A coupled CFD-DEM model for sand production in oil wells 

    Climent Pera, Natalia (Date of defense: 2016-10-17)

    During the oil recovery a hole is drilled, the sandstone is left unsupported next to the cavity and disloged sand grains can enter the oil recovery system. This process is called sand production and several problems may ...

    A double-porosity formulation for the THM behaviour of bentonite-based materials 

    Vasconcellos, Ramon Barboza de (Date of defense: 2021-05-18)

    The thermo-hydro-mechanical (THM) behaviour of expansive clays has been extensively studied in the last decades due to the potential use of bentonites as components of engineered barrier systems (EBS) in deep geological ...

    A methodology to assess the combined effect of climate change and groundwater overexploitation over the Upper Guadiana basin, Spain 

    Sapriza Azuri, Gonzalo (Date of defense: 2013-12-20)

    There is a growing concern about the combined effect of climate change and groundwater overexploitation on the availability of water resources in the Upper Guadiana basin (UppGb) in central Spain. General Circulation Models ...

    Advanced exploitation of Sentinel-1 data for supporting landslide risk analysis 

    Barra, Anna (Date of defense: 2022-04-22)

    Satellite Synthetic Aperture Radar Interferometry (InSAR) and Persistent Scatterer Interferometry (PSI) are now consolidated tools for ground movement detection and monitoring. Sentinel-1 (S1) is the first satellite providing ...

    Advanced image analysis techniques for laboratory experiments on soils 

    Parera Morales, Ferran (Date of defense: 2020-01-27)

    The understanding of soil behavior is the foundation where the geotechnical engineering is built on. Experimentation is essential to improve this comprehension, and then to be able to translate it into models, theories, ...

    Advancing in the characterization of coastal aquifers : a multimethodological approach based on fiber optics distributed temperature sensing 

    Del Val Alonso, Laura (Date of defense: 2020-06-03)

    Detailed characterization of coastal aquifers is essential for proper management of coastal groundwater resources, and coastal areas in general. Still, there is a general lack of systematic monitoring and detailed ...

    An approach for hydrogeological data management, integration and analysis 

    Criollo Manjarrez, Rotman A. (Date of defense: 2019-03-08)

    The conceptualisation of a groundwater system involves continuous monitoring and evaluation of a large number of parameters (e.g., hydraulic parameters). Regarding hydraulic properties of the aquifers, their quantification ...

    Analyse multi-échelle de l'approche énergétique de la rupture des grains au sein de matériaux granulaires 

    Salami, Younes (Date of defense: 2017-01-11)

    Au cours des dernières années, les analyses multi-échelles en mécanique des sols granulaires deviennent de plus en plus répandues. L’avantage de ce type d’approches réside dans leur capacité à établir un lien entre les ...

    Análisis THM de la interacción suelo-atmósfera en suelos arcillosos sometidos a desecación 

    Cuadrado Cabello, Agustín (Date of defense: 2019-03-07)

    Coupled processes between the soil and the atmosphere control soil water evaporation in its first stage, which leads to soil shrinkage and cracking by drying. However, soil-atmosphere interaction has received little attention ...

    Anomalous dynamics of Darcy flow and diffusion through heterogeneous media 

    Russian, Anna (Date of defense: 2013-03-01)

    This thesis studies diffusion phenomena in heterogeneous media, which includes Darcy flow and diffusive solute transport in geological media. Natural media are heterogeneous at different scales, which induces complexity ...

    Assessment of a groundwater system under global change scenarios: the case of Kwale (Kenya) 

    Ferrer Ramos, Núria (Date of defense: 2019-07-18)

    One of the main drivers of the current global change is the climate change characterized by increased number and increased length of drought periods. Another relevant driver that will imply greater pressure on natural ...

    Assessment of the magnitude-frequency relationship of landslides and rockfalls : application to hazard mapping 

    Domènech i Surinyach, Guillem (Date of defense: 2015-10-14)

    Due to the exponential grown of the population within the last decades, the landslide hazard assessment of earthflows and rockfalls and their hazard mapping have become an essential tool for the territory management, mostly ...

    Caracterización hidrogeoquímica del macizo de Betancuria. Fuerteventura, Archipiélago de Canarias 

    Herrera Lameli, Christian (Date of defense: 2001-07-06)

    La Isla de Fuerteventura se sitúa en el borde oriental del Archipiélago de Canarias, a sólo 100 km del continente africano. Presenta un relieve topográfico relativamente suave respecto a las otras islas del Archipiélago, ...

    Comportamiento hidro-mecánico de agregados gruesos 

    Alvarado de Menéndez, Clara Elena (Date of defense: 2017-05-18)

    Rockfill is a coarse material widely used in geotechnical works such as earth-fill dams (shoulders and toe drains), as well as in embankments and well-graded quarry materials for railway infrastructures. These structures ...

    Cone penetration test in a virtual calibration chamber 

    Butlanska, Joanna (Date of defense: 2014-07-21)

    Cone penetration test (CPT) is a fast and reliable site investigation tool for exploring soils and soft ground. While the interpretation of the test results in clay has advanced considerably from a theoretical and numerical ...

    Coupled heat and water flow dynamics in dry soils : application to a multilayer waste cover 

    Gran Esforzado, Meritxell (Date of defense: 2015-05-27)

    Unsaturated flow plays an important role in numerous environmental phenomena. It is complex in arid regions, where liquid water fluxes are small and vapor fluxes become relevant, so that heat, water and solute mass transport ...

    Determinación de un geoide de alta precisión en áreas de pequeña extensión. Aplicación en el parque nacional de Doñana 

    Núñez Andrés, M. Amparo (María Amparo) (Date of defense: 2006-11-10)

    The following dissertation partially gathers the research carried out within two projects of the DGICyT (Dirección General de Investigación Científica y Técnica, Spanish Government Department for Scientific and Technical ...

    Dinámica y peligrosidad de las corrientes de derrubios : aplicación en el barranco de Erill, Pirineo catalán 

    Raïmat Quintana, Carles (Date of defense: 2018-07-23)

    Debris flows are one of the most dangerous mass movements in mountainous regions, but with many outstanding issues on hydrological conditions, mechanisms triggering, dynamic flow and mitigation measures. This work in the ...

    Dissolved CO2 effect on the reactivity of the Hontomín reservoir rocks (limestone and sandstone) 

    García Ríos, María (Date of defense: 2015-03-13)

    A test site for CO2 geological storage is situated in Hontomín (Burgos, northern Spain) with a reservoir rock that is mainly composed of limestone (80-85%) and sandstone (15-20%). The reservoir rock is a deep saline aquifer ...

    Effect of thermal cycles on rock massif stability 

    Villarraga Díaz, Claudia Juliana (Date of defense: 2018-02-28)

    The environmental conditions may play a relevant role in the stability of rock slopes. In fact, weathering can contribute to the reduction of strength of the material, while atmospheric actions may increase internal stresses ...