Percorrer por autor "Marques, Jorge Espinha"
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- Delineating Groundwater Vulnerability and Protection Zone Mapping in Fractured Rock Masses: Focus on the DISCO IndexPublication . Meerkhan, Helen; Teixeira, José; Marques, Jorge Espinha; Afonso, Maria José; Chaminé, Helder I.Hard-rock catchments are considered to be source of valuable water resources for water supply to inhabitants and ecosystems. The present work aims to develop a groundwater vulnerability approach in the Caldas da Cavaca hydromineral system (Aguiar da Beira, Central Portugal) in order to improve the hydrogeological conceptual site model. Different types of information were overlaid, generating several thematic maps to achieve an integrated framework of key sectors in the study site. Thus, a multi-technical approach was used, encompassing field and laboratory techniques, whereby different types of data were collected from fields such as geology, hydrogeology, applied geomorphology and geophysics and hydrogeomechanics, with the fundamental aim of applying the so-called DISCO index method. All of these techniques were successfully performed and an intrinsic groundwater vulnerability to contamination assessment, based on the multicriteria methodology of GOD-S, DRASTIC-Fm, SINTACS, SI and DISCO indexes, was delineated. Geographic Information Systems (GIS) provided the basis on which to organize and integrate the databases and to produce all the thematic maps. This multi-technical approach highlights the importance of groundwater vulnerability to contamination mapping as a tool to support hydrogeological conceptualization, contributing to improving the decision-making process regarding water resources management and sustainability.
- A preliminary hydrogeologic conceptual model of the Manteigas-Nave de Santo Antonio-Torre sector (Serra da Estrela Natural park, central Portugal)Publication . Marques, Jorge Espinha; Marques, José M.; Carreira, Paula M.; I. Chaminé, Helder; Fonseca, Paulo E.; Samper, Javier; Pisani, B.; Alvares, D.; Vieira, Gonçalo T.; Mora, Carla; Teixeira, José; Gomes, Alberto; Carvalho, José Martins; Borges, Frederico S.; Rocha, Fernando T.; Beleza, VitorinoThis work is strongly connected with one of the most crucial water research issues at the turn of the millennium “High Mountain Areas Hydrology” (UNESCO IHP-VI Programme). Special emphasis is dedicated to high mountains and their role and impact on surface water/groundwater interaction at Serra da Estrela region - Central Portugal, in order propose a preliminary hydrogeologic conceptual model of the Manteigas - Nave de Santo Antonio - Torre sector, contributing to i) increase knowledge on recharge and discharge processes in this high mountain area and ii) assess the role of snowmelt as a source of groundwater resources, with the aid of coupled isotopic and geochemical techniques. The isotopic signatures of Caldas de Manteigas thermomineral waters combined with the i) morphostructural data and ii) isotopic composition of shallow groundwater and precipitation samples, made it possible to identify possible recharge areas, which should be located at altitude sites above 1500 m a.s.l.. The recharge altitudes are similar to those of Nave de Santo Antonio area which is directly located on the Braganca-Vilarica-Manteigas fault zone. This tectonic structure should play an important role in groundwater recharge and circulation towards the discharge zone at the Spas.