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Article: Origin of groundwater salinity and hydrogeochemical processes in the confined Quaternary aquifer of the Pearl River Delta, China

TitleOrigin of groundwater salinity and hydrogeochemical processes in the confined Quaternary aquifer of the Pearl River Delta, China
Authors
KeywordsBrackish aquifers
C analysis
Coastal aquifers
Coastal area
Confined aquifers
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrol
Citation
Journal of Hydrology, 2012, v. 438-439, p. 112-124 How to Cite?
AbstractThe Pearl River Delta (PRD), located in the coastal area of South China, contains a large confined Quaternary aquifer. This aquifer has been identified to have high concentrations of total dissolved solids-ranging from 1g/l in the inland area to 26.8g/l near the southeast shoreline. This work aims to investigate the origin of groundwater salinity and the major hydrogeochemical processes controlling the groundwater evolution in the confined basal aquifer of the PRD. A total of 40 boreholes were drilled in the PRD during 2007-2009, and groundwater samples were collected for major ion (Ca2+,Mg2+,Na+,K+,NH4+,Cl-,SO42- and HCO3-) and isotope (δ 18O, δ 2H, 3H, δ 13C and 14C) analyses. These analyses demonstrate that groundwater in the confined basal aquifer is recharged by local rainwater and seawater, and seawater is the major salinity source for groundwater. The contribution of seawater varies from less than 1% in the inland areas to 74% near the shoreline. SO42- reduction and methanogenesis occur in this reducing confined aquifer. The results of ion exchange show that Mg 2+ exchanges mainly with the NH4+ ion, which is derived from the mineralization of sedimentary organic matter. Ion exchange between Na + and Ca 2+ and groundwater facies suggest that the brackish aquifer in the northwest inland area is undergoing freshening. 3H analysis suggests that infiltrated rainwater is younger than seawater. 14C analysis indicates that the seawater most likely infiltrated into the confined basal aquifer during the Holocene transgression period. © 2012 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/159504
ISSN
2015 Impact Factor: 3.043
2015 SCImago Journal Rankings: 1.743
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, Yen_US
dc.contributor.authorJiao, JJen_US
dc.date.accessioned2012-08-16T05:51:08Z-
dc.date.available2012-08-16T05:51:08Z-
dc.date.issued2012en_US
dc.identifier.citationJournal of Hydrology, 2012, v. 438-439, p. 112-124en_US
dc.identifier.issn0022-1694-
dc.identifier.urihttp://hdl.handle.net/10722/159504-
dc.description.abstractThe Pearl River Delta (PRD), located in the coastal area of South China, contains a large confined Quaternary aquifer. This aquifer has been identified to have high concentrations of total dissolved solids-ranging from 1g/l in the inland area to 26.8g/l near the southeast shoreline. This work aims to investigate the origin of groundwater salinity and the major hydrogeochemical processes controlling the groundwater evolution in the confined basal aquifer of the PRD. A total of 40 boreholes were drilled in the PRD during 2007-2009, and groundwater samples were collected for major ion (Ca2+,Mg2+,Na+,K+,NH4+,Cl-,SO42- and HCO3-) and isotope (δ 18O, δ 2H, 3H, δ 13C and 14C) analyses. These analyses demonstrate that groundwater in the confined basal aquifer is recharged by local rainwater and seawater, and seawater is the major salinity source for groundwater. The contribution of seawater varies from less than 1% in the inland areas to 74% near the shoreline. SO42- reduction and methanogenesis occur in this reducing confined aquifer. The results of ion exchange show that Mg 2+ exchanges mainly with the NH4+ ion, which is derived from the mineralization of sedimentary organic matter. Ion exchange between Na + and Ca 2+ and groundwater facies suggest that the brackish aquifer in the northwest inland area is undergoing freshening. 3H analysis suggests that infiltrated rainwater is younger than seawater. 14C analysis indicates that the seawater most likely infiltrated into the confined basal aquifer during the Holocene transgression period. © 2012 Elsevier B.V.-
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jhydrolen_US
dc.relation.ispartofJournal of Hydrologyen_US
dc.subjectBrackish aquifers-
dc.subjectC analysis-
dc.subjectCoastal aquifers-
dc.subjectCoastal area-
dc.subjectConfined aquifers-
dc.titleOrigin of groundwater salinity and hydrogeochemical processes in the confined Quaternary aquifer of the Pearl River Delta, Chinaen_US
dc.typeArticleen_US
dc.identifier.emailWang, Y: wangya@hku.hken_US
dc.identifier.emailJiao, JJ: jjiao@hku.hken_US
dc.identifier.authorityJiao, JJJ=rp00712en_US
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jhydrol.2012.03.008-
dc.identifier.scopuseid_2-s2.0-84860368194-
dc.identifier.hkuros205139en_US
dc.identifier.volume438-439en_US
dc.identifier.spage112en_US
dc.identifier.epage124en_US
dc.identifier.isiWOS:000304506600010-
dc.publisher.placeNetherlands-
dc.identifier.citeulike10618103-

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