InSAR monitoring of Coastal Landslides. V. Singhroy, F. Charbonneau, J. Li, G. Pavlic, R. Couture*

Canada Centre for Remote Sensing *Geological Survey of Canada

vern.singhroy@nrcan.gc.ca

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