Combination of multi-sensor PSI monitoring data with a landslide damage inventory: the Tena Valley case study (Central Spanish Pyrenees) (Invited)
Abstract
This work illustrates the usefulness of integrating multi-sensor DInSAR monitoring data and landslide damage inventories for risk analysis. The approach has been applied in the Tena Valley (Central Spanish Pyrenees), where active landslides have caused significant damage on human structures over the last decade. Slope instability in this glacial trough is mainly related to very slow deep-seated slide-flows developed in Paleozoic slates. The PSI processing of ascending orbit ALOS PALSAR images (2006-2010), and descending orbit ERS & Envisat (2001-2007) and TerraSAR-X (2008) datasets, has provided heterogeneous displacement velocity measurements. The geometrical differences introduced by each satellite have been homogenized through the projection of the LOS displacements along the steepest slope gradient. Additionally, conventional DInSAR analysis of ALOS PALSAR images has permitted the detection of faster movements (up to 145cm yr-1) from 46 day interferograms (, increasing the number of detected landslides. Overall, the number of monitored landslides increased from 4% and 19%, using C- and X- band data, to 38% of the total (294) using L-band. In a subsequent phase, the multi-sensor velocities measured for the landslides are classified with respect to the magnitude of the road damage occurred in the 2008-2010 period. According to available measurements, minor or no damages are produced for landslide velocities smaller than 21 mm yr-1, moderate damages occurred between 21 and 160 mm yr-1, and major damages between 160 and 1450 mm yr-1.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2013
- Bibcode:
- 2013AGUFMNH32A..07H
- Keywords:
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- 4303 NATURAL HAZARDS Hydrological;
- 4328 NATURAL HAZARDS Risk;
- 4315 NATURAL HAZARDS Monitoring;
- forecasting;
- prediction;
- 4337 NATURAL HAZARDS Remote sensing and disasters