igarss11-singhroy.ppt

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igarss11-singhroy.ppt

  1. 1. InSAR monitoring of Coastal Landslides. V. Singhroy, F. Charbonneau, J. Li, G. Pavlic, R. Couture* Canada Centre for Remote Sensing * Geological Survey of Canada [email_address]
  2. 2. Debris flows Landslides in Cretaceous Shale Retrogressive earthflows Rockfalls Rotational slumps Landslides in Canada Coastal Landslides
  3. 3. Objectives <ul><li>CCRS & GSC </li></ul><ul><ul><li>Provide examples of InSAR monitoring of coastal landslides along transportation corridors, focusing on different triggering mechanisms and rates of movement. </li></ul></ul><ul><li>U. Laval, Geol Survey of N, Geol Survey of NF F </li></ul><ul><ul><li>Integrate InSAR measurements with in existing seismic tools . </li></ul></ul><ul><ul><li>Understand the geo-mechanical processes. </li></ul></ul><ul><ul><li>Develop a remote monitoring warning system </li></ul></ul><ul><li>Transport Canada & Transport Qc, Geol Survey of NF </li></ul><ul><ul><li>Insure safety of the railway and highways </li></ul></ul><ul><ul><li>Develop a strategic mitigation plan based on the risk </li></ul></ul>
  4. 4. InSAR Monitoring Sites in Canada Earthquake sites Landslide sites
  5. 5. Gaspé Study area – slope failure in 1998 Active zone
  6. 6. Landslide: Field Instruments <ul><li>Crackmeters </li></ul><ul><li>Bi-axial tiltmeter </li></ul><ul><li>Piezometers </li></ul><ul><li>Shape Accel Array </li></ul><ul><li>Extensometer rods </li></ul><ul><li>Data logger </li></ul><ul><li>Remote data access </li></ul>InSAR Contribution Passive In Situ No In Situ
  7. 7. Deployment of corner reflectors Descending & Ascending
  8. 8. PTA-InSAR Aquisition <ul><li>RADARSAT-2 InSAR Data </li></ul><ul><li>Three Spotlight Beam Modes </li></ul><ul><ul><li>SLA 76:  inc ≈ 27 o </li></ul></ul><ul><ul><li>SLA 19:  inc ≈ 44 o </li></ul></ul><ul><ul><li>SLA 3 :  inc ≈ 32 o Ascending </li></ul></ul><ul><li>24 days orbit cycle (same acquisition geometry) </li></ul><ul><li>Different  inc for validation and 2-D modeling </li></ul><ul><li>Spatial resolution 1.6 m x 0.74 m (range x azimuth) </li></ul>
  9. 9. Gascons, Qc Péninsule gaspésienne 4mm/y 12mm/y
  10. 10. PTA-InSAR: Results 2D <ul><li>LOS Displacement Rate (mm/year) </li></ul><ul><ul><li>April-November 2010 Decomposition: 2D </li></ul></ul>Look Azimuth 0 0 -9 -2 CR8 2 2 CR7 3 14 CR6 9 14 CR5 4 15 CR4 -14 36 * CR3 0 0 CR2 (ref) CR1 (ref) Vertical Azimuth-Horizontal
  11. 12. Daniels Harbour, NF- InSAR monitoring of Coastal Landslides 15mm/year
  12. 13. Daniels Harbour, NF: Monitoring Landslide from Radarsat-2 InSAR April 2007 RADARSAT-2 Ultra Fine : Master: 20090610 Slave: 20090914 Baseline: 67 m x Site A Site B June 2010 -50 0 50 Vertical displacement [mm]
  13. 14. Landslides in Newfoundland- Corner Brook and Daniels Harbour Triggers: Coastal erosion from high frequency and intensity of storms combined with favourable geological conditions Corner Brook
  14. 15. Site A Site B Site C 80mm/y RADARSAT 2 INSAR monitoring of Corner Brook Landslides
  15. 16. 1) RADARSAT 2 – Ultra Fine Inc. Angle = 36.81° Ascending Orbit 2) Lidar DEM 1 m Deformations are only shown where scene coherence exceeds 0.5 x Corner Brook, NF: Monitoring Landslide from Radarsat-2 InSAR -60 0 60 Vertical displacement [mm]
  16. 17. RADARSAT Missions Committed to provide RADARSAT Data Continuity 1995: RADARSAT-1 2007: RADARSAT-2 2016: 2017: 2017: RCM Repeat Cycle: 24 days 24 days 4 days 3 to 100 metres 0.7 to 100 metres 10 to 100 metres Spatial Resolution
  17. 18. Conclusions <ul><li>RADARSAT 2 InSAR techniques are being used to monitor the spatial and temporal heterogeneities of the terrain movements in order to understand the dynamics of low velocity coastal landslides affecting transportation corridors. </li></ul><ul><li>All our measurements show different rates of motion based on favourable geological and seasonal conditions and proximity to the coastline. These factors have implications on our understanding of their triggering mechanisms and behaviour. </li></ul><ul><li>RADARSAT constellation (2016), will be used to monitor these landslides areas on a weekly basis for improved mitigation measures . </li></ul><ul><li>. </li></ul>
  18. 19. Thanks

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