How a mesoscale cyclonic vortex over Sahara leads to a dust outbreak in South-western Iberia

Couto FT, Cardoso EHC, Costa MJ, Salgado R, Guerrero-Rascado JL, Salgueiro V (2021) The study focused on an exceptional desert dust outbreak episode, in particular on the role of atmospheric circulation transporting high amounts of dust toward Portugal in February 2017. In order to assess the atmospheric conditions behind the mineral dust layer observed in […]

Guidance for the Integrated Use of Hydrological, Geochemical, and Isotopic Tools in Mining Operations

Wolkersdorfer, C., Nordstrom, D.K., Beckie, R.D. et al.  This paper summarizes international state-of-the-art applications and opportunities for employing and deploying hydrological, geochemical, and isotopic tools in an integrated manner for investigations of mining operations. It is intended to aid formulation of more integrated approaches for evaluating the overall sustainability of mining projects. The focus is particularly […]

Design of a Multipoint Cost-Effective Optical Instrument for Continuous In-Situ Monitoring of Turbidity and Sediment

Matos, T.; Faria, C.L.; Martins, M.S.; Henriques, R.; Gomes, P.A.; Goncalves, L.M.  A cost-effective optical instrument for continuous in-situ monitoring applications is presented. With a production cost in raw materials of 38 €, a power consumption of 300 A in sleep mode and 100 mA in active mode (5 ms reading), and a capacity to […]

A Discussion on the Quantification and Classification of Geodiversity Indices Based on GIS Methodological Tests

Gonçalves, J., Mansur, K., Santos, D. et al.  Quantitative assessment methods are attaining special attention in geodiversity research. Procedures to map geodiversity indices have been proposed by several authors though there is no consensus on how to best apply and replicate them in diverse areas. A contribution to the quantitative mapping of geodiversity using GIS tools […]

Improved ECMWF forecasts of direct normal irradiance: A tool for better operational strategies in concentrating solar power plants

Francisco M. Lopes, Ricardo Conceição, Hugo G. Silva, Rui Salgado, Manuel Collares-Pereira To contribute for improved operational strategies of concentrating solar power plants with accurate forecasts of direct normal irradiance, this work describes the use of several post-processing methods on numerical weather prediction. Focus is given to a multivariate regression model that uses measured irradiance […]

Pressure drops, heat transfer coefficient, costs and power block design for direct storage parabolic trough power plants running molten salts

Telma Lopes, Thomas Fasquelle, Hugo G. Silva Direct circulation of molten salts in the solar field of parabolic trough solar power plants may be a possible breakthrough to decrease their levelized cost of electricity. While prototypes are being erected around the world, this study addresses the main concerns and changes that are related to the […]

Numerical study of the seasonal thermal and gas regimes of the largest artificial reservoir in western Europe using the LAKE 2.0 model

Maksim Iakunin, Victor Stepanenko, Rui Salgado, Miguel Potes, Alexandra Penha, Maria Helena Novais, and Gonçalo Rodrigues The Alqueva reservoir (southeast of Portugal) is the largest artificial lake in western Europe and a strategic freshwater supply in the region. The reservoir is of scientific interest in terms of monitoring and maintaining the quality and quantity of water […]

Semi-Automatization of Support Vector Machines to Map Lithium (Li) Bearing Pegmatites

Joana Cardoso-Fernandes, Ana C. Teodoro, Alexandre Lima, Encarnación Roda-Robles Machine learning (ML) algorithms have shown great performance in geological remote sensing applications. The study area of this work was the Fregeneda–Almendra region (Spain–Portugal) where the support vector machine (SVM) was employed. Lithium (Li)-pegmatite exploration using satellite data presents some challenges since pegmatites are, by nature, […]

The Esmolfe-Matança granite (Penalva do Castelo, central Portugal): A keystone to understand the ascent and emplacement of magmas under low tectonic stress

Ana Gonçalves, Helena Sant’ovaia, Maria dos Anjos Ribeiro, Fernando Noronha The Esmolfe–Matança ilmenite-type granite is analyzed using petrography, microstructures, anisotropy of magnetic susceptibility and microfracturing. The granite occurs in two separated bodies outcropping in distinct villages, Esmolfe and Matança, which are located in the termination of the Juzbado-Penalva do Castelo (JPCSZ) and Dúrico-Beirão (DBSZ) shear […]

Geochemical Signature and Magnetic Fabric of Capinha Massif (Fundão, Central Portugal): Genesis, Emplacement and Relation with W–Sn Mineralizations

Ana Gonçalves, Helena Sant’Ovaia, Fernando Noronha The Fundão–Serra da Estrela–Capinha (FSEC) region is characterized by peraluminous to metaluminous Variscan granites intrusive in a complex and thick metasedimentary sequence. This work seeks to characterize the Capinha granite (CG), understand its spatial and genetic relationship with the host Peroviseu–Seia (PS), Belmonte–Covilhã (BC) and Fáguas granites, and evaluate […]