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Integrated MASW and ERT Imaging for Geological Definition of an Unconfined Alluvial Aquifer Sustaining a Coastal Groundwater-Dependent Ecosystem in Southwest Portugal

2020Journal article Open access
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dc.contributor.authorPaz, Maria Catarina
dc.contributor.authorAlcalá, Francisco Javier
dc.contributor.authorMedeiros, Ana
dc.contributor.authorMartínez-Pagán, Pedro
dc.contributor.authorPérez-Cuevas, Jaruselsky
dc.contributor.authorRibeiro, Luís
dc.date.accessioned2021-04-07T11:20:13Z
dc.date.available2021-04-07T11:20:13Z
dc.date.issued2020
dc.description.abstractThis paper integrates multichannel analysis of surface waves (MASW) and time-lapse electrical resistivity tomography (ERT) to define aquifer geometry and identify transient groundwater features of the Cascalheira Stream Basin Holocene alluvial aquifer (aquifer H), which contributes to the Santo André Lagoon, part of a coastal groundwater-dependent ecosystem (GDE), located in southwest Portugal. MASW measures shear-wave velocity (VS), allowing one to obtain steady geological models of the subsurface, and ERT measures subsurface electrical resistivity (ER), being subjected to ambient changes. MASW enables disambiguation of geological structures in low ER environments, such as coastal areas. This research covered one natural year and involved one MASW campaign, four ERT campaigns, and additional geological field surveys and groundwater monitoring to assist interpretation of results. In the area, the conjugate NW–SE and NE–SW strike-slip fault systems determine compartmentalization of geological structures and subsequent accommodation space for Holocene sedimentation. MASW and ERT surveys show how the NW–SE system deepens these structures toward the coast, whereas the NE–SW system generates small horsts and grabens, being one of these occupied by aquifer H. From upstream to downstream, aquifer H thickness and width increase from 10 m to 12 m and from 140 m to 240 m, respectively. Performance of VS and ER models was satisfactory, with a normalized error of the VR and ER models in the 0.01–0.09 range, meaning that a quantitative quota of uncertainty can be segregated from the overall uncertainty of groundwater models without substantially affecting its simulations accuracy. This methodology seeks to improve the design of shallow groundwater research in GDE preservation policies.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPaz, M.C., Alcalá, F.J., Medeiros, A., Martínez-Pagán, P., Pérez-Cuevas, J. & Ribeiro, L. (2020). Integrated MASW and ERT imaging for geological definition of an unconfined alluvial aquifer sustaining a coastal groundwater-dependent ecosystem in southwest Portugal. Applied Sciences 10(17), 5905.pt_PT
dc.identifier.doi10.3390/app10175905pt_PT
dc.identifier.eissn2076-3417
dc.identifier.urihttp://hdl.handle.net/10400.26/36132
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationAPLICAÇÃO DE TÉCNICAS GEOFÍSICAS P/A CARACTERIZAÇÃO DE ECOSSISTEMAS DEPENDENTES DE ÁGUAS SUBTERRÂNEAS
dc.relationModelling scenarios for aquifer exploitation in coastal areas: effects on biodiversity of lagoons and respective stream systems as groundwater-dependent ecosystems - GroundScene
dc.subjectMultichannel analysis of surface wavespt_PT
dc.subjectElectrical resistivity tomographypt_PT
dc.subjectTime-lapse inversionpt_PT
dc.subjectAquifer geometrypt_PT
dc.subjectGroundwater-dependent ecosystempt_PT
dc.subjectSanto André Lagoonpt_PT
dc.subjectPortugalpt_PT
dc.titleIntegrated MASW and ERT Imaging for Geological Definition of an Unconfined Alluvial Aquifer Sustaining a Coastal Groundwater-Dependent Ecosystem in Southwest Portugalpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleAPLICAÇÃO DE TÉCNICAS GEOFÍSICAS P/A CARACTERIZAÇÃO DE ECOSSISTEMAS DEPENDENTES DE ÁGUAS SUBTERRÂNEAS
oaire.awardTitleModelling scenarios for aquifer exploitation in coastal areas: effects on biodiversity of lagoons and respective stream systems as groundwater-dependent ecosystems - GroundScene
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F75327%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FAAC-AMB%2F104639%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCLI%2F72585%2F2006/PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
person.familyNameCustódio da Paz
person.givenNameMaria Catarina
person.identifier.ciencia-id3B1E-D7FD-6BB8
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication.latestForDiscovery1418ab55-2deb-4693-9a61-6ff733ac06f9
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