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

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 s...

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Veröffentlicht in:Environmental science and pollution research international 2020-03, Vol.27 (9), p.10087-10102
Hauptverfasser: Chung, Sang Yong, Rajendran, Rajesh, Senapathi, Venkatramanan, Sekar, Selvam, Ranganathan, Paramasivam Chellamuthu, Oh, Yun Yeong, Elzain, Hussam Eldin
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container_end_page 10102
container_issue 9
container_start_page 10087
container_title Environmental science and pollution research international
container_volume 27
creator Chung, Sang Yong
Rajendran, Rajesh
Senapathi, Venkatramanan
Sekar, Selvam
Ranganathan, Paramasivam Chellamuthu
Oh, Yun Yeong
Elzain, Hussam Eldin
description 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 CaSO 4 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.
doi_str_mv 10.1007/s11356-019-07451-6
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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. 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and characteristics of hydrogeochemical variations between unconfined and confined aquifer systems: a case study of the Nakdong River Basin in Busan City, Korea</title><author>Chung, Sang Yong ; Rajendran, Rajesh ; Senapathi, Venkatramanan ; Sekar, Selvam ; Ranganathan, Paramasivam Chellamuthu ; Oh, Yun Yeong ; Elzain, Hussam Eldin</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c445t-c243499f7c8cce431f8e40d4d644b6b542d3bf165f37cc0867835248a14dc3fb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Acetylcholinesterase</topic><topic>Aluminum</topic><topic>Aquatic Pollution</topic><topic>Aquifer systems</topic><topic>Aquifers</topic><topic>Atmospheric Protection/Air Quality Control/Air Pollution</topic><topic>Boreholes</topic><topic>Calcite</topic><topic>carbonates</topic><topic>case studies</topic><topic>Chemical analysis</topic><topic>clay</topic><topic>Cluster 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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 CaSO 4 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. 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identifier ISSN: 0944-1344
ispartof Environmental science and pollution research international, 2020-03, Vol.27 (9), p.10087-10102
issn 0944-1344
1614-7499
language eng
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source SpringerLink (Online service)
subjects Acetylcholinesterase
Aluminum
Aquatic Pollution
Aquifer systems
Aquifers
Atmospheric Protection/Air Quality Control/Air Pollution
Boreholes
Calcite
carbonates
case studies
Chemical analysis
clay
Cluster analysis
confined aquifer
Confined aquifers
Confined groundwater
Cretaceous
Cretaceous period
Dolomite
Earth and Environmental Science
Ecosystem structure
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Evaporation
factor analysis
Fresh water
Freshwater ecosystems
Fungicides
Geochemistry
Groundwater
Heavy metals
hydrogeochemistry
Insecticides
Invertebrates
Ion exchange
iron
Korean Peninsula
Oxidation
Pesticides
Rainy season
Research Article
Risk assessment
River basins
Rivers
Rocks
Saturation index
Seawater
Shrimps
Sodium chloride
Species
Toxicity
unconfined aquifer
Unconfined aquifers
Unconformity
Waste Water Technology
Water analysis
Water Management
Water Pollution Control
Water sampling
watersheds
Weathering
wet season
γ-Aminobutyric acid
title Processes and characteristics of hydrogeochemical variations between unconfined and confined aquifer systems: a case study of the Nakdong River Basin in Busan City, Korea
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