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Geoquímica de sedimentos lacustres em sistemas com elevadas taxas de sedimentação por eventos climáticos extremos: estudos de caso na República Dominicana

2020-08Journal article Open access
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dc.contributor.authorFonseca Araújo, Joana
dc.contributor.authorNogueira, Pedro
dc.contributor.authorFonseca, Rita
dc.contributor.authorPinho, C.
dc.contributor.authorAraujo, A.
dc.date.accessioned2021-07-30T13:51:38Z
dc.date.available2021-07-30T13:51:38Z
dc.date.issued2020-08
dc.description.abstractResumo: As condições climáticas da República Dominicana são propícias à ocorrência de elevadas taxas de erosão e, consequentemente, a elevadas taxas de sedimentação, prejudicando por isso o potencial de armazenamento de água e de produção de energia eléctrica das barragens. Neste estudo, foram abordadas duas barragens, Tavera e Sabana Yegua, nas quais se amostraram os solos das respectivas bacias de drenagem, bem como os sedimentos de fundo. Recorrendo à análise da química total através de ICP-OES, bem como à análise textural e elementar, pretende-se realizar uma caracterização geoquímica quanto aos elementos maiores e em traço, bem como a avaliação da proveniência dos sedimentos, de modo a determinar a real influência de cada sub-bacia de drenagem no processo de sedimentação das barragens.pt_PT
dc.description.abstractAbstract: The climate of Dominican Republic is a humid tropical climate, with periodic annual occurrence of hurricanes. The climate, in association with a rugged topography, represent factors that enhance high erosion rates and, consequently, high sedimentation rates. This sedimentation excess contributes to the silting of the reservoirs, and are responsible for the reduction of the hydroelectric power production and of the potential of water storage. The aim of our study is to do a geochemical characterization of major and trace elements, including the REE, of the bottom sediments of two chosen dams, and to evaluate their sources through a comparative study with the soils of the drainage basins. It is also intended to determine the real influence of each drainage sub-basin in the sedimentation process of these systems. The two selected dams are Tavera and Sabana Yegua, which are limited by the central mountain range, being Tavera at North and Sabana Yegua at South. The sediment sampling was carried out in two seasonal periods, at representative locations of the different hydrodynamic conditions of each reservoir, through dredging of the surface layer. Soil sampling was performed in a single campaign, in several sectors of the respective drainage basins. The sampling was followed by analysis of major and trace elements by ICP-OES, organic carbon and sulfur by an elemental analyzer, and textural characteristics of both, sediments and soils. The achieved geochemical data allowed a comparative study between the sediments of the dams and the soils of the drainage basins, through multielementar correlation analysis relatively to the contents of major and trace elements and to the granulometric fractions, in order to identify the sediments provenance. Although lithotypes are very similar in both basins (characterized by volcano-sedimentary rocks of arch-island origin, tonalites, sandstones, conglomerates and intermediate volcanic rocks), the main difference between the two basins is that Sabana Yegua reservoir and a part of its tributaries are inserted into sedimentary, detrital and carbonate formations. The geochemical data is very homogeneous throughout the whole area of the reservoirs, allowing to verify the occurrence of uniform sedimentation in both cases, which reflects a high hydrodynamism. The soils show a higher heterogeneity as result of their sampling had been done at different sectors of those basins. This study is in a preliminary state, in a near future we are going to perform the same geochemical analysis in rocks, and analysis of REE in sediments, soils and rocks.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationAraújo et al. 2020, ‘Geoquímica de sedimentos lacustres em sistemas com elevadas taxas de sedimentação por eventos climáticos extremos: estudos de caso na República Dominicana’, Comunicações Geológicas, vol. 107, nº 1 (especial), pp. 7-9.pt_PT
dc.identifier.doi10.34637/C77J-0319
dc.identifier.issn0873-948X
dc.identifier.urihttp://hdl.handle.net/10400.9/3573
dc.language.isoporpt_PT
dc.peerreviewedyespt_PT
dc.publisherLNEG - Laboratório Nacional de Energia e Geologiapt_PT
dc.relationFONDOCyT (Ministério da Educação Superior, Ciência e Tecnologia da República Dominicana – MESCyT) através do projecto "Aprovechamiento de los sedimentos de los embalses como nutrientes para la fertilización de suelos agrícolas en la República Dominicana”.pt_PT
dc.relationICT, através do contrato com a FCT (Fundação para a Ciência e Tecnologia).pt_PT
dc.relationFundo Europeu para o Desenvolvimento Regional através do COMPETE 2020 – Programa Operacional de Competitividade e Internacionalização (POCI).pt_PT
dc.relationINALENTEJO – QREN 2007-2013 (projectos ALENT-07-0262-FEDER-001867, ALENT-07-02622- FEDER-001876).pt_PT
dc.relation.publisherversionhttps://www.lneg.pt/wp-content/uploads/2020/09/01_Araujo-et-al.pdfpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectBarragenspt_PT
dc.subjectGeoquímicapt_PT
dc.subjectSedimentospt_PT
dc.subjectDamspt_PT
dc.subjectGeochemistrypt_PT
dc.subjectSedimentspt_PT
dc.titleGeoquímica de sedimentos lacustres em sistemas com elevadas taxas de sedimentação por eventos climáticos extremos: estudos de caso na República Dominicanapt_PT
dc.title.alternativeGeochemistry of lacustrine sediments in systems with high sedimentation rates due to extreme climatic events: case studies in the Dominican Republicpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceAmadorapt_PT
oaire.citation.endPage9pt_PT
oaire.citation.issueFascículo especial I
oaire.citation.startPage7pt_PT
oaire.citation.titleComunicações Geológicaspt_PT
oaire.citation.volume107pt_PT
person.familyNameFonseca Araújo
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person.familyNamePinho
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person.givenNameJoana
person.givenNamePedro
person.givenNameRita
person.givenNameAna Catarina
person.givenNameAlexandre
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person.identifier.orcid0000-0002-6389-2822
person.identifier.orcid0000-0002-0511-3165
person.identifier.orcid0000-0003-0184-2675
person.identifier.ridI-9678-2017
person.identifier.ridO-4798-2015
person.identifier.scopus-author-id12793083600
person.identifier.scopus-author-id18634176400
person.identifier.scopus-author-id10538888700
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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Volume 107 (2020) Fascículo Especial I (X Congresso Nacional de Geologia)