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Identifying seawater intrusion in coastal areas by means of 1D and quasi-2D joint inversion of TDEM and VES data

2017-09Journal article Open access
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dc.contributor.authorMartínez-Moreno, F.J.
dc.contributor.authorMonteiro Santos, Fernando Acácio
dc.contributor.authorBernardo, I.
dc.contributor.authorFarzamian, M.
dc.contributor.authorNascimento, C.
dc.contributor.authorFernandes, J.
dc.contributor.authorCasal, B.
dc.contributor.authorRibeiro, J.A.
dc.date.accessioned2022-03-30T11:14:52Z
dc.date.available2022-03-30T11:14:52Z
dc.date.issued2017-09
dc.description.abstractSeawater intrusion is an increasingly widespread problem in coastal aquifers caused by climate changes –sea-level rise, extreme phenomena like flooding and droughts– and groundwater depletion near to the coastline. To evaluate and mitigate the environmental risks of this phenomenon it is necessary to characterize the coastal aquifer and the salt intrusion. Geophysical methods are the most appropriate tool to address these researches. Among all geophysical techniques, electrical methods are able to detect seawater intrusions due to the high resistivity contrast between saltwater, freshwater and geological layers. The combination of two or more geophysical methods is recommended and they are more efficient when both data are inverted jointly because the final model encompasses the physical properties measured for each methods. In this investigation, joint inversion of vertical electric and time domain soundings has been performed to examine seawater intrusion in an area within the Ferragudo-Albufeira aquifer system (Algarve, South of Portugal). For this purpose two profiles combining electrical resistivity tomography (ERT) and time domain electromagnetic (TDEM) methods were measured and the results were compared with the information obtained from exploration drilling. Three different inversions have been carried out: single inversion of the ERT and TDEM data, 1D joint inversion and quasi-2D joint inversion. Single inversion results identify seawater intrusion, although the sedimentary layers detected in exploration drilling were not well differentiated. The models obtained with 1D joint inversion improve the previous inversion due to better detection of sedimentary layer and the seawater intrusion appear to be better defined. Finally, the quasi-2D joint inversion reveals a more realistic shape of the seawater intrusion and it is able to distinguish more sedimentary layers recognised in the exploration drilling. This study demonstrates that the quasi-2D joint inversion improves the previous inversions methods making it a powerful tool applicable to different research areas.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.jhydrol.2017.07.026pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/52090
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationInstitute Dom Luiz
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0022169417304778?via%3Dihub#!pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectCoastal aquiferspt_PT
dc.subjectSeawater intrusionpt_PT
dc.subjectDrilling explorationpt_PT
dc.titleIdentifying seawater intrusion in coastal areas by means of 1D and quasi-2D joint inversion of TDEM and VES datapt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FGEO%2F50019%2F2013/PT
oaire.citation.endPage619pt_PT
oaire.citation.startPage609pt_PT
oaire.citation.titleJournal of Hydrologypt_PT
oaire.citation.volume552pt_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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