InSAR monitoring of Coastal Landslides. V. Singhroy, F. Charbonneau, J. Li, G. Pavlic, R. Couture*
Canada Centre for Remote Sensing *Geological Survey of Canada
Debris flows
Landslides in Cretaceous
Shale
Retrogressive earthflows
Rockfalls
Rotational slumps
Landslides in Canada
Coastal Landslides
ObjectivesCCRS & GSC
– Provide examples of InSAR monitoring of coastal landslides along transportation corridors, focusing on different triggering mechanisms and rates of movement.
U. Laval, Geol Survey of N, Geol Survey of NF F– Integrate InSAR measurements with in existing seismic tools.– Understand the geo-mechanical processes. – Develop a remote monitoring warning system
Transport Canada & Transport Qc, Geol Survey of NF– Insure safety of the railway and highways– Develop a strategic mitigation plan based on the risk
InSAR Monitoring Sites in Canada
Earthquake sites
Landslide sites
Gaspé Study area – slope failure in 1998
Active zone
Landslide: Field InstrumentsLandslide: Field Instruments
Crackmeters
Bi-axial tiltmeter
Piezometers
Shape Accel Array
Extensometer rods
Data logger
Remote data access
InSAR ContributionInSAR Contribution
Passive In Situ
No In Situ
Deployment of corner reflectorsDescending & Ascending
PTA-InSAR AquisitionRADARSAT-2 InSAR Data
• Three Spotlight Beam Modes– SLA 76: inc ≈ 27o
– SLA 19: inc ≈ 44o
– SLA 3 : inc ≈ 32o Ascending
• 24 days orbit cycle (same acquisition
geometry)
• Different inc for validation and 2-D modeling
• Spatial resolution 1.6 m x 0.74 m (range x
azimuth)10/4
/200
9
1/12
/201
0
4/22
/201
0
7/31
/201
0
11/8
/201
0
2/16
/201
1
5/27
/201
1
9/4/
2011
Acquisition Dates
SLA19 D
SLA76 D
SLA3 A
Gascons, QcGascons, QcPéninsule gaspésiennePéninsule gaspésienne
-2
0
2
4
6
8
10
12
14
10/1
4/20
09
12/3
/200
9
1/22
/201
0
3/13
/201
0
5/2/
2010
6/21
/201
0
8/10
/201
0
9/29
/201
0
11/1
8/20
10
1/7/
2011
Acquisition Dates
LO
S D
isp
lac
em
en
t [m
m]
CR3
CR4
CR5
CR6
CR7
CR8
4mm/y
12mm/y
PTA-InSAR: Results 2D• LOS Displacement Rate (mm/year)
– April-November 2010 Decomposition: 2D
Look
Azimuth
Azimuth-Horizontal Vertical
CR1 (ref) 0 0
CR2 (ref) 0 0
CR3 36* -14
CR4 15 4
CR5 14 9
CR6 14 3
CR7 2 2
CR8 -2 -9
-40
-30
-20
-10
0
10
May-09 Jul-09 Sep-09 Nov-09 Jan-10 Mar-10 May-10 Jul-10 Sep-10 Nov-10 Jan-11 Mar-11 May-11
Time
Ver
tical
Dis
plac
emen
t (m
m)
-40
-30
-20
-10
0
10
Radarsat-2 TerraSAR-X
Daniels Harbour, NF- InSAR monitoring of Coastal Landslides
15mm/year
Daniels Harbour, NF: Monitoring Landslide from Radarsat-2 InSAR
-50 0 50
Vertical displacement [mm]
April 2007
RADARSAT-2 Ultra Fine : Master: 20090610Slave: 20090914Baseline: 67 m
x
Site A
Site B
-100
-80
-60
-40
-20
0
20
Jun-09 Sep-09 Dec-09 Mar-10 Jun-10 Sep-10 Dec-10 Mar-11 Jun-11
Time
Ver
tica
l d
isp
lace
men
t (m
m)
Site A Site B
June 2010
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
Site A
Site B Site C
-200
-180
-160
-140
-120
-100
-80
-60
-40
-20
0
May-09 Aug-09 Nov-09 Feb-10 May-10 Aug-10 Nov-10 Feb-11 May-11 Aug-11
Dates
Ve
rtic
al d
isp
lac
em
en
t (m
m)
Site A Site B Site C
80mm/y
RADARSAT 2 INSAR monitoring of Corner Brook Landslides
-60 0 60
Vertical displacement [mm]
1) RADARSAT 2 – Ultra Fine Inc. Angle = 36.81° Ascending Orbit2) Lidar DEM 1 m
Deformations are only shown where scene coherence exceeds 0.5
x
Corner Brook, NF: Monitoring Landslide from Radarsat-2 InSAR
-140
-120
-100
-80
-60
-40
-20
0
May-09 Aug-09 Nov-09 Feb-10 May-10 Aug-10 Nov-10 Feb-11 May-11 Aug-11
Dates
Ve
rtic
al d
isp
lac
em
en
t (m
m)
RADARSAT MissionsRADARSAT Missions Committed to provide RADARSAT Data Continuity
1995: RADARSAT-1
2007: RADARSAT-2
2016:2017: 2017:
RCM
Repeat Cycle: 24 days
24 days 4
daysSpatial Resolution
10 to 100 metres 0.7 to 100 metres 3 to 100 metres
Conclusions• 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.
• 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.
• RADARSAT constellation (2016), will be used to
monitor these landslides areas on a weekly basis for improved mitigation measures.
.
Thanks
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