Jorge Pamplona - Academia.edu (original) (raw)

Papers by Jorge Pamplona

Journal of Environmental Management

$Research paper thumbnail of Instabilidade de vertente em maciço granítico fracturado e alterado (Terras de Bouro, NW De Portugal)$

Geotecnia, 2011

O presente trabalho incide sobre a instabilidade de uma vertente que surgiu na região granítica d... more O presente trabalho incide sobre a instabilidade de uma vertente que surgiu na região granítica da Serra do Gerês, na freguesia de Rio Caldo, concelho de Terras de Bouro (NW de Portugal), no Inverno de 2000 – 2001. O local é uma zona de falha preenchida por argila siltosa, pouco plástica, na qual a caulinite domina sobre a gibsite. Os solos residuais graníticos circundantes apresentam percentagens significativas de finos e teores elevados de minerais argilosos, nos quais a gibsite domina sobre a caulinite. A hipótese que se afigura como mais provável para explicar a instabilidade consiste num deslizamento composto sobre o plano de falha com uma outra componente curvilínea. Para o seu desencadeamento terá sido decisivo o grande volume de água infiltrada (2264 mm) e a diferença de características mecânicas entre a caixa de falha e os solos envolventes. Durante o período de estudo o local não apresentou sinais de movimentação. As medidas de remediação visam, essencialmente, a drenagem ...

Acid mine drainage represents an extreme environment with high concentrations of potentially toxi... more Acid mine drainage represents an extreme environment with high concentrations of potentially toxic elements and low pH values. These aquatic habitats are characterised by harsh conditions for biota, being dominated by acidophilic organisms. The study site, Sao Domingos mine, located in one of the largest metallogenetic provinces in the world, the Iberian Pyrite Belt, was closed without preventive measures. To identify the algae species and understand the relationships with abiotic parameters of the ecosystem, water and biological material were collected and analysed. Digital terrain models were obtained with an unmanned aerial vehicle for geomorphological and hydrologic characterisation of the mine degraded landscape. The results show two types of algal colours that seem to represent different degrees of photosynthetic activity. Optical and scanning electron microscopy revealed 14 taxa at the genus level, divided into eight classes. The genus Mougeotia is the most abundant multicell...

The process responsible for the genesis and the initial morphological evolution of shearband boud... more The process responsible for the genesis and the initial morphological evolution of shearband boudins is controlled by the buckling laws. In this model, the generation of boudins begins with folding of tabular competent veins of different thickness immersed in a less competent matrix. Veins thicker than a given critical value form initial asymmetric open folds that evolve by asymmetric antithetical rotation and later by an internal mass redistribution with translation along the interface vein-matrix. On the other side, the veins thinner than the critical value follow the folding process until it culminates with the coalescence and stacking of the folds. By this mechanism the critical thickness is reached and these bodies are prone to suffer a new phase of boudinage similar to that followed by the originally thicker veins. Therefore, all deformed tabular veins, embedded in a ductile matrix, converge to classical shearband boudin morphology, independently from their original thicknessL...

Wolkersdorfer, Ch.; Sartz, L.; Weber, A.; Burgess, J.; Tremblay, G. (Editors) Abstract e present ... more Wolkersdorfer, Ch.; Sartz, L.; Weber, A.; Burgess, J.; Tremblay, G. (Editors) Abstract e present study shows hydrochemistry of shallow groundwater from two wells planned to supply public fountains in the north of Portugal. One of the wells su ers higher impact by acid rock drainage due to mineral-water interaction in a host lithology richer in sul des. Dissolution of sulfate e orescences, in ltration and recharge, structural faults, and high porosity of the terrain control the evolution trends of water chemistry. e study concludes by noting the strong contamination, including by toxic elements (Al, Mn, Cd), making impossible to use the water for public supply as planned.

Wolkersdorfer, Ch.; Khayrulina, E.; Polyakova, S.; Bogush, A. (Editors) Abstract The geochemical ... more Wolkersdorfer, Ch.; Khayrulina, E.; Polyakova, S.; Bogush, A. (Editors) Abstract The geochemical evolution of acid mine drainage results in secondary minerals that play a key role in the environmental behavior of the mine wastes. The present work is focused on these newly formed minerals at the Penedono waste dump, characterized by fine grained tails with pyrite and arsenopyrite. Mineralogical study led to an inventory of secondary phases, comprising soluble sulfates, scorodite, and oxyhydroxysulfates. In addition, there is amorphous Fe, As rich-nanoprecipitates. Jarosite and scorodite are abundant minerals, acting as cement for encrusting tails in Fe and As-rich hardpans. These hard structures are relatively insoluble, retaining toxic elements, thereby contributing to natural attenuation of mining contamination associated with the sulphide wastes.

Geosciences

In regions under development and facing recurrent droughts, increasing the area of irrigated agri... more In regions under development and facing recurrent droughts, increasing the area of irrigated agriculture may create additional disruption in water resources management. The present study was focused on three river sub-basins with the highest agricultural intensity (S. Miguel, Ribeira Seca and S. Domingos) in Santiago Island (Cape Verde). Sets of wells were selected to evaluate the influence of salinization and agriculture practices on the hydrochemistry. This assessment was performed by using data from the bibliography (2003) and a recent campaign (2016). The water chemistry indicates lower mineralization in the S. Miguel sub-basin. Nitrates and nitrites, typically associated with diffuse pollution, are present in all sub-basins, but with varying patterns. Additionally, sodium chloride waters occur in all the three sub-basins, especially those closest to the coastline. In turn, a bicarbonate-magnesium facies was identified in S. Domingos, at the furthest point from the coast, indica...

Journal of Structural Geology

E3S Web of Conferences

The abandoned Jales mining area is a sulphide-rich deposit (Northeast of Portugal). Acid mine dra... more The abandoned Jales mining area is a sulphide-rich deposit (Northeast of Portugal). Acid mine drainage resulted from oxidation of sulphides is treated in a passive system with wetlands. The present work studies the thorium and uranium behaviour in the water and in the fine fractions of wetland soils throughout the passive treatment system. The evaluation of the efficiency of the all system was done determining metals concentration variation in the creek water upstream and downstream of the treated effluent discharge. The results point to higher efficiency to retain Th after summer than after winter. The opposite was found for uranium, which increases significantly in the creek water after summer and, in a lower extent, after winter. Also, Th and U have a tendency to increase in the fine fractions of the wetlands soils after summer, which can be explained by the longer water-soil contact/lower water dynamics. Nevertheless uranium has a much higher tendency to be in solution as reveal...

SDRP Journal of Earth Sciences & Environmental Studies

The supply of drinking water is one of the major concerns in semi-arid and arid climates, mainly ... more The supply of drinking water is one of the major concerns in semi-arid and arid climates, mainly in developing countries. The present study reviews the situation of the water supply in a West African coast country, the archipelago of Cape Verde, with focus on the most populous island (Santiago), regarding the rate of public coverage and the water quality. As main insights, the research indicates that at Santiago Island only 54% of the population has connection to the public network, while 24% uses wells, springs and other potentially non-potable sources. The region of São Domingos is one of the most critical, with only 6.5% of public supply, justifying the assessment of the water quality used by this population. With regard to water quality, the results of this study indicate that natural and anthropic factors are contributing to degradation of the water resources, with salinity, chloride, nitrates, and nitrites as major concerning pollutants. The insufficiency of the public supply in this island could be a reflection of the situation in other arid regions of Africa. Though the recent advances it is vital to continue or even increase with the international cooperation to provide for adequate water supply infrastructures.

In viscous materials systems, time and stress dependent instabilities often occur. The evolution ... more In viscous materials systems, time and stress dependent instabilities often occur. The evolution of visco-elastic systems under external stress has already been modeled by applying matricial dynamic equations comprehending elasticity and viscosity matrices. In this study we report a novel formulation for such kind of systems as a nonlinear quadratic eigenvalue problem evolving from an already defined adjacency matrix. A four mass-spring damped system is presented as case study.

Applied Mathematics & Information Sciences

In viscous material systems, time and stress dependent instabilities often occur. The evolution o... more In viscous material systems, time and stress dependent instabilities often occur. The evolution of visco-elastic systems under external stress has already been modeled by applying a matricial dynamics equation comprehending elasticity and viscosity matrices. In this study we report a novel formulation for such kind of systems in an overdamped regime as a nonlinear quadratic eigenvalue problem. The results presented were obtained after solving the eigenvalue equation of several sets of discrete damped mass-spring systems.

Ambiente & Sociedade, 2016

Although undergraduate students have great access to environmental information, it does not mean ... more Although undergraduate students have great access to environmental information, it does not mean that an environmental behavior is being developed. With the use of a scale applied to 1035 university students from Brazil and Portugal, it was examined how the environmental behavior of these students is structured. Using multivariate statistical techniques, it was verified that there is a similarity in the environmental behavior of both groups, with environmental beliefs being manifested by an opposition to the anthropocentric view. The environmental attitudes have the concerns related to the environment as their predecessor. These concerns influence the option to control economic growth, which is reinforced by the ecocentric point of view of the respondents and is manifested by the perspective of a decrease in production and in consumption as well as the promotion of welfare. Although there is a tendency, the option for green consumption is not fully accomplished.

Journal of Structural Geology, 2016

In this work the evolution of visco-elastic systems under external stress is addressed. An approa... more In this work the evolution of visco-elastic systems under external stress is addressed. An approach as a mixed complementary eigenvalue problem to model the geological folding and asymmetric boudinage in the same direction is considered. A matricial dynamics equation that comprehends elasticity and viscosity matrices is presented. An algorithm to connect material points and to build the adjacency matrix has been developed. Numerical results for a set of 16 nodes are shown.

From Micro- to Macro-scales, 2015

Chemosphere, 2015

Rare earth elements (REE) were used to assess attenuation processes in a passive system for acid ... more Rare earth elements (REE) were used to assess attenuation processes in a passive system for acid mine drainage treatment (Jales, Portugal). Hydrochemical parameters and REE contents in water, soils and sediments were obtained along the treatment system, after summer and winter. A decrease of REE contents in the water resulting from the interaction with limestone after summer occurs; in the wetlands REE are significantly released by the soil particles to the water. After winter, a higher water dynamics favors the AMD treatment effectiveness and performance since REE contents decrease along the system; La and Ce are preferentially sequestered by ochre sludge but released to the water in the wetlands, influencing the REE pattern of the creek water. Thus, REE fractionation occurs in the passive treatment systems and can be used as tracer to follow up and understand the geochemical processes that promote the remediation of AMD.

2014 14th International Conference on Computational Science and Its Applications, 2014

This work addresses a numerical study of static equilibrium states of finite dimensional systems ... more This work addresses a numerical study of static equilibrium states of finite dimensional systems with frictional contact and its application to the particular problem of friction between two geological layers with different viscosity. Its formulation as a complementarity eigenproblem requires the building up of mass M and stiffness K matrices to solve the eigenvalue equations for the relative deformation of two contacting materials.

International Journal of Phytoremediation, 2014

Waste dumps resulting from metal exploitation create serious environmental damage, providing soil... more Waste dumps resulting from metal exploitation create serious environmental damage, providing soil and water degradation over long distances. Phytostabilization can be used to remediate these mining sites. The present study aims to evaluate the behavior of selected plant species (Erica arborea, Ulex europaeus, Agrostis delicatula, and Cytisus multiflorus) that grow spontaneously in three sulfide-rich waste-dumps (Lapa Grande, Cerdeirinha, and Penedono, Portugal). These sites represent different geological, climatic and floristic settings. The results indicate distinctive levels and types of metal contamination: Penedono presents highest sulfate and metal contents, especially As, with low levels of Fe. In contrast, at Lapa Grande and Cerdeirinha Fe, Mn, and Zn are the dominant metals. In accordance, each waste dump develops a typical plant community, providing a specific vegetation inventory. At Penedono, Agrostis delicatula accumulates As, Pb, Cu, Mn, and Zn, showing higher bioaccumulation factors (BF) for Mn (32.1) and As (24.4). At Cerdeirinha, Ulex europaeus has the highest BF for Pb (984), while at Lapa Grande, Erica arborea presents high BF for Mn (9.8) and Pb (8.1). Regarding TF, low values were obtained for most of the metals, especially As (TF < 1). Therefore, the results obtained from representative plant species suggest appropriate behavior for phytostabilization measures.