122 documents found, page 1 of 13
ROBIN: Reference observatory of basins for international hydrological climate c...
Turner, S.; Hannaford, J.; Barker, L. J.; Suman, G.; Killeen, A.; Armitage, R.; Chan, W.; et al.; Albuquerque, M.T.D.Human-induced warming is modifying the water cycle. Adaptation to posed threats requires an understanding of hydrological responses to climate variability. Whilst these can be computationally modelled, observed streamflow data is essential for constraining models, and understanding and quantifying emerging trends in the water cycle. To date, the identification of such trends at the global scale has been hindere...
Influence of tailings from a sulfide mine on drainage water quality, 60 years a...
Araújo, J.F.; Albuquerque, M.T.D.; Silva, N.; Silva, R. daThe GeoMatRe project aims to find low-cost solutions for water and sediment rehabilitation using raw geomaterials, in abandoned mines of the Iberian Pyritic Belt. One of our case studies is the Caveira mine in southwestern Portugal, where large piles of mining waste, containing significant amounts of metals, record the long history of its exploitation for gold (Au) and silver (Ag). After the exhaustion of its r...
Avaliação do nível de contaminação nos sedimentos de cursos de água do Sistema ...
Silva, R. da; Fonseca1, R.; Araújo, J. F.; Silva, N.; Albuquerque, M.T.D.O presente trabalho, inserido no Projeto GeoMatRe, visa o levantamento das condições mais atualizadas no que toca aos parâmetros físico-químicos numa mina de drenagem ácida. Uma situação crítica que ocorre na área mineira de Caveira, em Grândola, Portugal, abandonada desde a década de 60 do século passado. O objetivo passa por analisar as condições de contaminação de Elementos Potencialmente Tóxicos (EPT) nos s...
Stream sediments geochemistry on the Valongo anticlinal, northern Portugal: Ars...
Carvalho1, P.; Albuquerque, M.T.D.; Chambel, L.; Silva, M.; Rocha, F.The Valongo anticline is known for the occurrence of several Sb-Au and As-Au mineral deposits, many of which have been exploited since Roman times. The Sb-Au and As-Au deposits occur in brecciated quartz veins, predominantly trending NE-SW, NNW-SSE, and ENE-WSW, cutting Cambrian to Carboniferous formations. An 801-stream sediment campaign was conducted in this area. Factorial kriging was applied as an interpola...
Stream sediment pollution: a compositional baseline assessment
Albuquerque, M.T.D.; Fonseca, Rita; Araújo, Joana; Silva, Natália; Araújo, AntónioA high concentration of potentially toxic elements (PTEs) can affect ecosystem health in many ways. It is therefore essential that spatial trends in pollutants are assessed and monitored. Two questions must be addressed when quantifying pollution: how to define a non-polluted sample and how to reduce the problem’s dimensionality. A geochemical dataset is a composition of variables (chemical elements), where the...
Unpacking occupational health data in the service sector: from bayesian network...
Pazo, María; Boente, Carlos; Albuquerque, M.T.D.; Gerassis, Saki; Roque, Natália; Taboada, JavierThe health status of the service sector workforce is a significant unknown in the field of medical geography. While spatial epidemiology has made progress in predicting the relationship between human health and the environment, there are still important challenges that remain unsolved. The main issue lies in the inability to statistically determine and visually represent all spatial concepts, as there is a need...
Remote sensing for water quality monitoring - a case study for the Marateca res...
Alegria, C.M.M.; Albuquerque, M.T.D.Continuous monitoring of water resources is essential for ensuring sustainable urban water supply. Remote sensing techniques have proven to be valuable in monitoring certain qualitative parameters of water with optical characteristics. This survey was conducted in the Marateca reservoir located in central inland Portugal, after a major event that killed a considerable number of fish. The objectives of the study...
Nova metodologia para a construção de Índices Composicionais de Poluição em sol...
Albuquerque, M.T.D.; Boente, Carlos; Gallego, J.R.; Pawlowsky-Glahn, Vera; Egozcue, Juan JoséO complexo comportamento geoquímico de Elementos Potencialmente Tóxicos (EPT) em solos pode afetar severamente os ecossistemas e a saúde humana. No entanto, é necessário compreender primeiro o que se entende por um solo “limpo” para depois poder avaliar um solo “poluído “e correspondente grau de severidade associado. Tendo em conta que a composição química de um solo é composicional, os atributos variam juntos,...
Stream sediments as a repository of U, Th and As around abandoned uranium mines...
Carvalho, Paula; Antunes, I.M.H.R.; Albuquerque, M.T.D.; Santos, António; Cunha, Pedro ProençaThis work focuses on the study of water–sediment interaction around abandoned uranium mines with open-pit lakes and mine dumps. Nineteen water and eleven stream sediment samples were collected in the abandoned Barrôco D. Frango mine, central Portugal. The trace element distribution was compared with other abandoned uranium mines in Portugal and worldwide. Generally, U, Th, and As contents in the open-pit water ...
Unpacking occupational health data in the tertiary sector. From spatial cluster...
Pazo, María; Boente, Carlos; Albuquerque, M.T.D.; Roque, Natália; Gerassis, Saki; Taboada, JavierThe health status of the service sector workforce is a great unknown for medical geography. Despite the advances carried out by spatial epidemiology to predict spatial patterns of disease incidence, there are important challenges unsolved. In particular, the main issue resides in the ability to effectively simplify and visually represent the problem domain, given the need to cover very different service activit...