11 results on '"Bally, Philippe"'
Search Results
2. Possible role of anthropogenic climate change in the record-breaking 2020 Lake Victoria levels and floods.
- Author
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Pietroiusti, Rosa, Vanderkelen, Inne, Otto, Friederike E. L., Barnes, Clair, Temple, Lucy, Akurut, Mary, Bally, Philippe, van Lipzig, Nicole P. M., and Thiery, Wim
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EFFECT of human beings on climate change ,FLOODS ,FLOOD risk ,SHORELINES ,MODES of variability (Climatology) ,RAINFALL ,WATERSHEDS - Abstract
Heavy rainfall in East Africa between late 2019 and mid 2020 caused devastating floods and landslides throughout the region. These rains drove the levels of Lake Victoria to a record-breaking maximum in the second half of May 2020. The combination of high lake levels, consequent shoreline flooding, and flooding of tributary rivers caused hundreds of casualties and damage to housing, agriculture and infrastructure in the riparian countries of Uganda, Kenya and Tanzania. Media and government reports linked the heavy precipitation and floods to anthropogenic climate change, but a formal scientific attribution study has not been carried out so far. In this study, we characterise the spatial extent and impacts of the floods in the Lake Victoria basin, and then investigate to what extent human-induced climate change influenced the probability and magnitude of the record-breaking lake levels and associated flooding, by applying a multi-model extreme event attribution methodology. Using remote sensing-based flood mapping tools, we find that more than 29 thousand people living within a 50 km radius of the lake shorelines were affected by floods between April and July 2020. Precipitation in the basin was the highest recorded in at least three decades, causing lake levels to rise by 1.21 m between late 2019 and mid 2020. The flood, defined as a 6-month rise in lake levels as extreme as that observed in the lead-up to May 2020, is estimated to be a 63-year event in the current climate. Based on observations and climate model simulations, the best estimate is that the event has become more likely by a factor of 1.8 in the current climate compared to a pre-industrial climate, and that in the absence of anthropogenic climate change an event with the same return period would have led lake levels to rise by 7 cm less than observed. Nonetheless, uncertainties in the attribution statement are relatively large due to large natural variability, and include the possibility of no observed attributable change in the probability of the event (probability ratio, 95% confidence interval 0.8 - 15.8) or in the magnitude of lake level rise during an event with the same return period (magnitude change, 95% confidence interval 0 - 14 cm). In addition to anthropogenic climate change, other possible drivers of the floods and their impacts include human land and water management, the exposure and vulnerability of settlements and economic activities located in flood-prone areas, and modes of climate variability that modulate seasonal precipitation. The attribution statement could be strengthened by using a larger number of climate model simulations, as well as by quantitatively accounting for non-meteorological drivers of the flood and potential unforced modes of climate variability. By disentangling the role of anthropogenic climate change and natural variability in the high-impact 2020 floods in the Lake Victoria basin, this paper contributes to a better understanding of changing hydrometeorological extremes in East Africa and the African Great Lakes region. [ABSTRACT FROM AUTHOR]
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- 2023
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3. SNAPPING Services on the Geohazards Exploitation Platform for Copernicus Sentinel-1 Surface Motion Mapping
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Foumelis, Michael, primary, Delgado Blasco, Jose Manuel, additional, Brito, Fabrice, additional, Pacini, Fabrizio, additional, Papageorgiou, Elena, additional, Pishehvar, Panteha, additional, and Bally, Philippe, additional
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- 2022
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4. Near real-time SAR-based processing to support flood monitoring
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Cossu, Roberto, Schoepfer, Elisabeth, Bally, Philippe, and Fusco, Luigi
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- 2009
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5. The Satellite Data Thematic Core Service within the EPOS Research Infrastructure
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Manunta, Michele M., Casu, F., Zinno, Ivana, De Luca, Claudio, Buonanno, Sabatino, Zeni, G., Wright, Tim, Hooper, Andy, Diament, Michel, Ostanciaux, Emilie, Mandea, M., Walter, Thomas, Maccaferri, Francesco, Fernández Torres, José, Stramondo, Salvatore, Bignami, Christian, Bally, Philippe, Pinto, Salvatore, Marin, Alessandro, and Cuomo, Antonio
- Abstract
Trabajo presentado en la European Geosciences Union General Assembly, celebrada en Viena (Austria), del 23 al 28 de abril de 2017, EPOS, the European Plate Observing System, is a long-term plan to facilitate the integrated use of data, data products, software and services, available from distributed Research Infrastructures (RI), for solid Earth science in Europe. Indeed, EPOS integrates a large number of existing European RIs belonging to several fields of the Earth science, from seismology to geodesy, near fault and volcanic observatories as well as anthropogenic hazards. The EPOS vision is that the integration of the existing national and trans-national research infrastructures will increase access and use of the multidisciplinary data recorded by the solid Earth monitoring networks, acquired in laboratory experiments and/or produced by computational simulations. The establishment of EPOS will foster the interoperability of products and services in the Earth science field to a worldwide community of users. Accordingly, the EPOS aim is to integrate the diverse and advanced European Research Infrastructures for solid Earth science, and build on new e-science opportunities to monitor and understand the dynamic and complex solid-Earth System. One of the EPOS Thematic Core Services (TCS), referred to as Satellite Data, aims at developing, implementing and deploying advanced satellite data products and services, mainly based on Copernicus data (namely Sentinel acquisitions), for the Earth science community. This work intends to present the technological enhancements, fostered by EPOS, to deploy effective satellite services in a harmonized and integrated way. In particular, the Satellite Data TCS will deploy five services, EPOSAR, GDM, COMET, 3D-Def and MOD, which are mainly based on the exploitation of SAR data acquired by the Sentinel-1 constellation and designed to provide information on Earth surface displacements. In particular, the planned services will provide both advanced DInSAR products (deformation maps, velocity maps, deformation time series) and value-added measurements (source model, 3D displacement maps, seismic hazard maps). Moreover, the services will release both on-demand and systematic products. The latter will be generated and made available to the users on a continuous basis, by processing each Sentinel-1 data once acquired, over a defined number of areas of interest; while the former will allow users to select data, areas, and time period to carry out their own analyses via an on-line platform. The satellite components will be integrated within the EPOS infrastructure through a common and harmonized interface that will allow users to search, process and share remote sensing images and results. This gateway to the satellite services will be represented by the ESA- Geohazards Exploitation Platform (GEP), a new cloud-based platform for the satellite Earth Observations designed to support the scientific community in the understanding of high impact natural disasters. Satellite Data TCS will use GEP as the common interface toward the main EPOS portal to provide EPOS users not only with data products but also with relevant processing and visualisation software, thus allowing users to gather and process on a cloud-computing infrastructure large datasets without any need to download them locally
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- 2017
6. Evaluation of the SBAS InSAR Service of the European Space Agency’s Geohazard Exploitation Platform (GEP)
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Galve, Jorge, primary, Pérez-Peña, José, additional, Azañón, José, additional, Closson, Damien, additional, Caló, Fabiana, additional, Reyes-Carmona, Cristina, additional, Jabaloy, Antonio, additional, Ruano, Patricia, additional, Mateos, Rosa, additional, Notti, Davide, additional, Herrera, Gerardo, additional, Béjar-Pizarro, Marta, additional, Monserrat, Oriol, additional, and Bally, Philippe, additional
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- 2017
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7. Evaluation of the SBAS InSAR Service of the European Space Agency’s Geohazard Exploitation Platform (GEP)
- Author
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Galve, Jorge Pedro, Pérez-Peña, José Vicente, Azañón, José Miguel, Closson, Damien, Caló, Fabiana, Reyes-Carmona, Cristina, Jabaloy, Antonio, Ruano, Patricia, Mateos Ruiz, Rosa María, Notti, Davide, Herrera García, Gerardo, Béjar Pizarro, Marta, Monserrat, Oriol, Bally, Philippe, Galve, Jorge Pedro, Pérez-Peña, José Vicente, Azañón, José Miguel, Closson, Damien, Caló, Fabiana, Reyes-Carmona, Cristina, Jabaloy, Antonio, Ruano, Patricia, Mateos Ruiz, Rosa María, Notti, Davide, Herrera García, Gerardo, Béjar Pizarro, Marta, Monserrat, Oriol, and Bally, Philippe
- Abstract
The analysis of remote sensing data to assess geohazards is being improved by web-based platforms and collaborative projects, such as the Geohazard Exploitation Platform (GEP) of the European Space Agency (ESA). This paper presents the evaluation of a surface velocity map that is generated by this platform. The map was produced through an unsupervised Multi-temporal InSAR (MTI) analysis applying the Parallel-SBAS (P-SBAS) algorithm to 25 ENVISAT satellite images from the South of Spain that were acquired between 2003 and 2008. This analysis was carried out using a service implemented in the GEP called “SBAS InSAR”. Thanks to the map that was generated by the SBAS InSAR service, we identified processes not documented so far; provided new monitoring data in places affected by known ground instabilities; defined the area affected by these instabilities; and, studied a case where GEP could have been able to help in the forecast of a slope movement reactivation. This amply demonstrates the reliability and usefulness of the GEP, and shows how web-based platforms may enhance the capacity to identify, monitor, and assess hazards that are associated to geological processes.
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- 2017
8. Evaluation of the SBAS InSAR Service of the European Space Agency’s Geohazard Exploitation Platform (GEP)
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Ministerio de Economía y Competitividad (España), Galve, Jorge Pedro, Pérez-Peña, José Vicente, Azañón, José Miguel, Closson, Damien, Caló, Fabiana, Reyes-Carmona, Cristina, Jabaloy, Antonio, Ruano, Patricia, Mateos Ruiz, Rosa María, Notti, Davide, Herrera García, Gerardo, Béjar Pizarro, Marta, Monserrat, Oriol, Bally, Philippe, Ministerio de Economía y Competitividad (España), Galve, Jorge Pedro, Pérez-Peña, José Vicente, Azañón, José Miguel, Closson, Damien, Caló, Fabiana, Reyes-Carmona, Cristina, Jabaloy, Antonio, Ruano, Patricia, Mateos Ruiz, Rosa María, Notti, Davide, Herrera García, Gerardo, Béjar Pizarro, Marta, Monserrat, Oriol, and Bally, Philippe
- Abstract
The analysis of remote sensing data to assess geohazards is being improved by web-based platforms and collaborative projects, such as the Geohazard Exploitation Platform (GEP) of the European Space Agency (ESA). This paper presents the evaluation of a surface velocity map that is generated by this platform. The map was produced through an unsupervised Multi-temporal InSAR (MTI) analysis applying the Parallel-SBAS (P-SBAS) algorithm to 25 ENVISAT satellite images from the South of Spain that were acquired between 2003 and 2008. This analysis was carried out using a service implemented in the GEP called “SBAS InSAR”. Thanks to the map that was generated by the SBAS InSAR service, we identified processes not documented so far; provided new monitoring data in places affected by known ground instabilities; defined the area affected by these instabilities; and, studied a case where GEP could have been able to help in the forecast of a slope movement reactivation. This amply demonstrates the reliability and usefulness of the GEP, and shows how web-based platforms may enhance the capacity to identify, monitor, and assess hazards that are associated to geological processes.
- Published
- 2017
9. Disaster risk reduction and reconstruction in Indonesia with Earth Observation.
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Massimi, Vincenzo, Amodio, Angelo, Utanda, Angel, Alonso, Alberto, Bally, Philippe, Manunta, Paolo, Nitti, Davide, and Nutricato, Raffaele
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EARTHQUAKE magnitude ,HIGH resolution imaging ,SOIL liquefaction ,TERRAIN mapping ,DISASTERS ,WENCHUAN Earthquake, China, 2008 - Abstract
On September 28,2018, a 7.5 magnitude earthquake struck the island of Sulawesi, Indonesia. The epicentre was the provincial capital of Palu, located on a bay on the island’s northwest coast. The quake triggered a tsunami that swept 10-meter tall waves of seawater and swamped the city. The combination of the earthquake, tsunami, soil liquefaction and landslides claimed well over 2000 lives, destroyed homes, buildings, infrastructures and farmland in several districts. Recognizing the need to relocate settlements from the liquefaction-prone areas, the Indonesian government developed the Master Plan for Recovery and Reconstruction for Central Sulawesi through the EARR and SWIP projects. Indra and Planetek Italia contributed to the implementation of this plan with a batch of EO-based services. The main information provided was related to terrain deformation mapping (before the earthquake)followed by the update of terrain information mapping (in the months immediately after the earthquake)and reconstruction monitoring with Very High Resolution images. The collaboration went on with a capacity-building workshop and aknowledge transfer activity held in Jakarta in June 2019 regarding the technical aspects of the delivered products and training sessions for local users to teach them to use the Geohazards Exploitation Platform (GEP) of ESA. [ABSTRACT FROM AUTHOR]
- Published
- 2020
10. Evaluation of the SBAS InSAR Service of the European Space Agency's Geohazard Exploitation Platform (GEP).
- Author
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Pedro Galve, Jorge, Pérez-Peña, José Vicente, Azañón, José Miguel, Closson, Damien, Caló, Fabiana, Reyes-Carmona, Cristina, Jabaloy, Antonio, Ruano, Patricia, María Mateos, Rosa, Notti, Davide, Herrera, Gerardo, Béjar-Pizarro, Marta, Monserrat, Oriol, and Bally, Philippe
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HAZARDS ,MAPS ,SYNTHETIC aperture radar ,REMOTE-sensing images - Abstract
The analysis of remote sensing data to assess geohazards is being improved by web-based platforms and collaborative projects, such as the Geohazard Exploitation Platform (GEP) of the European Space Agency (ESA). This paper presents the evaluation of a surface velocity map that is generated by this platform. The map was produced through an unsupervised Multi-temporal InSAR (MTI) analysis applying the Parallel-SBAS (P-SBAS) algorithm to 25 ENVISAT satellite images from the South of Spain that were acquired between 2003 and 2008. This analysis was carried out using a service implemented in the GEP called "SBAS InSAR". Thanks to the map that was generated by the SBAS InSAR service, we identified processes not documented so far; provided new monitoring data in places affected by known ground instabilities; defined the area affected by these instabilities; and, studied a case where GEP could have been able to help in the forecast of a slope movement reactivation. This amply demonstrates the reliability and usefulness of the GEP, and shows how web-based platforms may enhance the capacity to identify, monitor, and assess hazards that are associated to geological processes. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
11. Thematic Core Service on Satellite Data of the EPOS Research Infrastructure.
- Author
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Manunta, Michele, Casu, Francesco, Zinno, Ivana, Tizzani, Pietro, Castaldo, Raffaele, Wright, Tim, Diament, Michel, Ostanciaux, Emilie, Mandea, Mioara, Fernandez, Jose, Stramondo, Salvatore, Bignami, Christian, Bally, Philippe, Pinto, Salvatore, Maccaferri, Francesco, and Walter, Thomas
- Published
- 2018
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