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Quantitative landslide hazard assessment with remotesensing observations and statistical modelling

Romy Schlögel

To cite this version:Romy Schlögel. Quantitative landslide hazard assessment with remote sensing observations and sta-tistical modelling. Earth Sciences. Université de Strasbourg, 2015. English. �NNT : 2015STRAH009�.�tel-01244590�

UNIVERSITY OF STRASBOURG

ÉCOLE DOCTORALE DES SCIENCES DE LA TERRE, DE L’UNIVERS ET DE L’ENVIRONNEMENT

PhD Thesis presented by

ROMY SCHLÖGEL

For obtaining the degree

Doctor of the University of Strasbourg (PhD)

Quantitative landslide hazard assessment with remote sensing observations

and statistical modelling

Public defence on February 12th, 2015

Examination committee Prof. Pascal Allemand Université Claude-Bernard, Lyon I Reviewer Laboratoire de Géologie de Lyon, Terre, Planètes, Environnement (LGTPE) Prof. Olivier Maquaire Université de Caen Basse-Normandie Reviewer Littoral, Environnement, Télédétection et Géomatique (LETG) Dr. Erwan Pathier Université Joseph Fourier, Grenoble Oral examiner Institut des Sciences de la Terre (ISTerre) Dr. Cécile Doubre Université de Strasbourg Oral examiner

Institut de Physique du Globe de Strasbourg (IPGS) Prof. Frédéric Masson Université de Strasbourg Thesis co-director Institut de Physique du Globe de Strasbourg (IPGS) Dr. Jean-Philippe Malet Université de Strasbourg Thesis co-director Institut de Physique du Globe de Strasbourg (IPGS)

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σ

θ

(1)

(2)

(3)

(4)

(5)

(6)

°

σσ

θθ

π

π π

π π π π π π π π π

Extract AOI on each interferogram1.

Select interferograms- Study phase values2.

Map the sliding compartment(s)4.

Analyse kinematic5.1. Extract profiles and topography5.2. Profiles analysis

Kinematic evolution6.

Recalculate the interferograms- Subtract by median 3.

… …Ex. AOI: La Valette landslide

Ex. interferogram: July-September 2009

Ex. histogram of phase values in ‘stable zone’

med

ian

≈ -

2.0

Evolution of outlines

(5.) Profiles

(4.) Maps of outlines

Evolution of compartments

5.

Ex. longitudinal profile and interpretation

Stable zone

Translation function of mode/median value

Ex. new ‘interferogram’: July-September 2009 - mode

(2.) Selected interferograms

Ex. outline of the sliding zone for July-September 2009New ‘interferogram’ (3.)

New ‘interferogram’ (3.)

Profiles

Ex. AOI: La Valette landslide

Barcelonnette area

DTM(s)Accumulation Ablation

7. Create velocity maps

(4.) Maps of outlines

Coherence maps (0-1)

Velocity mapsVelocity mapsVelocity maps(cm/day)

Map of sliding area realized at 1:3 000

Extract outlines

Define coherence thresholds

Remove highly decorrelated areas