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Defining the dynamics of groundwater in Serra da Estrela Mountain area, central Portugal: an isotopic and hydrogeochemical approach |
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| Authors: | Paula M Carreira Jos?? M Marques Jorge Espinha Marques Helder I Chamin?? Paulo E Fonseca Fernando Monteiro Santos Rui M Moura Jos?? M Carvalho |
| Institution: | 1. Instituto Tecnológico e Nuclear (ITN), Estrada Nacional No. 10, 2686-953, Sacavém, Portugal 2. Centro de Petrologia e Geoquímica (CEPGIST), Instituto Superior Técnico (IST), Av. Rovisco Pais, 1049-001, Lisboa, Portugal 3. Centro de Geologia da Universidade do Porto (CGUP), Departamento de Geociências, Ambiente e Ordenamento do Território, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007, Porto, Portugal 4. Laboratório de Cartografia e Geologia Aplicada, Departamento de Engenharia Geotécnica, Instituto Superior de Engenharia do Porto, Rua do Dr. António Bernardino de Almeida, 431, 4200-072, Porto, Portugal 5. Centro GeoBioTec da Universidade de Aveiro, Campo Universitário de Santiago, 3810-193, Aveiro, Portugal 6. Centro de Geologia da Faculdade de Ciências da Universidade de Lisboa (CGUL), Edifício C6, Campo Grande, 1749-016, Lisboa, Portugal 7. Universidade de Lisboa ??IDL, Edifício C8, Campo Grande, 1749-016, Lisboa, Portugal |
| Abstract: | In a multidisciplinary approach, geological, geomorphologic, structural, hydrogeochemical and isotopic surveys were conducted on the Serra da Estrela groundwater system (central Portugal) in order to establish/develop a conceptual circulation model of the Caldas de Manteigas thermomineral system. A detailed study of the isotopic and geochemical composition of surface waters (e.g. Zêzere River), shallow groundwaters (cold dilute springs), and thermomineral waters was carried out to characterize the distribution of isotopes in waters of this mountainous region, and to determine the origin and possible recharge locations of the thermomineral system. Special attention was dedicated to isotopic tracers and their role in the definition of the thermomineral waters??conceptual model, considering: (1) the δ18O fractionation gradient; (2) the mean isotopic composition of the thermomineral waters in the region; and (3) the estimation of snowmelt contribution as a source of groundwater recharge at Serra da Estrela. The recharge of the thermomineral aquifer takes place on the more permeable zones of the granitic massif, associated with the main tectonic structures, whereas the recharge of the shallow aquifers seems to take place mostly in the plateaus, although another part of the recharge may occur in the slopes of the Zêzere River valley. |
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