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Application of Time-Domain Electromagnetic Method in Investigating Saltwater Intrusion of Santiago Island (Cape Verde)

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Abstract

Santiago Island, the biggest and most populated island of the Cape Verde Republic, is characterised by limited surface waters and strong dependence on groundwater sources as the primary source of natural water supply for extensive agricultural activity and human use. However, as a consequence of the scarce precipitation and high evaporation as well as the intense overexploitation of the groundwater resources, the freshwater management is also in a delicate balance with saltwater at coastal areas. The time-domain electromagnetic (TDEM) method is used to locate the extent of saltwater intrusion in four important agricultural regions in Santiago Island; São Domingos, Santa Cruz, São Miguel, and Tarrafal. The application of this method in Santiago Island proves it to be a successful tool in imaging the fresh/saltwater interface location. Depths to the saline zones and extensions of saline water are mapped along eight TDEM profiles.

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Acknowledgements

This work was developed in the scope of HYDROARID (POCI/CTE/GEX/55399/2004) project funded by Fundação para a Ciência e Tecnologia (FCT) and FEDER. Publication is supported by the project FCTUID/GEO/50019/2013–Instituto Dom Luiz.

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Authors and Affiliations

  1. Universidade de Lisboa, IDL, Campo Grande ed. C8, 1749-016, Lisbon, Portugal

    Rui Gonçalves, Mohammad Farzamian, Fernando A. Monteiro Santos & Eugénio P. Almeida

  2. Instituto Politécnico de Tomar, 2300-313, Tomar, Portugal

    Rui Gonçalves & Eugénio P. Almeida

  3. Laboratório Nacional de Energia e Geologia, Amadora, Portugal

    Patrícia Represas

  4. Universidade de Cabo Verde, Praia, Cape Verde

    A. Mota Gomes & A. F. Lobo de Pina

Authors
  1. Rui Gonçalves
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  2. Mohammad Farzamian
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  3. Fernando A. Monteiro Santos
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  4. Patrícia Represas
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  5. A. Mota Gomes
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  6. A. F. Lobo de Pina
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  7. Eugénio P. Almeida
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Correspondence to Mohammad Farzamian.

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Gonçalves, R., Farzamian, M., Monteiro Santos, F.A. et al. Application of Time-Domain Electromagnetic Method in Investigating Saltwater Intrusion of Santiago Island (Cape Verde). Pure Appl. Geophys. 174, 4171–4182 (2017). https://doi.org/10.1007/s00024-017-1642-7

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  • DOI: https://doi.org/10.1007/s00024-017-1642-7

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