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Processes and characteristics of hydrogeochemical variations between unconfined and confined aquifer systems: a case study of the Nakdong River Basin in Busan City, Korea

  • Sang Yong Chung
  • Rajesh Rajendran
  • Venkatramanan SenapathiEmail author
  • Selvam Sekar
  • Paramasivam Chellamuthu Ranganathan
  • Yun Yeong Oh
  • Hussam Eldin Elzain
Research Article

Abstract

This study is to assess the hydrogeochemical characteristics of groundwater at the deltaic region of the Nakdong River Basin in the Busan Metropolitan City of Korea. The study area is covered by the Quaternary sedimentary deposits and the Cretaceous granites associated with unconformity. The thick sedimentary deposits consists of two aquifers, i.e., unconfined and confined aquifers on the basis of clay deposit. Groundwater samples were collected from seven boreholes: two from unconfined aquifer and five from confined aquifer systems during the wet season of 2017 year. ORP and DO indicates that the groundwater of the unconfined aquifer exists in the oxidization condition and that of the confined aquifer pertains in the reduction condition. Piper’s trilinear diagram shows CaSO4 type for groundwater of the unconfined aquifer, and NaCl type for that of the confined aquifer. Ionic concentrations of groundwater increase in the confined aquifer because of direct and reverse ion exchange processes. Carbonate weathering and evaporation are other mechanisms in the water-rock interaction. Saturation indices of dolomite and calcite are observed as oversaturated, while halite reveals undersaturation. Hierarchical cluster analysis (HCA) exhibits that cluster 1 and cluster 2 represents the properties of groundwater in unconfined and confined aquifers, respectively. Factor analysis shows that groundwater of the confined aquifer is much influenced by seawater, and includes heavy metals of iron and aluminum. Groundwater samples in unconfined and confined aquifers are located at the rock weathering and evaporation zones in the Gibbs diagram. Inverse geochemical modeling of PHREEQC code suggests that carbonate dissolution and ion exchange of major ions are the prevailing geochemical processes. This comprehensive research provides the distinguished hydrogeochemical characteristics of groundwater in confined and unconfined aquifer systems of the Nakdong River Basin in Busan City, Korea.

Keywords

Hydrogeochemical analysis Geostatistical analysis Inverse geochemical modeling Unconfined aquifer Confined aquifer Nakdong River basin 

Notes

Acknowledgements

This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2019R1D1A3A03103683), and also supported by a grant (code15AWMP-B066761-03) from AWMP Program funded by the Ministry of Land, Infrastructure and Transport of Korean government.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Department of Earth and Environmental Sciences, Institute of Environmental SciencesPukyong National UniversityBusanSouth Korea
  2. 2.Department of Civil EngineeringIndian Institute of ScienceBangaloreIndia
  3. 3.Department for Management of Science and Technology DevelopmentTon Duc Thang UniversityHo Chi Minh CityVietnam
  4. 4.Faculty of Applied SciencesTon Duc Thang UniversityHo Chi Minh CityVietnam
  5. 5.Department of GeologyV. O. Chidambaram CollegeTuticorinIndia
  6. 6.Department of Remote SensingBharathidasan UniversityTiruchirappalliIndia
  7. 7.Department of Earth & Environmental Sciences, Korea-CO2 Storage Environmental Management (K-COSEM) Research CenterKorea UniversitySeoulSouth Korea
  8. 8.Department of Earth & Environmental Sciences, Division of Earth Environmental System SciencePukyong National UniversityBusanSouth Korea

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