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UPC: C/ Jordi Girona 31, (08034 - Barcelona) - IDAEA: C/ Jordi Girona 18-26, (08034 - Barcelona)

Eventos y Seminarios

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Formación, cursos, eventos y seminarios

Geochemistry of rare earth elements in acid mine drainage

a cargo de: Carlos Ayora. Profesor de Investigación IDAEA

Día: Jueves 20 de Junio a las 12:15 h

Lugar: Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja


Abstract:

The REE concentrations in AMD are several orders of magnitude higher than the rest of surface waters and could be a future supplementary source of some highly valuable REE.  Precipitation of schwertmannite and to basaluminite occurs due to mixing of acid (and REE-rich) and alkaline streams.  The REE fractionation between AMD and the solid phases has been investigated in several localities from the Odiel-Tinto (SW Spain) and Arroyo del Val (N Spain) basins. The behavior of REE during the mixing is conservative at low pH (pH<3), whereas they are scavenged by the flocculates at near neutral pH. The validity and limitations of a recently proposed thermodynamic model of REE sorption on schwertmannite and to basaluminite has been tested by comparing its predictions with the observations made. Finally, some observations suggest that Sc behaves differently from the rest of REE. According to the model, sorption of Sc onto schwertmannite at pH lower than 4 could also occur. . As a practical consequence, REE are preferentially accumulated in the basaluminite sludge of AMD treatments, but a significant fraction of Sc from the AMD can be also found in the schwertmannite residue.

The main factors influencing the presence of faecal bacteria pollution in groundwater systems in developing countries  


SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA
(UPC-CSIC)

 

A cargo de: Nuria Ferrer Ramos - PhD Student


Dia: Jueves 13 de Junio

Hora:a las 12:15 h
en 

 


Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja


Abstract:

Groundwater is the major source of drinking water in most African and Asian rural areas. This resource is threatened by the potential presence of faecal bacteria through a variety of sources and pollution paths, including septic tanks, landfills, and crop irrigation with untreated, or insufficiently treated, sewage effluent. Accurately assessing the microbiological safety of water resources is essential to reduce diseases caused by waterborne faecal exposure. The objective of this seminar is to present which are the most significant sanitary, hydrogeological, geochemical and physical variables influencing the presence of faecal bacterial pollution in groundwater by means of statistical multivariate analyses. The concentration of Escherichia coliwas measured in a number of waterpoints of different types in a rural area located in the coast of Kenya, separating the effects of the dry and wet season

Heat, Vapor and Sunshine: Explaining Fluctuations of Soil Water Content


SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA
(UPC-CSIC)

 

A cargo de: Maarten Saaltink
 

Dia: Jueves 06 de Junio
Hora:a las 12:15 h
Lugar: Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja


Abstract:

Daily temperature oscillations can cause fluctuations in the amount of water retained in a soil. These fluctuations can be measured by high precision weighing lysimeters. We analyzed the data of a lysimeter in a sandy dune sediment in Southern Spain by means of unsaturated thermo-hydraulic numerical models which considers water, vapor and heat transport in the soil as well as soil-atmosphere interactions such as precipitation, evaporation and solar radiation. The analysis shows that daily temperature oscillations, psychrometrics and soil water retention can explain the fluctuations of the amount of liquid water in the soil. The retention curve, especially its driest part, is essential for the existence of these fluctuations. The fluctuations could not be reproduced by a model using the van Genuchten retention curve with a constant residual saturation. On the other hand, satisfactory results could be obtained by models using retention curves that at their driest part still show a change of saturation with suction. Moreover, the models suggest within the top few decimeters of the soil a pattern of alternating bands of condensation and evaporation, which follows the daily temperature oscillations that fade out deeper in the soil. 

 

Laboratory Experiments to Evaluate the Joint Effect Between Heterogeneity and head fluctuation on mixing, effective porosity and tailing

DEFENSA TESI DOCTORAL - DEFENSA TESIS DOCTORAL - PhD THESIS DEFENSE

Laboratory Experiments to Evaluate the Joint Effect Between Heterogeneity and head fluctuation on mixing, effective porosity and tailing”
SR. EDUARDO FRANCISCO CASTRO ALCALÁ

 Directors:

  1. JESÚS CARRERA RAMÍREZ / DR. DANIEL FERNÁNDEZ GARCÍA



 

DIJOUS, 30 MAIG – JUEVES, 30 MAYO - THURSDAY, MAY 30th (2019)

12.00 H.

Sala 002, Edifici C1, Campus Nord de la UPC

Enhanced oil recovery with chaotic flow 

SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA (UPC-CSIC)

 

A cargo de: Yufei Wang (PhD Student)

Dia: Jueves 23 de Mayo
Hora: a las 12:15 h
Lugar: Departamento de Ingeniería Civil y Ambiental, Modulo D2-Aula CIHS, Planta Baja


Abstract:
A new enhanced oil recovery method, which is based on chaotic flows, is proposed. As new oil reservoirs are difficult to find, enhancing the oil recovery of currently available oil reservoirs is a hot topic in the petroleum industry. Here, chaotic flow is employed to increase the oil productivity through promoting the sweep efficiency. Because the field may exhibit different permeabilities in different directions, oil may be trapped if it is displaced from the direction of low permeability. We demonstrate that by periodically changing the flow direction we can increase the probability that waterflooding displaces the oil from the more permeable direction, so that trapped oil can be displaced by a resourceful flooding. Using a finite difference method, we simulate two typical two-dimensional test cases: a five-spot pattern in isotropic field, and an anisotropic field with four injectors and five producers. Three different mobility ratios are used to simulate the effect of mobility ratio on chaotic flows. Importantly, an optimal chaotic flow frequency is demonstrated to exist for which the oil recovery is maximum. A preliminary result shows that chaotic flows can increase the net profit up to 16%, with an increased sweep efficiency up to 18%. 

Anomalous dispersion in porous and fracturedcmedia and the stochastic dynamics of intermittent particle motion

SEMINARIO GRUPO DE HIDROLOGIA SUBTERRÁNEA (UPC-CSIC)

 

A cargo de: Marco Dentz

Dia: Jueves 16 de mayo

Hora:a las 12:15 h

Lugar: Departamento de Ingeniería Civil y Ambienta, Modulo D2-Aula CIHS, Planta Baja

Abstract:

Transport in the flow through fractured and porous media is in general anomalous. This means, first passage time distributions show heavy tails, the centered mean square displacement evolves non-linearly, and propagators are non-Gaussian. The origin of these behaviors lies in the spatial heterogeneity inherent to natural and engineered porous media. Experimental and numerical data for particle dynamics in flows through porous and fractured media show intermittent patterns in Lagrangian velocities and accelerations. This phenomenon is closely related to the occurrence of anomalous dispersion and can be traced back to the spatial persistence of particle velocities on heterogeneity length scales engraved in the heterogeneous medium structure. In order to systematically quantify these intermittent stochastic particle dynamics and to upscale the anomalous large scale particle motion, we focus on the analysis of Lagrangian velocities sampled equidistantly along particle trajectories. This procedure removes the intermittency observed under isochronous sampling. The equidistant Lagrangian velocity series are quantified by an ergodic Markov process that is continuous in distance along the streamline. The steady state velocity distribution is related to the Eulerian velocity distribution by flux-weighting, which is a consequence of the solenoidal character of the flow field and the equidistant sampling protocol. This approach renders the stochastic particle motion as a continous time random walk whose time increments are correlated at subsequent steps. The corresponding joint distribution of particle position and velocity is governed by a Boltzmann-type equation. We employ here an Ornstein-Uhlenbeck process for the evolution of the normal scores of the equidistant particle velocities. The resulting upscaled model predicts anomalous transport features as well as intermittent flow patterns as quantified by the distribution of velocity increments and accelerations at the pore, Darcy and regional scales.

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