A5037354081- Landslides and related hazards
- Rock Mechanics and Modeling
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Cryospheric studies and observations
- GNSS positioning and interference
- Geophysics and Gravity Measurements
- Geotechnical Engineering and Analysis
- Soil and Unsaturated Flow
- Geotechnical Engineering and Soil Mechanics
- Soil Moisture and Remote Sensing
- Geotechnical Engineering and Underground Structures
- 3D Surveying and Cultural Heritage
- Geotechnical Engineering and Soil Stabilization
- Hydrology and Sediment Transport Processes
- Tunneling and Rock Mechanics
- Geophysical Methods and Applications
- Structural Health Monitoring Techniques
- Geological and Geophysical Studies Worldwide
- Geotechnical and Geomechanical Engineering
- Granular flow and fluidized beds
- Inertial Sensor and Navigation
- Flood Risk Assessment and Management
- Karst Systems and Hydrogeology
- Seismic Waves and Analysis
- Coastal and Marine Dynamics
Universitat Politècnica de Catalunya
2013-2023
University of Girona
2021
Polytechnic University of Puerto Rico
2008
In this paper, a new model-based technique for the compensation of severe height-dependent atmospheric artifacts, using ground-based synthetic aperture radar (SAR) data over mountainous regions, is proposed. The method presented represents an extension already existing techniques, but now taking into account effect steep topography in phase screen process. addition, adapted to work with polarimetric SAR data, showing, that case, noticeable improvement validated environment El Forn de...
The particle sizes in large rockfill structures such as dams prevent laboratory testing. prediction of field behaviour requires the development models that integrate size effects. A distinct element method model was developed which grains are characterised by aggregations a maximum 14 elementary spherical particles (the resulting shape approaches real geometries and allows reasonable breakage evolution) criterion involves subcritical propagation fissures grain. Time effects included through...
Abstract. This paper describes the deformation monitoring of Vallcebre landslide (Eastern Pyrenees, Spain) using Differential Interferometric Synthetic Aperture Radar (DInSAR) technique and corner reflectors (CRs). The fundamental aspects this satellite-based are described to provide key elements needed fully understand correctly interpret its results. Several technical logistic related use CRs addressed including an analysis suitability DInSAR data monitor a specific landslide, discussion...
Particle crushing has been introduced into a discrete model for rockfill aggregates by novel approach which combines closed-form solution stress distribution inside particles and crack propagation criterion derived from fracture mechanics concepts. Two breakage modes are simulated: local contact an equal volume splitting. The occurrence of both derives experimental observations. Three main parameters control the performance: stiffness, basic friction angle particle material toughness....
Prior to the application of any persistent scatterer interferometry (PSI) technique for monitoring terrain displacement phenomena, an adequate pixel selection must be carried out in order prevent inclusion noisy pixels processing. The rationale is detect so-called scatterers, which are characterized by preserving their phase quality along multi-temporal set synthetic aperture radar (SAR) images available. Two criteria mainly available estimation pixels’ quality, i.e., coherence stability and...
Abstract Fragmentation is a common feature of rockfall that exerts strong control on the trajectories generated blocks, impact energies, and runout. In this paper, we present set four real-scale tests aimed at studying fragmentation rocky from global design field procedure to data analysis main results. A total 124 limestone, dacite, or granite blocks ranging between 0.2 5 m 3 were dropped different heights (8.5 23.6 m) onto slopes with shapes (single double bench) slope angles (42º 71º)....
Abstract A discrete model for unsaturated granular soils has been developed. Three entities have defined: particles, water menisci and pores. Local interaction forces transfer mechanisms integrated into a through the appropriate equilibrium balance equations. The results of several numerical tests using this described discussed. Simulations include wetting drying under load tests, application suction cycles effect deviatoric stress ratio on wetting‐induced collapse. reacts just as true soil...
Quantitative hazard analysis of rockfalls is a fundamental tool for sustainable risk management, even more so in places where the preservation natural heritage and people’s safety must find right balance. The first step consists determining magnitude-frequency relationship, which corresponds to apparently simple question: how big often will rockfall be detached from anywhere cliff? However, there usually only scarce data on past activity derive quantitative answer. Methods are proposed...
Landslides are one of the most common and dangerous threats in world that generate considerable damage economic losses. An efficient landslide monitoring tool is Differential Synthetic Aperture Radar Interferometry (DInSAR) or Persistent Scatter (PSI). However, landslides usually located mountainous areas area interest can be partially even heavily vegetated. The inherent temporal decorrelation dramatically reduces number Scatters (PSs) scene limits practice application this technique. Thus,...
In this paper, we present the upgraded version of RockGIS, a stochastic program for numerical simulation rockfalls and their fragmentation, based on fractal model. The code has been improved to account range fragmentation scenarios, depending impact conditions. simulation, parameters model that define sizes generated fragments were computed at each according kinematic performance was verified validated by real-scale rockfall tests performed in quarry. consisted release 21 limestone blocks....
Abstract. In the last decade, ground-based interferometry has proven to be a powerful technique for continuous deformation monitoring of landslides, glaciers, volcanoes, or manmade structures, among others. However, several limitations need addressed in order improve performances technique, especially long-term monitoring. These include reduction measurable points with an increase period observation, ambiguous nature phase measurements, and influence atmospheric component. this paper, new...
Real-scale fragmentation tests provide high quality data in order to study the pattern of rock blocks. In carried out, initial mass, terms both volume and shape, was reconstructed by means 3D photogrammetry. The fragments size distribution bocks tested measured hand using a tape. drop were performed four different sites, releasing total 124 blocks measuring 2907 fragments. obtained fragment distributions may be well fitted power laws. survival rate (Sr), which is proportion remaining block...
In the last two decades, both amount and quality of geoinformation in geosciences field have improved substantially due to increasingly more widespread use techniques such as Laser Scanning (LiDAR), digital photogrammetry, unmanned aerial vehicles, geophysical reconnaissance (seismic, electrical, geomagnetic), ground-penetrating radar (GPR), among others. Furthermore, advances computing, storage visualization resources allow acquisition 3D terrain models (surface underground) with...
Works carried out to monitor the displacements of Vallcebre landslide (Pyrenees range, NE Spain) since 1987 are presented. The landslide, which extends over an area about 0.8 km2 and affects more than 20 × 106 m3, has experienced up one meter per year in some points periods. It been periodically monitored 1987, using a wide range surface in-hole techniques: triangulation with theodolite, Terrestrial Photogrammetry, Electronic Distance Measurement, GNSS-GPS, inclinometers, wire extensometers,...