Environment, ISSN: 0048-9697, Vol: 915, Page: 170159
2024
  • 10
    Citations
  • 0
    Usage
  • 12
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    12

Article Description

A pilot project for groundwater recharge from rivers is currently being carried out in North China Plain. To investigate the influence of river recharge on groundwater hydrochemical characteristics, dynamic monitoring and analysis of groundwater samples were conducted at a typical recharge site in the Hutuo River alluvial-pluvial fan in the North China Plain from 2019 to 2021. Hydrochemical, isotopic, and multivariate statistical analyses were used to systematically reveal the spatiotemporal variation of groundwater chemistry and its driving factors during groundwater recharge process. The results showed that the groundwater hydrochemical types and characteristics in different recharge areas and recharge periods exhibited obvious spatiotemporal differences. The groundwater type varied from HCO 3 ·SO 4 -Na·Mg to HCO 3 ·SO 4 -Ca·Mg in an upstream ecological area, while the groundwater type changed from SO 4 ·HCO 3 -Mg·Ca to HCO 3 ·SO 4 -Ca·Mg in the downstream impacted by reclaimed water. Changes in the contents of Ca 2+, Mg 2+ and HCO 3 − were mostly controlled by the water–rock interactions and mixing-dilution of recharge water, while the increases in Na +, NO 3 −, Cl −, SO 4 2− and NO 3 − contents were mainly due to the infiltration of reclaimed water. Nitrogen and oxygen isotope (δ 15 N and δ 18 O) tests and the Bayesian isotope mixing model results further demonstrated that nitrate pollution mainly originated from anthropogenic sources, and the major contribution came from manure and sewage, with an average proportion of 64.6 %. Principal component analysis indicated that water–rock interactions, river-groundwater mixing and redox environment alternation were dominant factors controlling groundwater chemical evolution in groundwater recharge process.

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