Elsa Cristina Ramalho

Elsa Cristina Ramalho
Laboratório Nacional de Energia e Geologia | LNEG · Unidade de Recursos Minerais e Geofísica

PhD

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66
Publications
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Publications

Publications (66)
Conference Paper
Full-text available
This paper describes the results of the CHPM2030 research project, which was running in the period 2016-2019. It was funded through the European Commission Horizon 2020 programme with the aim to develop a novel and potentially disruptive technology solution that can help satisfy the European needs for energy and strategic metals in a single interli...
Article
Full-text available
The 150 Mt Lombador massive sulphide deposit is one of the seven known deposits of the Neves-Corvo mine. The deposit dips approximately 30º-35º to the NE and is open down dip, with current exploitation reaching down at 1 km depth. To investigate the possible downwards continuation of the deposit, a 1D constrained inversion of time-domain electromag...
Article
Full-text available
The application of geophysical techniques to massive sulphide deposits exploration has proven to be a success in the Iberian Pyrite Belt (IPB) metallogenetic province, both in Portugal and in Spain. Several hidden deposits were discovered through the interpretation of geological models, supported by geophysical data collected in land and airborne s...
Conference Paper
Full-text available
Neves-Corvo is currently the largest base metal producing mine in Europe. With the discovery of the Semblana Deposit in 2012, the region has shown to still hold good potential for reasonable size deposits. These will more likely be at depth and in a complex geologic environment. This will require the further use of and reliance on sensitive and dee...
Article
Full-text available
The existence of several springs located in the Alfama district, Lisbon, Portugal, reported since the medieval Islamic period, are an important but almost unknown part of the history of the city. The word “Alfama” probably comes from the Arabic “Al-Hamma”, which means "hot spring". This historical importance is revealed through the diversified wate...
Article
The Vila Franca de Xira (VFX) fault is a regional fault zone located about 25 km northeast of Lisbon, affecting Neogene sediments. Recent shear-wave seismic studies show that this complex fault zone is buried beneath Holocene sediments and is deforming the alluvial cover, in agreement with a previous work that proposes the fault as the source of th...
Conference Paper
Full-text available
The goal of this work is to contribute to the geological knowledge of the northern sector of the Neves-Corvo mine (Iberian Pyrite Belt, a VMS world class metalogenetic province) through the use of geophysical methods (gravity ground surveys, seismic reflection, EM profiles and airborne magnetic/radiometric-K, U, Th and Total Count), geological and...
Article
Beira city and Dondo district in Mozambique were studied with the purpose of evaluating the environmental quality of soil and to relate its quality with land cover and geology. This study revealed, by means of statistical tools, such as principal component analysis and multidimensional scaling, geochemical signatures of geogenic and anthropogenic o...
Article
Full-text available
Energy and metals are essential resources in the 21th century and with the economic and technical development are more and more required. The fulfilling of these requirements leads to the need to produce both more ore and energy. Considering these goals the project CHPM2030 ("Combined Heat, Power and Metal Extraction") was launched in January 2016,...
Preprint
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About 60 years ago, the geophysical electromagnetic method TURAM was largely used in the Iberian Pyrite Belt (IPB), Alentejo, Portugal, for a few decades. Mining companies and government entities searching for conductive ore bodies acquired a large amount of data, covering an appreciable geographical area. This method was later replaced by other ge...
Article
Full-text available
As the fourth largest city in Mozambique, and located right beside the Indian Ocean, Beira faces sanitary and environmental problems that are a strong concern to the local and national authorities. One of the major problems that Beira city has to deal with is the existence of undrinkable groundwater in many dug-wells that supply a large amount of t...
Article
Increasing use of the ground as a thermal reservoir is expected in the near future. Shallow geothermal energy (SGE) systems have proved to be sustainable alternative solutions for buildings and infrastructure conditioning in many areas across the globe in the past decades. Recently novel solutions, including energy geostructures, where SGE systems...
Article
Full-text available
Increasing use of the ground as a thermal reservoir is expected in the near future. Shallow geothermal energy (SGE) systems have proved to be sustainable alternative solutions for buildings and infrastructure conditioning in many areas across the globe in the past decades. Recently novel solutions, including energy geostructures, where SGE systems...
Article
Full-text available
Increasing use of the ground as a thermal reservoir is expected in the near future. Shallow geothermal energy (SGE) systems have proved to be sustainable alternative solutions for buildings and infrastructure conditioning in many areas across the globe in the past decades. Recently novel solutions, including energy geostructures, where SGE systems...
Article
Geoelectrical and electromagnetic (time and frequency domains) hydrogeophysical methods were applied and jointly interpreted together with auxiliary information such as regional piezometric maps, borehole lithological logs and offshore data. The objective was to retrieve the structure and geometry of the Albufeira-Ribeira de Quarteira coastal aquif...
Article
Full-text available
This paper discusses a case study concerning the application of geophysical methods in long-term contaminated areas with explosive compounds and their input to the environmental assessment and hydrogeological characterization. The study is focused on the old factory of Sociedade Portuguesa de Explosivos, located in Seixal, Portugal, that produced e...
Conference Paper
Full-text available
The region of Lisbon is an urban area with the highest population density and energy demand in Portugal. It also presents very favorable geological environments for geothermal purposes. The historical and/or current existence of warm springs and deep sedimentary aquifers in Cretaceous and Jurassic formations, identified by hydrocarbon exploration s...
Conference Paper
Full-text available
Aplicaram-se métodos geofísicos para avaliação da extensão e profundidade da contaminação de solos e águas por compostos poli-nitroaromáticos (P-NAC) e para confirmação do modelo hidrogeológico local. Validou-se a prospecção geofísica com a execução e amostragem de duas sondagens. O transporte de P-NAC nos solos-zona vadosa-matriz do aquífero freát...
Presentation
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This presentation describes the geological framework of one site heavily contaminated by explosives production, study methods to assess the situation, results and conclusions.
Chapter
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The fast development of field, data processing equipment and software has allowed the use of geophysical methods to an ever increasing range of applications. Hence nowadays it is much easier to conduct massive field surveys combining different methods, to obtain more accurate and denser data, so that complex modeling and interpretation at limited c...
Article
Full-text available
In Alfama district (Lisbon, Portugal) the existence of numerous springs is widely documented since roman times. Some of them have thermal and/or minerals features. Nowadays there are no remains of these springs or any other in the zone with similar characteristics. In this work, based on bibliographic physical-chemical analysis, a study was conduct...
Conference Paper
Full-text available
We applied geoelectrical and electromagnetic (time and frequency domains) hydrogeophysic methods to retrieve the structure of the Albufeira-Ribeira de Quarteira coastal aquifer (Algarve, Portugal) and to update the current hydrogeological conceptual model (HCM). The results allowed detecting the freshwater–saltwater interface along the coast line,...
Conference Paper
Full-text available
Garantir a sustentabilidade ambiental, integrar os princípios do desenvolvimento sustentável nas políticas e programas nacionais e inverter a actual tendência para a perda de recursos ambientais, foram os princípios orientadores para a elaboração da Carta Geoambiental da Região da Grande Beira, Moçambique (CGRGB). Esta é um complemento à Carta Geol...
Article
Full-text available
The thermal hot springs of Caldas de Monção, located in Northern Portugal, are supplied by a thermal water aquifer that must be preserved from pollution and anthropic effects. Enhancement of knowledge about the aquifer is therefore needed, so sustainable management and water quality preservation can be conducted, namely by replacing the springs by...
Article
Full-text available
The Nisa uranium deposit, located in Central Portugal, has been known since the late 1960s. Some areas were explored at that time. Today, a few open pits and dumps remain in place and are a concern to local authorities. To assess the geoenvironmental problems caused by the main mining exploration composed of an experimental rock blasting, 3D electr...
Article
Full-text available
The Algarve province is located a few hundred kilometres north of the crossing of the E–W Eurasia–Africa plate boundary in an area of diffuse seismicity and broad deformation. It is characterised by a moderate seismicity, with some important historical and instrumental earthquakes causing loss of lives and significant material damages. The area is...
Conference Paper
Full-text available
Cerca de 60 a 70% das necessidades de água para uso industrial, doméstico e agrícola em Portugal, e na União Europeia, são garantidas actualmente mediante a exploração de recursos de água subterrânea. A preservação da qualidade destes recursos de água é simultaneamente um dos principais problemas e desafios ambientais da actualidade. Ao longo dos t...
Article
Full-text available
This paper describes a case study concerning the use of integrated geophysical methods applied to environmental assessment. The study is focused on an old municipal solid waste sealed landfill site, located in Gaeiras, Central Portugal. The problem is related with leachate overproduction in this domestic and industrial waste landfill that became an...
Chapter
Portugal is a country with a large tradition in uranium exploitation in the XXth century with 61 registered old uranium abandoned mines. Those uranium exploitations, mostly located in the central part of the country, created open pits that in most cases were simply abandoned, causing environmental problems that sometimes lasted for decades. More re...
Article
The present study was carried out in the Khor-El-Ramlah area, in a Nubian sandstone aquifer. It is located in the western bank of Nasser Lake, southern Egypt, in a tectonically active area, which is dissected by many regional faults extending towards the lake. For this reason, the Nubian sandstone aquifer in this area is expected to be recharged by...
Chapter
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IntroductionStudy areaMaterials and methodsResultsDiscussionConclusions AcknowledgementsReferences
Article
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Ground-penetrating radar signal propagation is strongly controlled by water content. Therefore, it can be employed to address numerous hydrogeological problems, ranging from geological structures to petrophysical properties. In the present study, ground-penetrating radar and vertical electric sounding measured data are analysed and combined to answ...
Article
A major plan for Portugal Mainland is being envisaged to use old open pits from abandoned uranium mining sites as “Waste Containment Deposits”. These areas will store mining waste from other adjacent mines. The old mining sites classification to this kind of usage is carried out accordingly to its location, accessibility, geological and hydrogeolog...
Book
Full-text available
Embora por vezes subvalorizadas por alguns técnicos que trabalham em Hidrogeologia, as diagrafias constituem uma importante ferramenta de suporte na elaboração do projecto de uma captação, permitindo que se obtenham maiores rendimentos com menores custos. Esta importância sustenta-se em aspectos tão diversos da utilização de diagrafias como a defin...
Article
Surface heat flow density (HFD) estimates in the Portuguese northern Hercynian Massif are difficult to obtain using the usual Fourier method. As a matter of fact, this zone is mostly composed by granitoid and meta- morphic rocks, and most wells drilled there are too shallow for reliable HFD calculations; furthermore, HFD estimates are scarce and th...
Article
Full-text available
The Carcavai fault zone is a NE-SW trending outcropping structure extending between S. Brás de Alportel (North) and Quarteira (south), with a total length of about 20 km, presenting reverse fault geometry with left-lateral strike- slip component. It is located close to the city of Loulé, in the Algarve region, southern Portugal. The fault zone has...
Article
Full-text available
In 2002, an accidental release of unlead gasoline from a ruptured underground storage tank of a gas station has contaminated soils and groundwater. Although remediation actions have taken place, groundwater is still contaminated. During the last year, hydrogeological and geophysical investigations have been carried out in the area between the gas s...
Poster
Full-text available
O MÉTODO TURAM O método Turam baseia-se na criação de um campo magnético (primário) geralmente de 440 a 550 Hz, gerado por uma corrente, que passa num cabo rectilíneo ligado à terra em ambos os extremos ou num cabo disposto segundo uma grande espira rectangular ou circular, ligados a um gerador (Telford, 1990). Quando existem corpos condutores no s...
Article
Full-text available
A existência de várias nascentes em Alfama, relatada desde pelo menos os tempos árabes, conheceu vários tipos de utilização ao longo dos séculos, fazendo parte da história da cidade de Lisboa. Esta importância histórica revela-se nos vários aspectos relativos à utilização diversificada das águas, como o abastecimento dos barcos durante a época dos...
Article
Full-text available
O património hidrogeológico das Águas de Alfama, em Lisboa, é aqui abordado de forma muito sucinta, através do modo como as suas águas foram utilizadas ao longo de vários séculos. Faz-se igualmente uma descrição geológica da zona e uma caracterização hidroquímica muito genérica das águas, baseadas em registos históricos. Por fim perspectivam-se nov...
Conference Paper
Full-text available
The ability of Geophysical methods in identifying either faults or conductive zones was used to understand two geological and hydrogeological critical zones near the Prado Velho abandoned uranium mine site, Portugal. Considering that this old open pit is one of the chosen sites to be used in the near future as a " Waste Containment Deposit " , a co...
Article
This paper describes the application of geostatistical methods to the existing geothermal data set obtained in the hesperic massif in Southern Portugal, namely in the Ossa Morena and South Portuguese Zones. These data are considered to be of major importance to understand the distribution of physical properties in the crust. A geostatistical analys...
Data
Preliminary data concerning the Belverde borehole (coordenates: 38º35’34.1’’/9º8’24.7’’) are presented. The borehole reached 619,77 m. It crossed 130,31m of Pleisto-Pliocene continental deposits, 460 m of Miocene (mainly marine deposits; some marsh ones also occur). At the lower part, a coral reef with 50m thick was recognised. It overlays red cont...
Article
Full-text available
Key-words: Borehole; Neogene; Geophysical logs; Belverde; Lower Tagus Basin; Portugal. In the aim of the project "Recognition of the Miocene of the aistal region of the Lower Tagus Basin through a borehole with continuous sampling", Temperature, Natural Gamma Ray, Neutron (almost in all the borehole), Sonic, SP and SPR (in two small sections in up...
Conference Paper
Full-text available
Keywords: borehole; Lower Tagus Basin; Neogene; stratigraphy; Belverde; Setúbal Peninsula; Portugal. Preliminary data concerning the Belverde borehole (coordenates: 38º35’34.1’’/9º8’24.7’’) are presented. The borehole reached 619,77 m. It crossed 130,31m of Pleisto-Pliocene continental deposits, 460 m of Miocene (mainly marine deposits; some marsh...
Article
Full-text available
Preliminary data concerning the Belverde borehole (coordenates: 38º35’34.1’’/9º8’24.7’’) are presented. The borehole reached 619,77 m. It crossed 130,31m of Pleisto-Pliocene continental deposits, 460 m of Miocene (mainly marine deposits; some marsh ones also occur). At the lower part, a coral reef with 50m thick was recognised. It overlays red cont...
Article
New heat flow density data and radiogenic heat production values obtained in southern Portugal, along with lithologic and structural data inferred from vertical seismic velocity distributions from deep seismic refraction surveys, are used to construct one-dimensional (1D) geotherms for the crust in the two main geotectonic units of the region, i.e....
Article
Previous geothermal work has indicated that a geothermal anomaly with heat flow density values in excess of 200 mW/m2 exists in southern Portugal. Other geological and geophysical data from the area show no evidence of such an anomaly. To determine whether or not a geothermal anomaly occurs there, the published geothermal data and some new temperat...
Article
The first heat-flow and heat-production maps of the Iberian Peninsula and its margins using previously acquired data are presented. The surface heat-flow map includes 553 determinations carried out on water and mining exploration wells, oil exploration wells and on the seafloor. The surface heat flow varies noticeably from the Iberian mainland (65...
Article
Landfills are the classical solution for waste disposal. During the last years there has been a growing concern about the effect of landfills in public health, because leaching water can contaminate nearby aquifers. Hydrogeological studies are very important to investigate and remedy these contamination problems but an integrated use of both geophy...
Article
Full-text available
The collection and use of geothermal information to draw a heat flow density (HFD) map and determine the geothermal regime of the crust for mainland Portugal began at the end of the seventies. The data have been collected from all the available scientific publications and internal reports of Portuguese institutions that have been working in the geo...
Article
Full-text available
Resumo Este trabalho pretende dar a conhecer ou a relembrar a existência em Lisboa de um conjunto de nascentes localizadas na zona de Alfama, cujas águas, quentes, foram no século XIX qualificadas como "águas minero-medicinais" pela então Inspecção de Águas. As águas destas nascentes, entretanto totalmente seladas e abandonadas há mais de 25 anos,...

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