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+34 93 401 18 60Esta dirección de correo electrónico está siendo protegida contra los robots de spam. Necesita tener JavaScript habilitado para poder verlo.
UPC: C/ Jordi Girona 31, (08034 - Barcelona) - IDAEA: C/ Jordi Girona 18-26, (08034 - Barcelona)

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Formación, cursos, eventos y seminarios

An approach of groundwater management in Barcelona City

a cargo de: Rotman Criollo

Dia: Jueves 16 de Marzo a las 12:15 h


Lugar: Departamento de Ingeniería del Terreno, Aula CIHS, Planta Baja

Abstract:

Due to the general increase of water scarcity, water quantity and quality must be well known to ensure a proper access to water resources in compliance with local and regional directives. This circumstance can be supported by tools which facilitate process of data management and its analysis. Such analyses have to provide researchers, professionals, policy makers and users with the ability to improve the management of the water resources with standard regulatory guidelines. Specialised tools developed into a geospatial platform is a good option to aid users to share their knowledge and to involve all the stakeholders in a common environment.

In this seminar we will show you the different tools are being implemented in the Barcelona City and their current stage of the project.

Retention Mechanisms of Rare Earth Elements and Yttrium (REY) from acid mine drainage

a cargo de: Alba Lozano
Día: Jueves 09 de Marzo a las 12:15 h
Lugar: Departamento de Ingeniería del Terreno, Aula CIHS, Planta Baja

Abstract:

Rare Earth Elements and Yttrium (REY) are critical raw materials which are essential for modern technologies. They are conventionally mined from igneous rocks from China, and they are now a priority exploration target worldwide. One of the research goals through the European ERAMIN-AMDREY project and the Spanish EMPATIA project is the extraction of REY from the treatment of Acid Mine Drainage (AMD) waters.

Laboratory experiments simulating AMD treatment were performed in columns to better understand the geochemical and mineralogical processes that play in the remediation systems and to determine where REY are retained. The evolution of pore water composition inside two columns revealed that REY content decreased together with Al concentration at pH higher than 4. Sequential extractions of precipitates confirm that the majority of REY are removed in Al zone where basaluminite precipitates (Al4SO4OH10·5H2O). This suggests that REY can be sorbed and coprecipitated with basaluminite.

Different batch sorption experiments were carried out to study REY sorption on basaluminite. Since Lanthanide (Ln3+) aqueous speciation in AMD waters with high SO42- concentrations are dominated by LnSO4+ complex, a first hypothesis is that REY are incorporated as LnSO4+. Synchrotron based experiments were performed in order to elucidate the binding mechanism of REY into basaluminite by EXAFS measurements, in Ln-SO4 solutions and in REY-doped basaluminites.

DEFENSA TESI DOCTORAL - DEFENSA TESIS DOCTORAL - PhD THESIS DEFENSE

Induced Seismicity in Enhanced Geothermal Systems: Assessment of Thermo-Hydro-Mechanical Effects

 

 

Silvia de Simone

Thesis advisors:
Dr. Jesús Carrera Ramírez (CSIC) 
Dr. Víctor Vilarrasa (CSIC)
Maarten Saaltink (UPC) 



DATE: Wednesday, march 29th 2017
Hour: 11:00

 

Place: UPC, Campus Nord. Building C1. Classroom: 002.


ABSTRACT

Micro-seismicity, and especially felt seismicity, induced by Enhanced Geothermal Systems (EGS) operations is a matter of scientific interest, not only because of the related risks and concerns, but also because the correspondence between injection and seismic activity still remains unclear. The Thesis aims to deepen the understanding of the involved Thermo-Hydro-Mechanical (THM) processes, in order to explain and manage co- and post-injection seismicity.

First, we investigate the HM coupling and its effects on pressure response. Fluids injection exerts a force over the aquifer that causes deformation. This implies that Specific Storage, which reflects the capacity of permeable media to deform, cannot be treated as a single parameter, like in classical groundwater hydrology, because deformation also depends on aquifer geometry and on surrounding formations, which constrain displacements. We demonstrate the non-local nature of storage (i.e., its dependence on the poroelastic response over the whole aquifer) by means of analytical solutions to the transient pressure response to injection into one-dimensional and cylindrical finite aquifers, while acknowledging HM coupling. We find that the pressure response is faster and much greater than predicted with traditional solutions.

Second, we consider non-isothermal injection and compare the effects of HM and TM couplings. We present analytical expressions for long-term hydraulic and thermal stresses and displacements for unidirectional and radial geometries. To obtain them, we assume steady-state fluid flow and develop an easy-to-use solution to the transient heat transport problem. The solution is then used to illustrate the poroelastic and thermoelastic response and, in particular, the sensitivity of stresses to the outer mechanical boundary conditions.

Third, we perform coupled HM and THM simulations of cold water injection in a fault-intact rock system, which allows us to analyze mechanical stability changes during injection in the vicinity of the well. Simulation results show that temperature drop induces a significant perturbation of stresses in the intact rock near the injection well. This perturbation is likely to induce seismicity around critically oriented fractures. HM simulations show that fracture stability depends on the orientation of the faults and on the initial stress tensor. Results show that TM effects dominate and could induce seismicity, when the largest confining stress acts perpendicular to a fracture.

Finally, we investigate the mechanisms that may induce seismicity after the end of fluid injection into a deep geothermal system (post-injection seismicity). Apart from the direct impact of fluid pressure increase, we acknowledge thermal effects due to cooling and stress redistribution caused by shear slip along favorably oriented fractures during injection. The effect of these three processes are analyzed both separately and superimposed. We find that post-injection seismicity may occur on unfavorably oriented faults that were originally stable. During injection, such faults become destabilized by thermal and shear slip stress changes, but remain static by the superposition of the stabilizing effect of pressure forces. However, these fractures become unstable and fail when the pressure forcing dissipates shortly after injection stops abruptly, which suggests that a slow reduction in injection rate may alleviate post-injection seismicity.

Eulerian and Lagrangian velocities statistics in steady Darcian flow and the impact on solute dispersion

a cargo de: Vivien Hakoun, Alessandro Comolli and Marco Dentz  (CSIC-IDAEA)

Día: Jueves 2 de Marzo a las 12:15 h

Lugar: Departamento de Ingeniería del Terreno, Aula CIHS, Planta Baja


Abstract:
We discuss the dynamics of solute and particle dispersion in heterogeneous porous media. The interplay between the spatial organization of the flow field and velocity fluctuations generates transport behaviors, for instance early and late solute arrivals, and non-linear evolution of solute dispersion, as observed in field and laboratory experiments. Such behaviors cannot be predicted by advection-dispersion models for equivalent homogeneous media. Furthermore, transport predictions with models based on perturbation theory remain limited to $\log$ hydraulic conductivity fields with variances smaller than 1. This limits our predictive capabilities for highly heterogeneous porous media.  We perform numerical simulations of solute dispersion and breakthrough curves for heterogeneous velocity fields with variances of the log-K field up to 7, for which we observe non-Fickian transport features.  In order to understand the dynamics leading to these behaviors, we investigate the relationship between hydraulic conductivity fields and Eulerian and Lagrangian (particle) velocities.  We find a quantitative relationship between hydraulic conductivity and the Eulerian and Lagrangian velocity distributions that allows to predict large scale non-Fickian transport using a continous time random walk model based on a geostatistical medium description.

Diseño e instrumentación de tanques para simulación de recarga artificial de acuíferos

a cargo de: Lurdes Martinez Landa

Fecha: Jueves 16 de Febrero a las 12:15 h

Lugar: Departamento de Ingeniería del Terreno, Aula CIHS, Planta Baja

 

Resumen:

En el marco del proyecto ACWAPUR (ACcelerated WAter PURification during artificial recharge of aquifers, a tool to restore drinking water resources) se quiere estudiar el efecto de las barreras reactivas y el papel de las plantas para el tratamiento de aguas depuradas. Para ello se ha diseñado una batería de 6 tanques en los que se simula la balsa de recarga y el acuífero para diferentes condiciones.

El agua que se utilizará para la recarga es la salida del secundario de una estación depuradora, por lo que las balsas experimentales se están construyendo dentro del recinto de una EDAR. Actualmente se está acabando de construir los tanques y en breve habrá que instrumentarlos. El objetivo de este seminario es el de presentaros el diseño de la instrumentación esperando vuestros comentarios, ahora que aún estamos a tiempo de modificaciones.

Effects of temporal fluctuations and fluid density effects on heterogeneous aquifers

a cargo de: Maria Pool
Fecha: Jueves 12 de Enero a las 12:15 h
Lugar: Departamento de Ingeniería del Terreno, Aula CIHS, Planta Baja

Abstract:

Mixing and dispersion in coastal aquifers are strongly influenced by periodic temporal flow fluctuations on multiple time scales ranging from days (tides), seasons (pumping and recharge) to glacial cycles (regression and transgressions). Transient forcing effects lead to a complex space and time dependent flow response which induces enhanced spreading and mixing of dissolved substances. We study the combined effect of heterogeneity in the hydraulic conductivity field and tidal oscillations on the dynamics of seawater intrusion in coastal aquifers. We also investigate the impact of transient forcing on mixing between two fluids of different density for a stable stratification. Three- and two-dimensional Monte Carlo realizations of log-normally distributed permeability fields were performed, and for each realization, numerical variable density flow and solute transport simulations were conducted. We also consider more complex heterogeneous fields characterized by connected patterns of high and low conductivity. The effects of spatial and temporal variability and their coupling with variable-density flow on mixing is characterized by measurable diagnostics which characterize the transition zone and the interface location. We also analyze the mechanisms of mixing in terms of the deformation properties and topology of the flow field and specifically its stretching behavior, which plays a key role of the understanding of mixing.

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