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  • Interferometric SAR monitoring of the Vallcebre landslide (Spain) using corner reflectors

     Crosetto, Michele; Gili Ripoll, Jose Antonio; Montserrat, Oriol; Cuevas Gonzalez, Maria; Corominas Dulcet, Jordi; Serral, David
    Natural hazards and earth system sciences
    Date of publication: 2013
    Journal article

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    This paper describes the deformation monitoring of the Vallcebre landslide (Eastern Pyrenees, Spain) using the Differential Interferometric Synthetic Aperture Radar (DInSAR) technique and corner reflectors (CRs). The fundamental aspects of this satellite-based deformation monitoring technique are described to provide the key elements needed to fully understand and correctly interpret its results. Several technical and logistic aspects related to the use of CRs are addressed including an analysis of the suitability of DInSAR data to monitor a specific landslide, a discussion on the choice of the type of CRs, suggestions for the installation of CRs and a description of the design of a CR network. This is followed by the description of the DInSAR data analysis procedure required to derive deformation estimates starting from the main observables of the procedure, i.e., the interferometric phases. The main observation equation is analysed, discussing the role of each phase component. A detailed discussion is devoted to the phase unwrapping problem, which has a direct impact on the deformation monitoring capability. Finally, the performance of CRs for monitoring ground displacements has been tested in the Vallcebre landslide (Eastern Pyrenees, Spain). Two different periods, which provide interesting results to monitor over time the kinematics of different parts of the considered landslide unit, are analysed and described.

  • Non-interferometric GB-SAR measurement: application to the Vallcebre landslide (eastern Pyrenees, Spain)

     Monserrat, Oriol; Moya Sanchez, Jose; Luzi, G.; Crosetto, Michele; Gili Ripoll, Jose Antonio; Corominas Dulcet, Jordi
    Natural hazards and earth system sciences
    Date of publication: 2013
    Journal article

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    In the last decade, ground-based interferometry has proven to be a powerful technique for continuous deformation monitoring of landslides, glaciers, volcanoes, or man-made structures, among others. However, several limitations need to be addressed in order to improve the performances of the technique, especially for long-term monitoring. These limitations include the reduction of measurable points with an increase in the period of observation, the ambiguous nature of the phase measurements, and the influence of the atmospheric phase component. In this paper, a new procedure to process the amplitude component of ground-based synthetic aperture radar (GB-SAR) data acquired in discontinuous mode is compared and validated. The use of geometric features of the amplitude images combined with a matching technique will allow the estimation of the displacements over specific targets. Experimental results obtained during 19 months, in eight different campaigns carried out in the active landslide of Vallcebre (eastern Pyrenees, Spain), were analysed. During the observed period, from February 2010 to September 2011, displacements up to 80 cm were measured. The comparison with other surveying technique shows that the precision of the method is below 1 cm.

  • Implementation of marine altimeter calibration campaign in the area of Ibiza island

     Martinez Benjamin, Juan Jose; Lopez Bravo, Rogelio; Pérez Gómez, Begoña; Gili Ripoll, Jose Antonio; Tapia Gomez, Ana Maria; Gonzalez Gonzalez, Juan Carlos; Sanz Conde, M. Mercedes; Gracia Gomez, Carlos
    European Space Agency Living Planet Symposium
    Presentation's date: 2013
    Presentation of work at congresses

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    The presentation is directed mainly to the description of the actual situation of the Ibiza site in preparation for a new altimeter calibration marine campaign of Jason-2 and Sara/AltiKa satellites to be made in september 2013. A description of the two geometric levelling campaigns made in June and September 2013 is included

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    Geodetic infrastructure in the Ibiza and Barcelona harbours for sea level monitoring  Open access

     Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Pérez Gómez, Begoña; Gracia Gomez, Carlos; Pros Llavador, Francesc; Palau Teixidó, Vicenç
    American Geophysical Union Fall Meeting
    Presentation's date: 2013-12
    Presentation of work at congresses

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    The presentation is directed to the description of the actual situation and relevant information of the geodetic infrastructure of Ibiza and Barcelona sites for sea level determination and contribution to regional sea level rise. Time series are being analysed for mean sea level variations www.puertos.es. .In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge Datamar 2000C from Geonica s.l. near an acoustic tide gauge. Puertos del Estado installed in 2007 a MIROS radar tide gauge and the Barcelona Harbour Authority a GPS referente station in the roof of the new Control Tower situated in the Energy Pier. The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e-mail. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Precision levelling has been made several times in the last two years because the tower is founded in reclaimed land. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. A description of the actual infrastructure at Ibiza harbour at Marina de Botafoch, is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. It is described the geometrical precision levelling made in June 2013 between the radar tide gauge and the GPS station. In particular, the CGPS located at Ibiza harbour is essential for its application to the marine campaign Baleares 2013, near Ibiza island. The main objective is to determine the altimeter bias for Jason-2, about 9:09 UTC September 15, 2013, and Saral/AltiKa, about 05:30 UTC September 16, UTC. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish National Project CGL2009-13435/CLI.

    The presentation is directed to the description of the actual situation and relevant information of the geodetic infrastructure of Ibiza and Barcelona sites for sea level determination and contribution to regional sea level rise. Time series are being analysed for mean sea level variations www.puertos.es. .In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge Datamar 2000C from Geonica s.l. near an acoustic tide gauge. Puertos del Estado installed in 2007 a MIROS radar tide gauge and the Barcelona Harbour Authority a GPS referente station in the roof of the new Control Tower situated in the Energy Pier. The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e-mail. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Precision levelling has been made several times in the last two years because the tower is founded in reclaimed land. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. A description of the actual infrastructure at Ibiza harbour at Marina de Botafoch, is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. It is described the geometrical precision levelling made in June 2013 between the radar tide gauge and the GPS station. In particular, the CGPS located at Ibiza harbour is essential for its application to the marine campaign Baleares 2013, near Ibiza island. The main objective is to determine the altimeter bias for Jason-2, about 9:09 UTC September 15, 2013, and Saral/AltiKa, about 05:30 UTC September 16, UTC. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish National Project CGL2009-13435/CLI.

  • Deformation monitoring of the Control Tower, Port of Barcelona (Spain)

     Tapia Gomez, Ana Maria; Lopez Bravo, Rogelio; Gili Ripoll, Jose Antonio; Martinez Benjamin, Juan Jose; Pros Llavador, Francesc; Palau, Vicenç
    Joint International Symposium on Deformation Monitoring
    Presentation's date: 2013-09
    Presentation of work at congresses

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    The Control Tower of the Port of Barcelona is situated in the North dike of the so-called Energy Pier in the Barcelona harbor (Spain). This tower has different kind of antennas for navigation monitoring and a GNSS permanent station. As the tower is founded in reclaimed land, and because its metallic structure, the 50 m building is subjected to diverse movements, including periodic fluctuations due to temperature changes. In this contribution the 2009, 2011 and 2012 monitoring campaigns are described, specially an `ad hoc¿ solution to reach the roof of the tower by means of a vertical steel calibrated tape. In the works, GPS positioning and clinometers have been used as well. The measured settlement rate in the NE of the Energy Pier area is about 1 cm/year. Horizontal movements in the top of the Tower are in the range of +-4 mm. These are not extreme figures, but they mask the values registered by a tide gauge nearby or by the GNSS Permanent Station in the Tower roof. So, it is mandatory to carefully monitor these Stations periodically, especially in elevation.

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    Baleares 2013 Calibration Campaign for Jason-2 and Saral/AltiKa  Open access

     Martinez Benjamin, Juan Jose; Biancale, Richard; Martin Davila, José; Gárate Pasquín, Jorge; Pérez Gómez, Begoña; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Gracia Gomez, Carlos; Frappart, Frédéric; Roussel, Nicolas
    Ocean Surface Topography Science Team Meeting
    Presentation's date: 2013-10
    Presentation of work at congresses

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    A Baleares calibration campaign in Spanish-French cooperation is being prepared for mid September 2013 for the altimeters of Jason-2 and Saral/AltiKa in the Ibiza island area. A similar Spanish/French experience with Jason-1 was made in June 2003 in this geographical area under IBIZA 2003 campaign. In this local/regional campaign focusing in bias, we foresee to calibrate the altimeter of Jason-2 and Saral satellites by means of GPS buoys. 4 buoys will be used near a node from Jason-2 (September 15 about 9:38 in ascending track) and Saral (September 15 about 7:30 in ascending track) satellites to get the slope of the sea in along track and cross track directions, what is necessary to interpolate the exact nadir point of the satellite. It will be used Argos floating transmitters from CLS to be tied to the buoys with a long rope. We have thought over different configurations. The crossover point between Jason-2 and Saral North of Ibiza (around 40 nm) and West of Mallorca island seems to be optimal in order to have a comparable layout of buoys at the same place for both satellites, of couse at one day interval. This would allow moreover cross calibration between Jason2 and Saral. The GPS receivers will be at 1Hz. It will be used the CGPS at Ibiza harbour from Puertos del Estado. A description of the actual geodetic infrastructure of Ibiza site will be presented. This campaign Baleares 2013 is founded from the Ministerio de Ciencia e Innovacion of Spain under National Project I+D+i ref:CGL2009-13435/CLI.

  • Long term real scale experiment to assess the thermal effects on the deformation monitoring of buildings

     Gili Ripoll, Jose Antonio; Lantada Zarzosa, Nieves; Nuñez Andres, Maria Amparo; Lian, Zengzeng; Zabaleta Zenarrutzabeitia, Izturitz; Puig Polo, Carolina; Tamagnan, Damien; Alonso, Luis
    Joint International Symposium on Deformation Monitoring
    Presentation's date: 2013-09
    Presentation of work at congresses

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    New underground transportation infrastructures as subway and railway tunnels are increasingly being constructed under urban areas. These and other underground developments disturb the preexistent city constructions as monuments, buildings and other facilities. In the last decade several big underground infrastructures have been constructed, for example in London, Amsterdam, Paris, Beijing, Shangai, etc. In the city of Barcelona (Spain) a new 44 km subway line and the High Speed Railway city crossing were built.

  • DEM modeling of unsaturated rockfill: scale effects

     Tapias Camacho, Mauricio Alberto; Alonso Pérez de Agreda, Eduardo; Gili Ripoll, Jose Antonio
    Pan-American Conference on Unsaturated Soils
    Presentation's date: 2013-02
    Presentation of work at congresses

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    The large size of the particles in rockfill structures prevents the appropriate laboratory testing. Moreover, the humidity is a key point to explain changes in the long term deformability of rockfill. Therefore, prediction of field behavior requires the development of models that integrate size effects and humidity changes. The Distinct Element Method has been used to develop a numerical model that includes assemblies of several spherical particles in a pyramidal shape. These "macroparticles" break when a rupture criterion involving the subcritical propagation of cracks within grain is achieved. This propagation is a function of stress state, defect size and relative humidity. Size effects for particles ranging from 0.28 to 56 cm of average diameter have been investigated. The results were validated against some real oedometer tests. The present work demonstrates the capabilities of the method as an useful tool to extend the laboratory tests on gravels to the actual rockfill dimensions

  • Nivelación y control de movimientos de los mareógrafos hidrográficos del Port de Barcelona

     Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio
    Date: 2013
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  • Scale effects in rockfill behavior

     Alonso Pérez de Agreda, Eduardo; Tapias Camacho, Mauricio Alberto; Gili Ripoll, Jose Antonio
    Géotechnique Letters
    Date of publication: 2012-09
    Journal article

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    Monitoring sea level by tide gauges and GPS at Barcelona and Estartit harbours  Open access

     Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Bosch, Ernest; Perez, Begoña; Pros, Francesc
    European Geosciences Union General Assembly
    Presentation's date: 2012-04-25
    Presentation of work at congresses

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    The presentation is directed to the description of the actual situation of the geodetic infrastructure of Barcelona and l’Estartit sites for sea level determination and contribution to regional sea level rise

  • Monitoring sea level by tide gauges and GPS at Estartit and Barcelona sites for altimeter calibration campaigns

     Lopez Bravo, Rogelio; Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio; Tapia Gomez, Ana Maria; Bosch Llopart, Ernest; Pérez Gómez, Begoña; Pros Llavador, Francesc
    Years of Progess in Radar Altimetry
    Presentation's date: 2012-09
    Presentation of work at congresses

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  • Implementation of Barcelona, l'Estartit and Ibiza sites for altimeter calibration marine campaigns

     Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Perez, Begoña; Bosch, Ernest; Pros, Francesc
    American Geophysical Union Fall Meeting
    Presentation's date: 2012-12-06
    Presentation of work at congresses

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    A marine campaign to compute the sea surface data along the Spanish Mediterranean coastline and Balearic Islands is being prepared for 2013. Jason-2 (period ~10 days) and Saral/AltiKa (period of 35 days and expected launch in 2012) altimetric data and on-board GPS data will be used. Many GPS Buoy sessions along the ship route will be performed.Sea height estimates (instantaneous and mean sea levels) will be compared. Recently some geodetic improvements has been made in specific coastal spanish sites in the NW Mediterranean Sea for monitoring sea level. The goal is to maintain and improve the quality of the observation of the sea level change in the three sites. The information is coming from Puertos del Estado www.puertos.es L¿Estartit tide gauge has been co-located with geodetic techniques (GPS measurements of XU, Utilitary Network, and XdA, Levelling Network,) and it is tied to the SPGIC (Integrated Geodetic Positioning System of Catalonia) project of the Cartographic Institute of Catalunya (ICC). In the past three calibration campaigns for Topex/Poseidon and Jason-1 in March 1999, August 2000 and July 2002 near Cape of Begur. At Barcelona harbour there is one MIROS radar tide gauge belonging to Puertos del Estado (Spanish Harbours).The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e-mail. The information includes wave forescast (mean period, significant wave height, sea level, etc.This sensor also measures agitation and sends wave parameters each 20 min. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Bathymetric campaigns inside the harbour have been made. At Ibiza site new measurements and levelling between the GPS reference station and a Radar MIROS, both from Puertos del Estado, has been made recently. A calibration campaign for Jason-1 was made in June 2003 in the Ibiza area, main calibration site. The presentation is directed to the description of the actual situation of the geodetic infrastructure of Barcelona, l¿Estartit sites for sea level determination and complementing Ibiza site for a new altimeter calibration campaign of Jason-2 and Saral/AltiKa satellites to be made in 2013. Specifications of the new marine calibration campaign will be presented

  • Ensayo a escala real de varias técnicas geomáticas de monitorización de movimientos de edificios

     Lantada Zarzosa, Nieves; Nuñez Andres, Maria Amparo; Gili Ripoll, Jose Antonio; Buill Pozuelo, Felipe; Puig Polo, Carolina; Zabaleta Zenarrutzabeitia, Izturitz; Rodriguez Jordana, Juan; Luzi, G.; Cuevas, M.
    Congreso Iberoamericano de Geomática y Ciencias de la Tierra
    Presentation's date: 2012-10-17
    Presentation of work at congresses

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    Dentro del proyecto de I+D del Ministerio de Ciencia e Innovación “Aplicación de técnicas geomáticas a la monitorización de edificios. Efecto térmico” (GEOTERM), coordinado por la Universidad Politécnica de Cataluña, se realizó una prueba, con varias técnicas innovadoras para la monitorización de edificios: Interferometría Radar de Apertura Sintética Terrestre GBSAR (Ground-Based SAR, Synthetic Aperture Radar), cámara termográfica y Estación Total Motorizada Automática (ETMA). Esta información se contrastará con las medidas de temperatura de la estructura del edificio tomadas durante la observación. El ensayo, realizado en un edificio de hormigón armado de ocho plantas durante más de 24 horas, se ha realizado gracias a la colaboración del Instituto de Geomática y de Soldata Iberia, entidades promotoras y observadoras del proyecto. El análisis ha permitido evaluar el alcance, resolución, viabilidad y complementariedad de las diferentes técnicas. De este modo, se espera avanzar en el conocimiento acerca de la respuesta térmica diaria de los edificios. La comparación de esta respuesta con las mediciones registradas durante la monitorización, permitirá generar un modelo de comportamiento físico completo de edificios que explique dicho “efecto térmico”.

  • Nivelación de la estación GPS de la torre de control y del mareógrafo de la Autoridad Portuaria de Barcelona

     Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Gili Ripoll, Jose Antonio; Pros Llavador, Francesc; Martinez Benjamin, Juan Jose
    Congreso Iberoamericano de Geomática y Ciencias de la Tierra
    Presentation's date: 2012-10-18
    Presentation of work at congresses

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  • Aplicación de técnicas geomáticas en la monitorización automática de edificios. Análisis y evaluación del efector térmico

     Gili Ripoll, Jose Antonio; Nuñez Andres, Maria Amparo; Buill Pozuelo, Felipe; Puig Polo, Carolina; Prades Valls, Albert; Rodriguez Jordana, Juan; Lantada Zarzosa, Nieves
    Participation in a competitive project

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  • A comparison of robust polynomial fitting, global geopotential model and spectral analysis for regional¿residual gravity field separation in the Doñana National Park (Spain)

     Martín, Ángel; Nuñez Andres, Maria Amparo; Gili Ripoll, Jose Antonio; Anquela, A.B.
    Journal of applied geophysics
    Date of publication: 2011-10
    Journal article

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    Implementación CGPS y altimetría en los Puertos de Ibiza, l¿Estartit y Barcelona para monitorización del nivel del mar  Open access

     Martinez Benjamin, Juan Jose; Ruiz, A.; Bosch, Ernest; Martinez I Garcia, Marina; Martinez De Osés, Francisco Javier; Perez, Begoña; Rodríguez Velasco, G.; Pros Llavador, Francesc; Gili Ripoll, Jose Antonio; Tapia Gomez, Ana Maria; Lopez Bravo, Rogelio; Termens Perarnau, Assumpció; Ortiz Castelló, Miquel Angel
    Revista de teledetección
    Date of publication: 2011-12
    Journal article

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    Dos campañas aéreas con el LIDAR Optech ALTM-3025 del ICC (Instituto Cartogáfico de Cata- luña) fueron realizadas el 16 de Junio de 2007 de día con un Partenavia P-68 y el 12 de Octubre de 2007 de noche con un Cessna Caravan 208B. La validación posible de esta nueva tecnología LIDAR puede ser útil para suministrar medidas en áreas costeras, de unos 15 a 20 km desde la línea de costa, donde la altimetría radar por satélite da problemas severos debido al amplio haz («footprint») que abar- ca zona de tierra. La segunda campaña aerotransportada se realizó coincidiendo con el paso del saté- lite ICESat provisto de un láser altímetro. Se describe la situación actual de las infraestructuras CGPS en Ibiza, l¿Estartit y Barcelona así como sus aplicaciones a la monitorización del nivel del mar y ca- libración altimétrica. El objetivo principal es la integración de datos geodésicos espaciales, aero- transportados e in-situ para establecer áreas de calibración altimétrica en el Mediterráneo Occidental en el marco del estudio del Cambio Global

    Dos campañas aéreas con el LIDAR Optech ALTM-3025 del ICC (Instituto Cartogáfico de Cataluña) fueron realizadas el 16 de Junio de 2007 de día con un Partenavia P-68 y el 12 de Octubre de 2007 de noche con un Cessna Caravan 208B. La validación posible de esta nueva tecnología LIDAR puede ser útil para suministrar medidas en áreas costeras, de unos 15 a 20 km desde la línea de costa, donde la altimetría radar por satélite da problemas severos debido al amplio haz («footprint») que abarca zona de tierra. La segunda campaña aerotransportada se realizó coincidiendo con el paso del satélite ICESat provisto de un láser altímetro. Se describe la situación actual de las infraestructuras CGPS en Ibiza, l’Estartit y Barcelona así como sus aplicaciones a la monitorización del nivel del mar y calibración altimétrica. El objetivo principal es la integración de datos geodésicos espaciales, aerotransportados e in-situ para establecer áreas de calibración altimétrica en el Mediterráneo Occidental en el marco del estudio del Cambio Global. Two airborne calibration campaigns carrying an Optech Lidar ALTM-3025 (ICC) were made on June 16, 2007 with a Partenavia P-68 and October 12, 2007, with a Cessna Caravan 208B flying along two ICESat target tracks including crossover near l’Estartit. The validation of this new technology LIDAR may be useful to fill coastal areas where satellite radar altimeters are not measuring due to the large footprint and the resulting gaps of about 15-30 km within the coastline. The second airborne campaign was made at night at the same time of the ICESat overflying. A description of the actual geodetic CGPS (Continuos GPS) infrastructures at Ibiza, l’Estartit and Barcelona is presented as their applications to sea level monitoring and altimeter calibration. The main objective is the integration of spaceborne, airborne and in-situ data for the establishment of altimeter calibration areas in the western Mediterranean in the framework of Global Change.

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    Geodetic infrastructure in the Barcelona and l¿Estartit harbours for sea level monitoring  Open access

     Martinez Benjamin, Juan Jose; Bosch, Ernest; Pérez Gómez, Begoña; Martinez De Osés, Francisco Javier; Gili Ripoll, Jose Antonio; Tapia Gomez, Ana Maria; Gonzalez Gonzalez, Juan Carlos; Sanz Conde, M. Mercedes; Lopez Bravo, Rogelio; Pros Llavador, Francesc
    Ocean Surface Topography Science Team Meeting
    Presentation's date: 2011-10
    Presentation of work at congresses

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  • Simulating particle breakage and relative humidity effects in rockfill behaviour

     Alonso Pérez de Agreda, Eduardo; Tapias Camacho, Mauricio Alberto; Gili Ripoll, Jose Antonio
    International Symposium on Computational Geomechanics
    Presentation's date: 2011-04
    Presentation of work at congresses

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    The paper presents an analysis of the mechanical behaviour of rockfill using the discrete element method. A background reference is the set of results of a few large scale triaxial tests performed at the UPC geotechnical laboratory. In those tests Relative Humidity (RH) was controlled by means of a vapour equilibrium technique. RH is a fundamental aspect in the behaviour of rockfill which has received limited attention in the past. The Relative Humidity within the large pores between rock fragments controls the velocity of crack propagation within the particles. An increase in RH means faster crack propagation and eventually breakage of some particles and subsequent re-arrangement of the granular structure. The basic tool used to simulate some of the tests is the computer code PFC3D. Rockfill particles (they have the size of gravels, typically ranging from 1 cm to 4 cm) were simulated as breakable clusters of 3D balls. Particle breakage occurs in time according to fracture mechanic’s laws. In a parallel study, the development of cracks in time has been examined. This information was taken into account in the numerical analysis to derive criteria for particle breakage. The paper describes the preliminary results of the work in progress. The actual shape of rock gravels has been approximated by means of clusters of spherical particles. Several arrangements, comprising a different number of particles, have been numerically tested. The results of the modelling exercise are encouraging and test results are reasonably well reproduced. The model is fairly general and it has a number of interesting capabilities.

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    Primeros resultados de una red GPS de monitorización de asentamientos en la cuenca potásica catalana (N-E de España)  Open access

     Gili Ripoll, Jose Antonio; Lantada Zarzosa, Nieves; Concha Dimas, Aline; Soler, Xavier; Puig Polo, Carolina; Marturià, Jordi
    International Geomatic Week
    Presentation's date: 2011-03-17
    Presentation of work at congresses

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    En la parte central de Cataluña se encuentra la zona geológica conocida como la Cuenca Potásica Catalana, una potente formación de depósitos salinos, mayormente potásicos. Las capas subterráneas afloran superficialmente en diversos puntos (Cardona, Suria, Sallent etc), lo que ha hecho muy accesible su extracción, con actividades mineras que se remontan a la época romana. En el siglo XX aumentó la tasa de explotación, lo que produjo subsidencias importantes (hasta de algún metro en algunos puntos) cerca o afectando a algunos núcleos como los citados. En el año 2007 el Institut Geològic de Catalunya (IGC) estableció una red de monitorización de movimientos que venía a cubrir de manera amplia la parte Este de la Cuenca Potásica, complementando e integrando otras redes locales previas. 36 vértices han sido observados con métodos GPS de precisión por la empresa GPS-Global en tres épocas hasta el momento: Diciembre 2007, Noviembre 2008 y Noviembre 2010. En esta contribución se presentan: los trabajos de reparación/diseño de la red; y el postprocesado de los datos registrados en las dos primeras campañas. Se han probado cinco diferentes aproximaciones o estrategias de cálculo, basadas en otros tantos paquetes de software, con resultados compatibles entre si. Todos los puntos de la red presentan movimientos no significativos entre las dos campañas, excepto el vértice CK31 que ha experimentado una subsidencia de unos 9 cm. Se ha podido evaluar la precisión del dispositivo de monitorización; la estadística de los residuos nos permite estimar la desviación típica de los movimientos verticales en 1 cm, valor acorde con los equipos y método usado, y que satisface el objetivo de diseño de la red para monitorizar los movimientos generales de la Cuenca Potásica Catalana.

  • 2D atmospheric artifact compensation with multiple regression model in ground-based sar over mountainous areas

     Fabregas Canovas, Francisco Javier; Iglesias González, Rubén; Aguasca Sole, Alberto; Gili Ripoll, Jose Antonio
    Advances in the Science and Applications of SAR Interferometry
    Presentation's date: 2011-09-20
    Presentation of work at congresses

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  • Analysis of micro-properties for triaxial behaviour on coarse aggregates using DEM

     Tapias Camacho, Mauricio Alberto; Alonso Pérez de Agreda, Eduardo; Gili Ripoll, Jose Antonio
    International Conference on Particle-based Methods
    Presentation's date: 2011
    Presentation of work at congresses

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  • The Doñana National Park (Spain): Geodesy, DTM and water modelling as management tools

     Nuñez Andres, Maria Amparo; Gili Ripoll, Jose Antonio; Blade i Castellet, Ernest; Ibañez Martinez, Enric; Lantada Zarzosa, Nieves; Buill Pozuelo, Felipe; Puig Polo, Carolina
    Date of publication: 2010
    Book chapter

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  • EGEO: Enginyeria Geomàtica

     Gili Ripoll, Jose Antonio; Buill Pozuelo, Felipe; Corral Manuel de Villena, Ignacio; Gonzalez Gonzalez, Juan Carlos; Gonzalez Lopez, Sergio; Lantada Zarzosa, Nieves; Lopez Bravo, Rogelio; Martinez Benjamin, Juan Jose; Nuñez Andres, Maria Amparo; Prades Valls, Albert; Puig Polo, Carolina; Rodriguez Jordana, Juan; Tapia Gomez, Ana Maria
    Jornada R+D+I a l'EPSEB
    Presentation's date: 2010-05-05
    Presentation of work at congresses

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  • Comparing several GPS postprocessing strategies for a potash basin monitoring network in the North-East of Spain: first results

     Gili Ripoll, Jose Antonio; Lantada Zarzosa, Nieves; Concha Dimas, Aline; Soler, Xavier; Puig Polo, Carolina; Marturià, Jordi
    International Symposium on Land Subsidence
    Presentation's date: 2010-10-20
    Presentation of work at congresses

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  • TECNICAS DE TELEDETECCION IN-SITU, ALTIMETRICAS RADAR Y OPTICA EN LAS AREAS DE CALIBRACION LOS PUERTOS DE

     Sanz Conde, M. Mercedes; Tapia Gomez, Ana Maria; Lopez Bravo, Rogelio; Gonzalez Gonzalez, Juan Carlos; Gili Ripoll, Jose Antonio; Martinez De Osés, Francisco Javier; Schutz, Bob; Urban, Timothy; Bosch, Ernest; Martinez Benjamin, Juan Jose
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    Mejoras introducidas en la red local de monitorización de movimientos de Cardona al trabajar con doble constelación GNSS  Open access

     Gili Ripoll, Jose Antonio; Lantada Zarzosa, Nieves; Puig Polo, Carolina; Marturià, Jordi
    Semana Geomática Internacional
    Presentation's date: 2009-03-03
    Presentation of work at congresses

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    Alrededor de la localidad de Cardona (Barcelona, España) la explotación minera ha provocado subsidencias y otros desórdenes en superficie. En 1997 se estableció en la zona una red local de unos 40 puntos, para control de movimientos mediante GPS (método Estático-Rápido), con campañas anuales. En la última campaña de campo (octubre de 2008) se ha tenido ocasión de emplear cuatro receptores de doble frecuencia y de doble constelación, capaces de registrar y procesar las portadoras de los satélites GPS americanos y de los GLONASS rusos. Se han procesado las baselíneas de dos maneras diferentes: con todos los observables o bien sólo con los de GPS. Como era de esperar, el procesado con la doble constelación introduce una muy ligera mejora operativa de precisión al disponer de mayor número de satélites. La desviación típica de una serie de 34 cierres de triángulos observados pasa de 4 mm (GPS) a 3 mm (GPS+GLONASS) en planimetría, y de 6 mm (GPS) a 4 mm (GPS+GLONASS) para la componente altimétrica.

  • LIVING WITH LANDSLIDE RISK IN EUROPE:ASSESSMENT, EFFECTS OF GLOBAL CHANGE AND RISK MANAGEMENT STRATEGIES

     Hürlimann Ziegler, Marcel; Pinyol Puigmarti, Nuria Merce; Baeza Adell, Cristina; Mallorqui Franquet, Jordi Joan; Aguasca Sole, Alberto; Moya Sanchez, Jose; Lantada Zarzosa, Nieves; Lloret Morancho, Antonio; Alonso Pérez de Agreda, Eduardo; Ledesma Villalba, Alberto; Gili Ripoll, Jose Antonio; Fabregas Canovas, Francisco Javier; Olivella Pastalle, Sebastian; Romero Morales, Enrique Edgar; Corominas Dulcet, Jordi
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  • Caracterización geométrica con técnicas ópticas 3D aplicadas al modernismo en Cataluña

     Buill Pozuelo, Felipe
    Defense's date: 2009-10-26
    Department of Architectural Representation and Visual Analysis I, Universitat Politècnica de Catalunya
    Theses

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  • Quadratic surfaces adjusted to Catalan Modernism architecture

     Nuñez Andres, Maria Amparo; Buill Pozuelo, Felipe; Gili Ripoll, Jose Antonio; Regot Marimon, Joaquin Manuel
    Conference Optical 3-D Measurement Techniques
    Presentation of work at congresses

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  • High-precision geoid determination in small areas: A case study in Doñana National Park (Spain)

     Nuñez Andres, Maria Amparo; Martín, A E; Gili Ripoll, Jose Antonio; Anquela, A B
    Studia geophysica et geodaetica
    Date of publication: 2008-07
    Journal article

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  • Validación de Modelos Digitales del Terreno de precisión a partir de datos Láser Escáner Aerotransportado; Aplicación a la Marisma del Parque Nacional de Doñana  Open access

     Ibañez Martinez, Enric
    Defense's date: 2008-06-03
    Department of Geotechnical Engineering and Geo-Sciences, Universitat Politècnica de Catalunya
    Theses

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    En los últimos años ha tomado fuerza el Láser Escáner Aerotransportado (ALS), como una técnica geomática de alta productividad y precisión. Las posibles aplicaciones en las cuales se ha probado, junto con su precisión y resolución, son su punto fuerte ante la competencia con otras técnicas (fotogrametría - teledetección). La línea actual de desarrollo sin embargo apunta hacia la complementariedad de estas tecnologías.En áreas extremadamente llanas, donde los elementos morfológicos que la definen son del orden de algunos decímetros, ésta es la tecnología capaz de llegar a generar Modelos Digitales del Terreno de mayor precisión. Así, dentro de la comisión Doñana 2005, la Confederación Hidrográfica del Guadalquivir aplicó en el año 2002 la tecnología ALS al Parque Nacional de Doñana, que es un área extremadamente llana y extensa. El levantamiento, realizado por una UTE (GEA y FOTONOR), abarca las zonas inundables del Parque Nacional y del Parque Natural, y consta de 55 455 Ha. El área es esencialmente llana (diferencia menor al metro entre la parte más elevada y la más deprimida de la Marisma), con vegetación baja y localmente densa, y sin núcleos de población. Es un área "ideal" para el ALS donde se han detectado problemáticas específicas, que han servido de punto de partida de esta tesis.El objetivo general de esta tesis ha sido mejorar los procesos de obtención de Modelos Digitales del Terreno (MDT) en áreas extensas y llanas como la analizada. Las aportaciones realizadas se centran en su mayoría en verificaciones de MDT (lo más costoso en tiempo) aumentando su grado de automatización. Las otras aportaciones se centran en el filtrado de la nube de puntos ALS en áreas como la Marisma. El primer grupo de aportaciones ha requerido recopilar y establecer estrategias de validación genéricas y específicas y, a continuación, aplicarlas al caso práctico de Doñana. Las comprobaciones realizadas se han dividido en cuantitativas (evalúan numéricamente un área) y cualitativas (la comprueban en términos de correcto e incorrecto). Las cualitativas se han dividido en genéricas y específicas, entendiendo que estas últimas sólo son aplicables en áreas extensas y llanas.Las comprobaciones cuantitativas implementadas se han basado en el marco de referencia geodésico establecido por el Proyecto MADRE (DGICyT), que además ha aportado gran cantidad de información de referencia. Con ella se ha comprobado numéricamente la calidad del modelo. Pero, como se detalla en las conclusiones, dar un único valor como error carece de sentido. En esta tesis se ha desarrollado un modelo de error altimétrico que, usando toda la información cuantitativa, permite caracterizar el error según la extensión de la zona de trabajo. Esencialmente este modelo refleja el hecho ya conocido que el error en un zona pequeña es menor que el valor único obtenido para todo el levantamiento (global). El error en Doñana se encuentra entre los 6.5cm a cortas distancias y los 15.5cm a grandes distancias. Así se explica porqué se refleja en el MDT la red de drenaje de la Marisma (formada por cauces o caños con algún decímetro de diferencia altimétrica entre los bordes y el centro). El modelo de error desarrollado es un modo más completo de caracterizar el error de un MDT en áreas extensas y llanas.Las comprobaciones cualitativas han demostrado su necesidad, ya que sólo con las verificaciones cuantitativas no se asegura la calidad del MDT. En el cuerpo de la tesis se presentan procedimientos aplicables en áreas como la analizada que permiten comprobar un MDT de forma más sistemática, exhaustiva y rápida. La herramienta básica para estas tareas son los ensayos de inundación que han sido formalizados en esta tesis; han demostrado ser potentes y versátiles en la verificación de Modelos Digitales del Terreno. Estos ensayos han permitido: verificar la red de drenaje y el sistema de diques, detectar todo tipo de artefactos (errores de los sistemas GPS/INS) y estimar la ondulación del modelo en áreas extremadamente llanas y sin vegetación.Ambos conjuntos de comprobaciones han posibilitado además, cuestionar los criterios de calidad exigidos para la generación de un MDT; densidad y RMS. Éstos no bastan para asegurar la utilidad del modelo para la aplicación final (la hidráulica superficial en este caso). Un buen medio para asegurar esta calidad total es la implementación de comprobaciones simples de la aplicación del modelo (los ensayos de inundación en este caso) y la interacción con el usuario final (fructífera en este caso, y nada habitual). El MDT de precisión que se ha depurado en esta tesis es una aportación adicional de la misma que ha abierto el paso al Modelado Hidrodinámico de la Marisma del Parque Nacional de Doñana.

  • Monitoring and modeling of slope response to climate changes

     Gili Ripoll, Jose Antonio
    10th Intl. Symp. on Landslides and Engineered Slopes
    Presentation's date: 2008-07-01
    Presentation of work at congresses

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  • M.D.T. de precisión de la marisma del P.N. de Doñana mediante Láser Escáner Aerotransportado (LiDAR)

     Ibañez, E; Gili Ripoll, Jose Antonio; Dolz Ripolles, Jose; Bayán, B
    Revista del Instituto de la Navegación de España
    Date of publication: 2007-05
    Journal article

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  • Lexic panllati de geomatica

     Gili Ripoll, Jose Antonio
    Date of publication: 2007-06
    Book chapter

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  • Aplicación de técnicas GIS a estimación de riesgos naturales: Riesgo Sísmico  Open access

     Lantada Zarzosa, Nieves
    Defense's date: 2007-09-14
    Department of Geotechnical Engineering and Geo-Sciences, Universitat Politècnica de Catalunya
    Theses

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    Este trabajo es una contribución al desarrollo y aplicación de métodos avanzados de análisis de riesgo sísmico en grandes ciudades y se ha estructurado en dos partes: la primera establece el marco teórico de los estudios de riesgo sísmico, detallando los modelos y desarrollos avanzados para la evaluación del daño físico sobre edificios residenciales y de su impacto sobre la población, así como otros aspectos con él relacionados; la segunda describe la aplicación a Barcelona. Se usan dos métodos que se aplican a dos escenarios. El primer método, al que nos referimos como Método del Índice de vulnerabilidad (MIV), considera cinco estados de daño no nulo, define la acción en términos de intensidad macrosísmica y el edificio mediante un índice de vulnerabilidad; el grado de daño esperado se efectúa mediante funciones semiempíricas que dependen de la intensidad y del índice de vulnerabilidad. El segundo método, al que nos referimos como Método del Espectro de Capacidad (MEC) considera cuatro estados de daño no nulo, define la acción sísmica en términos de espectros de respuesta, y el edificio por medio de su espectro de capacidad. El grado de daño esperado se obtiene mediante el desarrollo de curvas de fragilidad y matrices de probabilidad de daño. Para la aplicación de ambos métodos a Barcelona se usa un escenario determinista y uno probabilista. Otra de las aportaciones relevantes de esta investigación es la creación de una herramienta, potente y versátil, diseñada sobre un Sistema de Información Geográfica (SIG) o Geographic Information System (GIS). Esta aplicación permite la integración, explotación y gestión de los datos. Este tipo de programas es imprescindible para cartografiar escenarios georreferenciados y va más allá de la aplicación concreta, pues su actualización es rápida y es de fácil adaptación para estudios de otros riesgos en la misma ciudad o en otras ciudades.Los resultados obtenidos son consistentes con la evolución histórica de la ciudad y con su condición actual, así como con las características de los suelos, poniendo de manifiesto la robustez de los métodos empleados. En general se observa una estructura radial del daño esperado con un mayor daño en Ciutat Vella y menor daño en los distritos periféricos. Destaca también el daño esperado en los pequeños núcleos de los pueblos antiguos de los actuales distritos. El MIV representa mejor las peculiaridades de los edificios individuales. El MEC suaviza estas características clasificando los edificios en 6 clases. El escenario más favorable es el determinista cuando se analiza mediante el MEC con daños esperados entre nulo, leve y moderado; el grado de daño medio de la ciudad es leve. Los más desfavorables son el determinista y probabilista cuando se analizan con el MIV; en ambos casos el estado de daño medio global es moderado. El distrito de l'Eixample destaca por ser el de mayor riesgo debido a la vulnerabilidad de sus edificios, a la alta densidad de edificios y población y al valor expuesto. Se confirma que, en ciudades como Barcelona, situadas en regiones de peligro sísmico entre bajo y moderado, la escasa o nula conciencia del peligro sísmico y la ausencia de precauciones de protección sísmica conduce a una elevada vulnerabilidad de sus edificios y, consecuentemente, a un elevado riesgo. En efecto, para escenarios relativamente moderados, con intensidades entre VI y VII, se esperan daños considerables. Los daños a la población son relevantes y su evaluación es muy sensible a los modelos de víctimas. En este sentido es preciso considerar los valores numéricos concretos como pronósticos del orden de magnitud de las cantidades evaluadas, y, en cualquier caso, se deben interpretar, desde una óptica probabilista, como valores medios para escenarios sísmicos creíbles.Los resultados de este estudio son de una enorme utilidad para la prevención y minoración del riesgo sísmico y para la planificación y gestión de emergencias.

  • Airborne Laser Scanning Survey Over The Doñana National Park (Spain)

     Gili Ripoll, Jose Antonio; Ibáñez, E
    8th Optical 3D measurement techniques Conference
    Presentation of work at congresses

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  • Asar/envisat images for monitoring flood extent evolution

     Marti-Cardona, B; Dolz Ripolles, Jose; Gili Ripoll, Jose Antonio
    7ª Semana Geomática de Barcelona
    Presentation of work at congresses

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  • M.D.T. de precisión de la Marisma del P.N. de Doñana mediante Láser Escáner Aerotransportado (LiDAR)

     Ibáñez, E; Gili Ripoll, Jose Antonio; Dolz Ripolles, Jose; Bayán, B
    7ª Semana Geomática de Barcelona
    Presentation of work at congresses

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  • chairman sala 5, sessió GN1 "Geodesia y Navegación"

     Gili Ripoll, Jose Antonio
    7ª Semana Geomática de Barcelona
    Presentation's date: 2007-02-21
    Presentation of work at congresses

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  • Continuous control of slow movements in landslides

     Gonzalez, D A; Corominas Dulcet, Jordi; Ledesma Villalba, Alberto; Moya Sanchez, Jose; Gili Ripoll, Jose Antonio
    European Geosciences Union General Assembly
    Presentation of work at congresses

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  • Convenio para el establecimiento de una Red de Control Movimientos en la zona de la Cuenca Potásica (Cataluña), Fase-I.

     Lantada Zarzosa, Nieves; Gili Ripoll, Jose Antonio; Puig Polo, Carolina
    Participation in a competitive project

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  • The Mountain Risk research project: challenges in risk management

     Gonzalez, D A; Corominas Dulcet, Jordi; Ledesma Villalba, Alberto; Moya, J; Gili Ripoll, Jose Antonio
    European Geosciences Union General Assembly
    Presentation of work at congresses

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  • Sostenible--No Sostenible

     Gili Ripoll, Jose Antonio; Puig Polo, Carolina; Lantada Zarzosa, Nieves
    Congrés UPC Sostenible 2015
    Presentation of work at congresses

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

     Nuñez Andres, Maria Amparo
    Defense's date: 2006-11-10
    Department of Geotechnical Engineering and Geo-Sciences, Universitat Politècnica de Catalunya
    Theses

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    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 Research) in the National Park of Doñana. The main objectives of those projects were to establish a reference frame for positioning within the Park and to determine an accurate geoid. This would allow obtaining orthometric heights derived from GPS observations, which are very useful in those studies regarding the hydrology and geohydrology of the area. The absence of the geoid model would lead to errors when determining the orthometric heights through ellipsoidal ones, due to the great geoid undulation gradient in this zone.The National Park of Doñana is a protected area due to its great ecological value. It is located in the SW coast of Spain, between Huelva and Sevilla, and it has an extension of 500 km2 approximately. Almost half of its territory is a wetland, covered with water during the humid season. Additionaly, there are several restricted areas. These circumstances difficult the field observations. The first part of the work focuses on the analysis of geodetic and levelling networks already established in the area. It is important to know the conditions and accuracy of these networks, since they will become the base for the network instilled in the inner zone of the Park. The network was used initially when adjusting the different geoid models and later when computing a new model. The local network was linked to the Spanish national network (REGENTE) and to the highly precision levelling network (NAP). The adjustment of the gravimetric geoids IBERGEO95 and EGG97 in the zone was checked.Both were adjusted by means of GPS/levelling/gravimetric observations at some selected points, in two axis showing a N-S and E-W direction approximately, in order to control any directional variation.Checking the adjustment of IBERGEO95 and EGG97 allows to deduce that there is no guarantee of centimetre accuracy within the Park. Thus, a geometric geoid was computed by means of the remove-restore technique, using for that purpose: the global model CG01, obtained from the combined solution of earth data and data coming from space missions CHAMP and GRACE; and the digital terrain model obtained by merging the MDT25 model (from the Instituto Geográfico Nacional, National Geographic Institute of Spain) and the bathymetric data of the zone (from the Instituto Hidrográfico de la Marina, Marine Hydrogeographic Institute of Spain)The field data adquired within this work, as well as the geoid model obtained (namely Doñana 2005) will be of great help for the different studies regarding the superficial hydrology of the marshland and the tectonic and hydrogeological structure of the Park. These studies are currently being carried out and clearly show the inter-relationship among geodetic, geological and hydrogeological disciplines.

  • Analysys tools for differential SAR Interferometric Data

     Gili Ripoll, Jose Antonio
    3rd IAG Symp Geodesy for Geotechnical and Structural Eng & 12th FIG Symp on Deformation Measurement
    Presentation's date: 2006-05-23
    Presentation of work at congresses

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  • Convenio de colaboración entre la Agencia Catalana del Agua (ACA) y la UPC para el Control topográfico de movimientos del terreno con GPS en la zona de Cardona.

     Gili Ripoll, Jose Antonio; Lantada Zarzosa, Nieves; Puig Polo, Carolina
    Participation in a competitive project

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  • Analysis tools for differential sar interferometric data

     Crosetto, M; Gili Ripoll, Jose Antonio; Biescas, E; Agudo, M; Monserrat, O; Crippa, B
    3rd IAG Symp Geodesy for Geotechnical and Structural Eng & 12th FIG Symp on Deformation Measurement
    Presentation of work at congresses

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  • Prediction of ground displacement and velocities from groundwater changes at the Vallcebre landslide (Eastern Pyrenees, Spain)

     Corominas Dulcet, Jordi; Moya Sanchez, Jose; Ledesma Villalba, Alberto; Lloret Morancho, Antonio; Gili Ripoll, Jose Antonio
    Landslides
    Date of publication: 2005-07
    Journal article

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