Geochemical and Isotopic Marks for Tracing Groundwater Salinization: Santiago Island, Republic of Cape Verde, Case Study

  • Paula M. CarreiraEmail author
  • António Lobo de Pina
  • Alberto Mota Gomes
  • José Manuel Marques
  • Fernando Monteiro Santos
Conference paper
Part of the Advances in Science, Technology & Innovation book series (ASTI)


In Santiago Island, the overexploitation of coastal aquifers and pollution are among the main problems related to groundwater resources assessment and management. The national water authorities are dealing with brackish groundwater for agriculture and human supply in numerous parts of the Island, as it is the only type of water available. Solutes and environmental isotope obtained in different aquifer systems were used in the identification/sources of groundwater resources degradation. Chemical and isotope analyses were carried out in groundwater samples in order to understand the role of anthropogenic activities and the main origin of salts in the groundwater units. The results obtained indicate water-rock interaction mechanisms as the major process responsible for the groundwater quality (mainly Ca–HCO3-type), reflecting the lithological composition of the Island’s geological formations. The geochemistry, together with the isotopic data, gives essential information on groundwater recharge, as well as on the identification of salinization mechanisms (e.g., seawater intrusion, salt dissolution, and marine aerosols). The isotopic pattern presented by part of the groundwater samples can be related to direct infiltration of irrigation waters undergoing significant evaporation, during the dry periods. Carbon-14 determinations (six boreholes) indicate an apparent groundwater ages between 1.3 and 3.1 ka BP.


Semi-arid region Stable isotopes 14C groundwater dating Salinization origin Republic of Cape Verde 



This work was developed in the scope of the project HYDROARID (POCI/CTE/GEX/55399/2004) funded by FCT and FEDER. C2TN/IST author acknowledge the FCT support through the UID/Multi/04349/2013 project; CERENA/IST acknowledge the FCT support through the UID/ECI/04028/2013 project.


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© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Paula M. Carreira
    • 1
    Email author
  • António Lobo de Pina
    • 2
  • Alberto Mota Gomes
    • 2
  • José Manuel Marques
    • 3
  • Fernando Monteiro Santos
    • 4
  1. 1.Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico, (C2TN/IST), Universidade de LisboaBobadela LRSPortugal
  2. 2.Faculdade de Ciências e TecnologiaUniversidade de Cabo VerdePraia, SantiagoRepublic of Cabo Verde
  3. 3.Centro de Recursos Naturais e Ambiente, Instituto Superior Tecnico (CERENA/IST), Universidade de LisboaLisbonPortugal
  4. 4.Universidade de Lisboa - DEGGE-IDLLisbonPortugal

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