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+34 93 401 18 60This email address is being protected from spambots. You need JavaScript enabled to view it.
UPC: C/ Jordi Girona 31, (08034 - Barcelona) - IDAEA: C/ Jordi Girona 18-26, (08034 - Barcelona)

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Charla Técnica AIH. Métodos para la caracterización y monitoreo de acuíferos costeros a diferentes escalas

Charla técnica AIH - Capítulo Chileno

Estimada comunidad, la Asociación Internacional de Hidrogeólogos - Capítulo Chileno tiene el gusto de invitarlos a la charla técnica: Métodos para la caracterización y monitoreo de acuíferos costeros a diferentes escalas.

Fecha: 23 de julio a las 12.00 horas (Mediodía).
Relator: Albert Folch, Researcher at the Hydrogeology Group, Technical University of Catalonia (Barcelona)
Formato: Webinar
Costo: Sin costo (gratis), apuntándose en el formulario cuyo link se encuentra más abajo.
Fecha límite de inscripción: 22 de julio hasta las 18.00 horas.

 

Tema de la charla:

Los procesos que tienen lugar en acuíferos costeros presentan una importancia doble. Por un lado, la intrusión salina que se produce en al acuífero nos condiciona la cantidad de recursos hídricos subterráneos que vamos a tener disponibles; por el otro, la cantidad, y sobre todo la calidad del agua que descarga al mar puede tener implicaciones para los ecosistemas costeros. En esta charla, se explicarán diferentes métodos que se han venido desarrollando recientemente para el estudio de acuíferos costeros en el Grupo de Hidrología Subterránea (UPC-CSIC) en colaboración con otras universidades y centros de investigación. A escala local, se ha desarrollado un site experimental cerca de Barcelona de medidas 60 x 30 metros con 16 sondeos donde se ha aplicado tomografía eléctrica de resistividad entre sondeos, medidas distribuidas de la temperatura mediante fibra óptica (resolución espacial métrica y temporal de hasta segundos) y logging de inducción para el estudio de la intrusión salina. A una escala mayor se explicarán métodos que se están desarrollando actualmente centrados principalmente en el estudio de la descarga de agua subterránea al mar. Por un lado, se está trabajando con la tomografía eléctrica marina para identificar zonas de descarga de agua dulce en el fondo marino y al mismo tiempo entender mejor la hidrodinámica de los acuíferos costeros. Por otro lado, se está investigando la aplicación de imágenes térmicas satelitales de Landsat 8, de cobertura mundial, como posible herramienta para la identificación de zonas de descarga de agua subterránea. Estos métodos han sido y/o están siendo desarrollados dentro de proyectos de investigación, así como para la evaluación de recursos hídricos para la Agencia Catalana del Agua.

 
 

 

LECTURA DE TESIS DOCTORAL: LAURA MARTINEZ PEREZ

Programa de doctorat: Enginyeria del Terreny

Nom del doctorand/a: LAURA MARTÍNEZ PÉREZ

Data de la defensa de tesi: 09/07/2020

Títol de la tesi doctoral: Characterization of seawater intrusion and submarine groundwater discharge in alluvial coastal aquifers: field and laboratory approach

Modalitat: Videoconferència

Enllaç videoconferència: https://meet.google.com/bzg-uhqo-jyi

Hora d’inici (hora local): 10:00 h

Abstract

Seawater intrusion (SWI) causes not only salinization of coastal aquifers, but also a reduction submarine groundwater discharge (SGD) and nutrient fluxes to marine ecosystems. We have developed a small scale experimental field site to gain insights into both SWI and SGD. The site is located in a coastal alluvial aquifer at the mouth of an ephemeral stream in the Maresme coastline (Barcelona, Spain). Here, we describe our attempts for a detailed site characterization, which was based on the four pillars of hydrogeology: geology (Lithological description and geochemical analysis of core), geophysics (borehole logs, Electrical Resistivity Tomography and thermal monitoring), hydraulics (pumping and tidal response tests) and hydrochemistry (major and minor elements, stable isotopes and Radium isotopes for SGD assessment).

 

As it turned out, all four pillars yielded some surprise. The aquifer consists of alluvial sediments, rather than coastal plain deposits. Tidal loading, rather than hydraulic connection to the sea, appears to drive tidal response, in spite of the aquifer being unconfined. Hydrochemistry suggests an unusually reactive layer, with all cations reflecting some mineral dissolution process, beyond the expected cation exchange. Radium increased with salinity, but the correlation was poor, partly blurred by pH, which was low in the deep portions of the aquifer. These observations were largely explained with the help of geophysics. Both borehole logs and cross-hole ERT helped in identifying silt layers that are frequent in alluvial deposits but proved to play a critical role here. The integration of the different techniques allowed to characterize the different distribution of salt- and fresh- groundwater, that in fact yielded an inverse disposition to what is expected in coastal hydrogeology.

 

To improve SGD quantification, we also characterized radium behavior within the aquifer. The recovered sediment during borehole drilling was used to perform both batch and column laboratory experiments. We performed constant salted fluid injections but we also vary the salinity (SWI and SGD simulation) to infer adsorbed Ra from its mobilization. Column experiments were later simulated using a 0D model to interpret the results. We have observed that heterogeneous flux through preferential flow paths occurs in the columns. Variations in these flow paths may explain the observed fluctuations. Such variations may also occur during the freshening and salinization experiments, but the changes in sorption are so dominant that overcome the impact of changes in porosity structure.

Ponencia: Dispersion upscaling in highly heterogeneous aquifers: The prediction of tracer dispersion at the Macrodispersion Experiment (MADE) site

Ciclo de webinars gratuitos en Hidrogeología y Geoquímica
TODOS LOS JUEVES en directo en: https://meet.google.com/snb-qdkn-eex   
 
Link de la presentación: Presentation_Dispersion_upscaling_1
GRUPO DE HIDROLOGÍA SUBTERRÁNEA
(Unidad asociada CSIC-UPC)

 

Esta semana: Jueves 02 de Julio a las 12:15h
 
Ponente: Marco Dentz. Profesor de Investigación CSIC
Ponencia: Dispersion upscaling in highly heterogeneous aquifers: The prediction of tracer dispersion at the Macrodispersion Experiment (MADE) site
Marco Dentz, Alessandro Comolli, Vivien Hakoun, and Juan Hidalgo
 
Abstract
We derive an upscaled model for the prediction of the plume evolution in highly heterogeneous aquifers based a stochastic transport representation in terms of continuous time random walks. Transport is modeled
through advective motion of idealized solute particles, which changes their speed at fixed distances. The series of particles speeds is modeled as a stationary Markov chain. The derived model is parameterized by the
correlation length, mean and variance of the log-hydraulic conductivity, the mean hydraulic gradient and porosity. Furthermore, it can be conditioned on the conductivity and tracer data at the injection region. 
The model predicts the main features of the non-Fickian evolution of the longitudinal concentration profile observed during the MADE-1 and MADE-2 experiments. The mass distribution is characterized by strong localization at the injection region and
a strong forward tail. These features are explained by heterogeneity of hydraulic conductivity heterogeneity, and the correlated motion of particles according to spatially persistent Lagrangian flow speeds.
 

Ponencia: A Matlab®-based toolbox for Geological Sequestration of CO2

Ciclo de webinars gratuitos en Hidrogeología y Geoquímica
 
 
TODOS LOS JUEVES en directo en: https://meet.google.com/snb-qdkn-eex   
Presentación on line: Yufei_Wang_Webinar
 
GRUPO DE HIDROLOGÍA SUBTERRÁNEA
(Unidad asociada CSIC-UPC)

 

Esta semana: Jueves 18 de Junio a las 12:15h
 
Ponente: Yufei Wang. PhD Student


Abstract:
Carbon Capture and Sequestration (CCS) is a feasible technique to mitigate the global climate change due to temperature increase. This
research focuses on geological CO2 sequestration. A Matlab®-based toolbox is developed to simulate the CO2-Brine system during the
injection of supercritical CO2 into subsurface saline formation. In the process, we consider the evaporation of H2O into CO2-rich phase as well
as the dissolution of CO2 into the brine phase. The numerical model is thus a Compressible-Reactive Two-phase flow model.
This seminar concentrates on how to build the numerical model and how to solve the numerical model. Detailed information, such as constitution
equations, will be discussed. Some methods  for improving on the numerical solution are proposed. Some preliminary results will be shown
 
 

Webinar: Where do Rare Earth Elements spend the summer?

TODOS LOS JUEVES en directo en: https://meet.google.com/snb-qdkn-eex   

Visualización de la presentación: Carlos Ayora_Webinar

GRUPO DE HIDROLOGÍA SUBTERRÁNEA

(Unidad asociada CSIC-UPC)

 Esta semana: Jueves 11 de Junio a las 12:15h

Ponente: CARLOS AYORA IBAÑEZ. Profesor de Investigación CSIC

Ponencia: Where do Rare Earth Elements spend the summer?

Abstract:
Acid mine drainages (AMD) are very enriched in Rare Earth Elements (REE) compared with other natural waters. The REE remain in solution until the acid stream is neutralized in treatment systems or by mixing with an alkaline river or the ocean. In the dry season of Mediterranean climates, acid streams dry off leaving behind a mixture of efflorescent sulfate salts. The fate of REE during evaporation was investigated by sampling and analyses of sulfates resulting from six AMD samples, and the principal component analysis (PCA) of the results. Light REE were clearly related to Ca (PCA1) whereas Heavy REE seemed associated with Al (PCA2). On the contrary, no relationship was found with Fe and Mg sulfates (PCA3). The REE distribution between PCA1 and PCA2 matches beautifully the ionic radius of each ion in the octahedral configuration. It is, therefore, initially concluded that Light REE replace Ca in gypsum, whereas Heavy REE might replace Al in alunogen, although in progress experiments must confirm/deny this conclusion. The results could be relevant to concentrate REE from AMD with very soft chemistry.

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