Science Service System

Summary of Proposal GEO2468

TitleEvaluation of landslides monitoring with DInSAR using the 6Beam Wide-Scansar and the Staring Spotlight TSX experimental modes
Investigator Mallorqui, Jordi J. - Universitat Politecnica de Catalunya (UPC), Signal Theory and Communications
Team Members
Associate Professor Fabregas, Xavier - Universitat Politecnica de Catalunya (UPC), Signal Theory and Communications
Associate Professor Aguasca, Albert - Universitat Politecnica de Catalunya (UPC), Signal Theory and Communications
Engineer Monells, Daniel - Universitat Politecnica de Catalunya (UPC), Signal Theory and Communications
Full Professor Corominas, Jordi - Universitat Politecnica de Catalunya (UPC), Geotechnical Engineering and Geosciences
Full Professor Gili, Josep A. - Universitat Politecnica de Catalunya (UPC), Geotechnical Engineering and Geosciences
Associate Professor Moya, Jose - Universitat Politecnica de Catalunya (UPC), Geotechnical Engineering and Geosciences
Associate Professor Mavrouli, Olga-Christina - Universitat Politecnica de Catalunya (UPC), Geotechnical Engineering and Geosciences
Associate Professor Ruiz, Roger - Universitat Politecnica de Catalunya (UPC), Geotechnical Engineering and Geosciences
Summary

The project is divided in two scales of analysis:

  1. Regional analysis performed with 6Beam Wide-Scansar data. The goal is to identify those large slope failures (LRS and DSGD) that are currently active. The analysis of the deformations will provide clues for the understanding the failure mechanisms, the extent and their potential threat. The fact of most of the study area is located above the tree-line where the rocky outcrops are predominant should favor the applicability if the DInSAR techniques and obtaining consistent results.
  2. Local analysis performed with the Staring-Spotlight data. The study of a landslide in Canillo (Andorra), with known recent activity and available groumd-truth, as an example of unstable slope to monitor. The landslide was triggered during post-glacial (Holocene) times and has been episodically reactivated by long-lasting rainy periods and foot erosion by the Valira river. This landslide has been instrumented with the support of the Andorran administration and it is currently being studied from a geomechanical point-of-view in order to assess the feasibility for implementing an early warning system.

The research is designed with the following OBJECTIVES:

  • Scientific evaluation of the evolution of the landslides with advanced DInSAR techniques employing both wide-swath and high-resolution data. In particular to study the benefits of high resolution images for persistent scatters detection. The benefits of the higher deformation sensitivity and the short revisiting time for landslide monitoring will be also evaluated.
  • Comparison and synergy between TerraSAR-X results and those derived from in-situ measurements (inclinometers and extensometers), GPS networks and any acillary information available.
  • Improvement in the validation of differential interferometric products in landslide scenarios due to the higher resolution and better geocoding of the results with ground-truth measurements.

The following actions constitute the METHODOLOGY proposed for this project:

  • Modification of the data formats and algorithms of the interferometric chain and the coherent pixels technique (CPT) to be adapted to Wide-Scansar and Staring Spotlight data.
  • Inclusion of external data on the TerraSAR data processing. The a-priori information of the landslide dynamics obtained with in-situ instrumentation will help to refine the motions obtained from TerraSAR data.

The following DATA are required for the fulfillment of the project:

  • TerraSAR-X images acquired in Wide-Scansar and Staring Spotlight modes over the areas of interest in a repetitive basis: 11 days cycle and the same configuration with descending orbits. The orientation of the landslide makes that the descending orbit perfectly suited to our objectives. 30 images for each mode are necessary.
  • Precise Orbital data of the acquisitions.
  • In situ measurements: topographical control data, ground deformation data (from extensometers devices, topographical surveying, continuous line ground displacement measurement devices, etc), geomechanical properties of landslide material, geological data.
  • DEM of the study area.

The main DELIVERABLES of the project are:

  • Ground displacement field maps with the finest resolution possible to establish the landslide pattern.
  • Accuracy of the ground displacement results provided by this technique and cross-validation with GB-SAR data.
  • Identification of landslide movement patterns. Kinematical interpretation of the landslide phenomena.
  • Analysis of the potential of TerraSAR-X images for Early Warning Systems.

The project will be funded with the project TEC2011-28201-C02-01 of the Spanish Ministry of Science and Technology.

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