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Water prospection in volcanic islands by Time Domain Electromagnetic (TDEM) surveying: The case study of the islands of Fogo and Santo Antão in Cape Verde

2016-11Artigo científico Acesso aberto
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dc.contributor.authorMartínez-Moreno, F.J.
dc.contributor.authorMonteiro Santos, Fernando Acácio
dc.contributor.authorMadeira, J.
dc.contributor.authorBernardo, I.
dc.contributor.authorSoares, A.
dc.contributor.authorEsteves, M.
dc.contributor.authorAdão, F.
dc.date.accessioned2022-03-30T13:45:38Z
dc.date.available2022-03-30T13:45:38Z
dc.date.issued2016-11
dc.description.abstractWater demand in islands, focused in agriculture, domestic use and tourism, is usually supplied by groundwater. Thus the information about groundwater distribution is an important issue in islands water resources management. Time Domain Electromagnetic (TDEM) provides underground resistivity distribution at greater depths and is of easier application than other methods. In this study TDEM technique was used for groundwater prospection in two volcanic islands with water supply problems, the islands of Fogo and Santo Antão in the Republic of Cape Verde. The 10 islands of Cape Verde Archipelago, located off the coast of Senegal (W Africa), present a semi-arid climate and thus suffer from irregular and scarce precipitation. In the Island of Fogo 26 TDEM soundings, presenting an area distribution, were performed on the SW flank of the volcanic edifice. These allowed obtaining a 3D model composed of 5 layers parallel to the topographic surface separated by 50 m depth down to − 250 m. The results indicate the presence of the water-table at a depth of 150 m in the lower ranges of the W flank of the island, and at > 200 m depth in the area above 250 m above sea level (a.s.l.). In the Island of Santo Antão 32 TDEM soundings, distributed along 5 linear profiles, were obtained on the north-eastern half of the island. The profiles are located in two regions exposed to different humidity conditions to the N and S of the main water divide. The northern flank receives the dominant trade winds first and most of the precipitation and, therefore, the water-table is shallower (~ 50 m depth) than in the S (~ 100 m depth). Our study demonstrates the applicability and usefulness of the TDEM method for groundwater prospection in high resistivity contexts such as in volcanic islands.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.jappgeo.2016.09.020pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/52095
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstitute Dom Luiz
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S092698511630310X?via%3Dihub#!pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectTime Domain Electromagneticspt_PT
dc.subjectCape Verdept_PT
dc.subjectVolcanic islandspt_PT
dc.subjectGroundwater resourcespt_PT
dc.titleWater prospection in volcanic islands by Time Domain Electromagnetic (TDEM) surveying: The case study of the islands of Fogo and Santo Antão in Cape Verdept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUID/GEO/50019/2013
oaire.awardTitleInstitute Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FGEO%2F50019%2F2013/PT
oaire.citation.endPage234pt_PT
oaire.citation.startPage226pt_PT
oaire.citation.titleJournal of Applied Geophysicspt_PT
oaire.citation.volume134pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMartínez Moreno
person.familyNamemonteiro santos
person.givenNameFrancisco José
person.givenNamefernando acácio
person.identifier2HoVqKAAAAAJ
person.identifier.ciencia-id9213-5508-F08B
person.identifier.ciencia-idC812-509E-03D3
person.identifier.orcid0000-0001-9005-7905
person.identifier.orcid0000-0001-8797-4008
person.identifier.scopus-author-id55776104800
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication1aede50c-75f0-4dc3-8cb6-2b2e5bcb5bb3
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