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GTM-01 General contributions to geomechanics
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Improving landslide forecasting models using ground based SAR data: the Portalet case study
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Gerardo Herrera, Instituto Geológico y Minero de España (Spain)
Jose Antonio Fernandez, Universidad Rey Juan Carlos (Spain)
Diana Ponce de Leon, Instituto Geológico y Minero de España (Spain)
Pablo Mira, CEDEX (Spain)
Joaquin Mulas, Instituto Geológico y Minero de España (Spain)
Manuel Pastor, CEDEX (Spain)
Linhsia Noferini, University of Florence (Italy)
Luzi Guido, University of Florence (Italy)
Daniele Mecatti, University of Florence (Italy)
Giovanni Macaluso, University of Florence (Italy)
Massimiliano Pieraccini, University of Florence (Italy)
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Galahad is an ongoing Specific Targeted Research Project developed within the frame of the 6th Framework Programme - Priority 1.1.6.3. The objective is to retrieve, through the use of improved GB-SAR and TLS technologies, field parameters that can be used in prediction algorithms of landslides, avalanches and glaciers related hazards. The Portalet landslide is a large, active slope failure located on the upper part of the Gallego River valley, in the Central Spanish Pyrenees (Sallent de Gallego, Huesca). The landslide is located on a southwest-facing hillside of Petrasos Peak, close to the ski resort of Formigal. The dimensions of the landslide are 500 m long and up to 700 m wide at the toe extended over an area of 0.35 km2 that shows superficial cracking and distinct ground displacements. Deformations are quite important (several cm in a month) from summer 2004 when the construction of a parking area was carried out by digging the foot of the landslide. Field observations show a close relation between ground movement and rainfall intensity. Monitoring and predicting the landslide behaviour is necessary to guarantee the safety of this ski resort area. Monitoring was performed with four differential GPS (DGPS) campaigns between May and November 2006 and installing a novel ground based SAR (GBSAR) monitoring system. GBSAR measurements were recorded continuously for 47 days, from the 5th of October 2006 to the 21st of November 2006, providing up-to-date displacement maps of the landslide area at a rate of 1 per hour. A one dimension (1D) infinite slope model solving the momentum equation including a viscous term of Bingham type gives a first approach directly from groundwater level changes. This model has been used to reproduce the ground displacements and velocities measured with the GBSAR and DGPS techniques, showing that prediction of slope behaviour is feasible if data parameters are well documented.
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