Papers by ricardo juncosa
Geochemical processes induced by the combined effect of heat and hydration of compacted bentonites
Improvements in Mero River Basin Water Supply Regulation Through Integration of a Mining Pit Lake as a Water Supply Source
Mine Water and The Environment, Nov 13, 2015
Seasonal increases in demand puts a strain on water supplies in the city of La Coruña (northwest ... more Seasonal increases in demand puts a strain on water supplies in the city of La Coruña (northwest Spain) and its surroundings during times of drought. Exploitation of Meirama Lake, a pit lake forming in a former lignite mine, could supplement the Abegondo-Cecebre reservoir, the city’s main water supply. We analysed the hydrochemistry and the Mero River basin regulations to determine whether the water quantity and quality could meet the needs during periods of increased demand and drought, and still satisfy ecological conditions required by law. Our results indicated that joint use of the two reservoirs is feasible. The local administration is implementing the recommendations by building a tunnel to tap into the pit lake.ZusammenfassungSaisonale Steigerungen des Wasserbedarfs während Trockenperioden belasten die Wasserversorgung in der Stadt La Coruna (Nordwestspanien) und deren Umland. Durch die Erschließung des Sees Meirama, einem Bergbaufolgesee des Braunkohlenbergbaus, konnte die Hauptwasserversorgung der Stadt durch die Abegondo-Cecebre-Talsperre ergänzt werden. Wir untersuchten die Hydrogeochemie und die Steuerung des Wasserdargebots des Flusses Mero, um zu prüfen, ob die Ansprüche an die Wassermenge und –qualität während Zeiten mit erhöhtem Wasserbedarf bzw. Trockenheit und bei gleichzeitiger Einhaltung ökologischer Bedingungen nach Gesetzeslage erfüllt werden können. Unsere Ergebnisse deuten darauf hin, dass die gemeinschaftliche Nutzung beider Wasserreservoire möglich ist. Die lokale Verwaltung baut derzeit einen Tunnel, um den Bergbaufolgesee anzubinden und damit die Empfehlungen zur Steuerung der Wasserversorgung umzusetzen.ResumenLos incrementos estacionales en la demanda provocan dificultades en el suministro de agua en la ciudad de La Coruña (noroeste de España) y sus alrededores durante tiempos de sequía. La explotación del lago Meirama, un lago formado en el hueco de una antigua mina de lignito, podría suplementar el embalse de Abegondo-Cecebre que es la principal fuente de agua de la ciudad. Hemos analizado la hidroquímica y las regulaciones de la cuenca del río Mero para determinar si la cantidad y calidad del agua podría satisfacer las necesidades durante los períodos de demanda creciente y sequía y satisfacer las condiciones ecológicas requeridas por ley. Nuestros resultados indicaron que el uso compartido de ambos reservorios es factible. La administración local está implementando las recomendaciones construyendo un túnel para aprovechar el lago del hoyo de mina.总结旱季季节性需水增长加重了拉科鲁尼亚市(La Coruña)及其周边地区(Northwest Spain)供水压力。由褐煤开挖形成的Meirama采坑湖水可作城市供水Abegondo Cecebre水库的补充水源。分析了采坑湖水化学特征及Mero流域管理要求,研究了采矿湖水水质和水量是否满足干旱期需水要求及法律规定的生态要求。研究结果表明两水库水联合调度是可行的。当地政府已采纳建议并修建一条通向采坑湖的输水通道。
Radiochimica Acta, May 28, 2010
Summary. Radioactive decay is an important subject to take into account when studying the thermo-... more Summary. Radioactive decay is an important subject to take into account when studying the thermo-hydro-dynamic behavior of the buffer clay material used in the containment of radioactive waste. The modern concepts for the multibarrier design of a repository of high level waste in deep geologic formations consider that once canisters have failed, the buffer clay material must ensure the retention and/or delay of radionuclides within the time framework given in the assessment studies. Within the clay buffer, different chemical species are retarded/fixed according to several physicochemical processes (ion exchange, surface complexation, precipitation, matrix diffusion, ...) but typical approaches do not consider the eventuality that radioactive species change their chemical nature (i.e. phase) thereby affecting their reactive behavior. The radioactive decay of an element takes place independently of the phase (aqueous, solid or gaseous) to which it belongs. This means that, in terms of radionuclide fixation, some geochemical processes will be effective scavengers (for instance mineral precipitation of crystal growth) while others will not (for instance ion exchange and/or sorption). In this contribution we present a reactive radioactive decay model of any number of chemical components including those that belong to decay series. The model, which is named FLOW-DECAY, also takes into account flow and isotopic migration and it has been applied considering a hypothetical model scenario provided by the project ENRESA 2000 and direct comparison with the results generated by the probabilistic code GoldSim. Results indicate that FLOW-DECAY may simulate the decay processes in a similar way that GoldSim, being the differences related to factors associated to code architecture.
Multiphase non isothermic flux models with chemical reactions
The formation of natural lakes is a process that takes place over thousands of years, although th... more The formation of natural lakes is a process that takes place over thousands of years, although the volumetric formation depends on hydrological and climatological phenomena, reaching a stationary hydraulic regime, the evolution of hydrochemistry is more complex and obeys not only phenomena of stoichiometry and chemical kinetics, but also diffusion processes. Depending on the depth of the lakes, the anoxisation process originating from the bottom is the first phase of the lake's methanogenesis. For this, the course of many thousands of years is necessary, so the studies carried out in the lakes are limited to the current knowledge of the state in which they are, without being able to have real information in this process of methanogenesis. There are no data available on the generation process of a natural lake in its primary stages. In this case, taking advantage of the rehabilitation of the old open-pit mining of Meirama (Northwest Spain), consisting of the controlled flooding o...
Water
Water is necessary for the development and support of human life. The ability of water to supply ... more Water is necessary for the development and support of human life. The ability of water to supply the different populations has different origins: water taken from river diversions, water from underground catchments, water from lakes and reservoirs, water from the recirculation of treated water, etc. Episodes of turbidity and color changes in the water supply in pipe distribution systems are non-isolated problems that occur in many cities and towns. In particular, sedimentation in water supply pipelines and the subsequent resuspension of these particles in the system have created the need to investigate the processes and variables that promote turbidity episodes, including why, when, and where these episodes occur. In this study, different physicochemical parameters were investigated and analyzed in the water supply distribution network of the city of La Coruña (northwest Spain) through a pipe monitoring panel under real operating conditions. The supply waters come from the Mero rive...
Identificación de la contribución antrópica de metales en serrines de corte de granito
Environmental Earth Sciences, 2018
A finite-element model has been developed in MATLAB to solve the groundwater flow in natural wate... more A finite-element model has been developed in MATLAB to solve the groundwater flow in natural watersheds. The present model incorporates some efficient tools that evaluate the natural conditions of the water catchments including an evaluation of the free water flow based on the continuity of mass. The resulting model does not include the verification of the continuity of momentum nor a turbulence model, but still provides a proper overall assessment of the flow in the watershed, that can be refined with a further turbulent assessment of the free surface flow. The model has been verified through its comparison with some benchmark problems showing to be both accurate and numerically efficient. Finally, it has been used in the resolution of some practical cases that show its capabilities with a special focus on the Barcés river watershed, intensely monitored by this research group in the last decades.
Improvements in Mero River Basin Water Supply Regulation Through Integration of a Mining Pit Lake as a Water Supply Source
Mine Water and the Environment, 2015
Seasonal increases in demand puts a strain on water supplies in the city of La Coruña (northwest ... more Seasonal increases in demand puts a strain on water supplies in the city of La Coruña (northwest Spain) and its surroundings during times of drought. Exploitation of Meirama Lake, a pit lake forming in a former lignite mine, could supplement the Abegondo-Cecebre reservoir, the city’s main water supply. We analysed the hydrochemistry and the Mero River basin regulations to determine whether the water quantity and quality could meet the needs during periods of increased demand and drought, and still satisfy ecological conditions required by law. Our results indicated that joint use of the two reservoirs is feasible. The local administration is implementing the recommendations by building a tunnel to tap into the pit lake.ZusammenfassungSaisonale Steigerungen des Wasserbedarfs während Trockenperioden belasten die Wasserversorgung in der Stadt La Coruna (Nordwestspanien) und deren Umland. Durch die Erschließung des Sees Meirama, einem Bergbaufolgesee des Braunkohlenbergbaus, konnte die Hauptwasserversorgung der Stadt durch die Abegondo-Cecebre-Talsperre ergänzt werden. Wir untersuchten die Hydrogeochemie und die Steuerung des Wasserdargebots des Flusses Mero, um zu prüfen, ob die Ansprüche an die Wassermenge und –qualität während Zeiten mit erhöhtem Wasserbedarf bzw. Trockenheit und bei gleichzeitiger Einhaltung ökologischer Bedingungen nach Gesetzeslage erfüllt werden können. Unsere Ergebnisse deuten darauf hin, dass die gemeinschaftliche Nutzung beider Wasserreservoire möglich ist. Die lokale Verwaltung baut derzeit einen Tunnel, um den Bergbaufolgesee anzubinden und damit die Empfehlungen zur Steuerung der Wasserversorgung umzusetzen.ResumenLos incrementos estacionales en la demanda provocan dificultades en el suministro de agua en la ciudad de La Coruña (noroeste de España) y sus alrededores durante tiempos de sequía. La explotación del lago Meirama, un lago formado en el hueco de una antigua mina de lignito, podría suplementar el embalse de Abegondo-Cecebre que es la principal fuente de agua de la ciudad. Hemos analizado la hidroquímica y las regulaciones de la cuenca del río Mero para determinar si la cantidad y calidad del agua podría satisfacer las necesidades durante los períodos de demanda creciente y sequía y satisfacer las condiciones ecológicas requeridas por ley. Nuestros resultados indicaron que el uso compartido de ambos reservorios es factible. La administración local está implementando las recomendaciones construyendo un túnel para aprovechar el lago del hoyo de mina.总结旱季季节性需水增长加重了拉科鲁尼亚市(La Coruña)及其周边地区(Northwest Spain)供水压力。由褐煤开挖形成的Meirama采坑湖水可作城市供水Abegondo Cecebre水库的补充水源。分析了采坑湖水化学特征及Mero流域管理要求,研究了采矿湖水水质和水量是否满足干旱期需水要求及法律规定的生态要求。研究结果表明两水库水联合调度是可行的。当地政府已采纳建议并修建一条通向采坑湖的输水通道。
Finite element numerical formulation of non-isothermal multiphase flow and reactive transport problems in porous media
Revista Internacional de Métodos Numéricos para Cálculo y Diseño en Ingeniería
Fabricación de mortero y hormigón a partir del reciclaje del fuel del Prestige
Modelos aclopados termo-hidro-geoquímicos: códigos de la serie core (core 2d, visual-core, fades-core, inverse-core, bio-core)
Hydrodynamic and reactive transport modeling of the behavior of compacted granite saw dust for landfill liners and covers
Proceedings of the 12th International Symposium on Water-Rock Interaction, Kunming, China, 31 July - 5 August 2007, 2007
Radiochimica Acta, 2010
Radioactive decay is an important subject to take into account when studying the thermo-hydro-dyn... more Radioactive decay is an important subject to take into account when studying the thermo-hydro-dynamic behavior of the buffer clay material used in the containment of radioactive waste. The modern concepts for the multibarrier design of a repository of high level waste in deep geologic formations consider that once canisters have failed, the buffer clay material must ensure the retention and/or delay of radionuclides within the time framework given in the assessment studies. Within the clay buffer, different chemical species are retarded/fixed according to several physicochemical processes (ion exchange, surface complexation, precipitation, matrix diffusion, ...) but typical approaches do not consider the eventuality that radioactive species change their chemical nature (The radioactive decay of an element takes place independently of the phase (aqueous, solid or gaseous) to which it belongs. This means that, in terms of radionuclide fixation, some geochemical processes will be effec...
Characterization and geochemical–geotechnical properties of granite sawdust produced by the dimension stone industry of O Porriño (Pontevedra, Spain)
Quarterly Journal of Engineering Geology and Hydrogeology, 2010
Abstract The dimension stone industry is one of the leading economic activities of Galicia and it... more Abstract The dimension stone industry is one of the leading economic activities of Galicia and it is also an important industry in many other parts in the world. During the sawing and preparation of dimension stone, a large amount of granite sawdust is generated. In the O Porriño area alone, located in the southern part of Galicia, c. 300 000 tonnes are produced every year. According to current EU Directives, granite sawdust is considered to be waste and its disposal must conform to the environmental standards that result from their implementation. The pertinent Spanish laws have established the need to lay down a suitable strategy for the characterization and assessment of sawdust products for the purpose of their satisfactory integration into the dimension stone productive chain. This paper presents the results of a comprehensive characterization study of the granite sawdust of O Porriño (Pontevedra, NW Spain), including a description of its physicochemical, mineralogical and geotechnical properties. On the basis of the results of this characterization, we raise the question of the suitability of this material for use in earthworks as well as in the construction of layers for landfill sealing and/or waterproofing. Our findings show that the properties of granite sawdust are suitable for such purposes, and other possible uses are being studied in continuing research.
Environmental earth sciences, Jan 30, 2024
The application of an old open-pit lignite mine as an auxiliary reservoir for the supply of the c... more The application of an old open-pit lignite mine as an auxiliary reservoir for the supply of the city of La Coruña has involved a detailed analysis of the chemical quality of the vertical profile. The study has shown that a stratified lake is formed where the shape of the filling (first with groundwater and later surface waters from the nearby rivers were added) has influenced the formation of the lake profile. The Meirama mine is an open-pit brown lignite mine located in NW Spain. Exploitation ended in March 2008, leaving a pit of approximately 146 hm 3 with a maximum depth of 205 m. The rehabilitation of the pit consisted of the creation of a lake that will serve as an auxiliary water reservoir for the city of La Coruña. The filling process lasted approximately 8 years (March 2008-May 2016) with subterranean and surface contributions from the environment. The formation of an invariant chemocline and a seasonal thermocline was observed. Therefore, in this work, (the first of a series of two articles), an analysis of the evolution of various physicochemical parameters, elements, and compounds at certain heights (the surface, the first 2 m (2 mbs), at 59 masl, and at the bottom (2 masl)). In this first article, the physicochemical parameters of pH, dissolved oxygen, temperature, and some metallic elements (iron and manganese) are analysed. From the analyzed parameters it can be seen the creation of a surface thermocline and a chemocline at a depth of 59 masl with the beginning of the formation of anoxic conditions of the bottom of the pit through the consumption of oxygen.
Metodología de cálculo de la paleorrecarga. Aplicación y resultados obtenidos para los últimos 100000 años en un área granítica del suroeste peninsular
El programa español en biosfera: proyecto BIORAD
Vas Jornadas de …, 2003
... Autores: Fernando Recreo Jiménez, I. Simón, C. Ruiz, A. Tallos, L. Lomba, J. Delgado, T. Torr... more ... Autores: Fernando Recreo Jiménez, I. Simón, C. Ruiz, A. Tallos, L. Lomba, J. Delgado, T. Torres, JE Ortiz, Paloma Gómez González, Ricardo Juncosa Rivera, P. Pinedo, A. Agüero, María Jesús Turrero Jiménez, P. Rivas, Antonio Vela, Belén Buil, J. Astudillo; ...
Water and Society III, 2015
The present research is concerned with the latest developments and practical application of a phy... more The present research is concerned with the latest developments and practical application of a physically-based numerical model MELEF (Modèle d'ÉLÉments Fluides, in French) that incorporates a finite elements solution to the steady/transient problems of the joint ground/surface fresh/salt water flows in inland and coastal regulated watersheds. The proposed model considers surface and groundwater interactions to be 2-D horizontally distributed and depthaveraged through a diffusive wave approach. Infiltration rates, overland flows and evapotranspiration processes are considered by diffuse discharge from surface water, non-saturated subsoil and groundwater table. Recent developments also allow for the management of surface water flow control through the capacity of diversion on river beds, spillways and outflow operations of floodgates in weirs and dams of reservoirs. The application regards the actual hydrology of the Mero River watershed, with two important water bodies mainly concerned with the water resources management at the Cecebre Reservoir and the present flooding of a deep coal mining excavation. The model was adapted and calibrated during a period of five years (2008/2012) with the help of hydrological parameters, registered flow rates, water levels, precipitation, water uses and water management operations in surface and groundwater bodies. The results presented predict the likely evolution of the Cecebre Reservoir, the flow rates in rivers and the flooding of the Meirama open pit.
La minería del carbón en Galicia ha constituido una importante actividad que, por distintos motiv... more La minería del carbón en Galicia ha constituido una importante actividad que, por distintos motivos, concluyó en 2008 con el cierre de sus dos grandes explotaciones: As Pontes de García Rodríguez, (ENDESA Generación) y Meirama (Lignitos de Meirama S.A., LIMEISA). En ambas minas, el eje principal de la restauración es la inundación controlada de sus cieloabiertos. Con ello, se encuentran en proceso de formación dos grandes lagos mineros (∼550 hm3 y 8 km2 en el caso de As Pontes y ∼155 hm3 y 2 km2 en el de Meirama) únicos en Galicia y singulares en el contexto de la minería nacional e internacional.
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Papers by ricardo juncosa