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3D geological and structural characterization of rockwalls and rockfall erosion assessment

English title 3D geological and structural characterization of rockwalls and rockfall erosion assessment
Applicant Jaboyedoff Michel
Number 159221
Funding scheme Project funding (Div. I-III)
Research institution Institut de géographie et de durabilité Faculté des géosciences et environnement Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geology
Start/End 01.09.2015 - 31.08.2017
Approved amount 151'092.00
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All Disciplines (2)

Discipline
Geology
Geomorphology

Keywords (9)

LiDAR ; Erosion; Structural geology; Photogrammetry; Reservoir; Remote Sensing; 3D geology; Rockfall; Thermal imaging

Lay Summary (French)

Lead
LeadLe recul des parois rocheuses se produit essentiellement par des éboulements de volumes et de formes très variables. La morphologie des compartiments qui tombent est déterminée par la structure du massif rocheux et est liée à son pré-découpage par des familles de discontinuités. La fréquence temporelle des chutes de blocs (= aléa) est également influencée par cette structure et par l’histoire géologique des contraintes qui ont lentement plissé et façonné le relief. Une analyse structurale détaillée est donc nécessaire pour améliorer l’estimation de la probabilité / fréquence d’éboulement, qualifié d’aléa dans le domaine des risques naturels, du fait de l’impossibilité de la prévoir de manière déterministe aux échelles de temps concernées par l’aménagement du territoire.
Lay summary

Contenu et objectifs du travail de recherche

Notre objectif principal est d’améliorer la compréhension des processus qui déstabilisent les parois verticales afin de mieux évaluer la localisation des masses rocheuses potentiellement instables. Pour ce faire, nous envisageons premièrement de cartographier les structures géologiques sur des modèles 3D « photoréalistes » en couplant les nuages de points LiDAR avec différents types d’imagerie haute-résolution: photogrammétrie, panorama gigapixel et thermographie infrarouge. Sur cette base, nous analyserons ensuite en détail les caractéristiques géométriques des discontinuités (orientation, pendage, espacement, étendue, persistance, rugosité, ouverture, etc.) à l’échelle de la falaise de manière à modéliser un réseau de fractures discret, qui permettra de tester la validité des observations faites sur le terrain. A terme, les résultats obtenus généreront des informations très précises sur les liens qui existent entre la fracturation et l’érosion. De ce fait, nous pourrons ainsi quantifier l’influence de la géologie sur la fréquence des chutes de pierres. Ce travail de recherche est la continuation logique du projet FNS en cours n° 200020_146426 et intitulé « High resolution vertical geology for rockfall hazard assessment and 3D geological mapping ».

Contexte scientifique et social du projet de recherche

Aujourd’hui, le couplage de plusieurs techniques de télédétection avec les nuages de points LiDAR semble être la clé du développement de l’approche « vertical geology » et offre de nouvelles possibilités au milieu professionnel pour améliorer l’estimation du risque d’éboulement. De plus, nous pensons que ce projet permettra de compléter les connaissances acquises dans le domaine innovant des « digital outcrop models » afin de mieux préparer les futures recherches dédiées à la caractérisation et à la modélisation des réservoirs fracturés pour l'eau, le pétrole et le gaz.

Direct link to Lay Summary Last update: 04.05.2015

Responsible applicant and co-applicants

Employees

Name Institute

Publications

Publication
Remote thermal detection of exfoliation sheet deformation
Guerin Antoine, Jaboyedoff Michel, Collins Brian D., Stock Greg M., Derron Marc-Henri, Abellán Antonio, Matasci Battista (2020), Remote thermal detection of exfoliation sheet deformation, in Landslides, 1-15.
Quantifying 40 years of rockfall activity in Yosemite Valley with historical Structure-from-Motion photogrammetry and terrestrial laser scanning
Guerin Antoine, Stock Greg M., Radue Mariah J., Jaboyedoff Michel, Collins Brian D., Matasci Battista, Avdievitch Nikita, Derron Marc-Henri (2020), Quantifying 40 years of rockfall activity in Yosemite Valley with historical Structure-from-Motion photogrammetry and terrestrial laser scanning, in Geomorphology, 356, 107069-107069.
Detection of rock bridges by infrared thermal imaging and modeling
Guerin Antoine, Jaboyedoff Michel, Collins Brian D., Derron Marc-Henri, Stock Greg M., Matasci Battista, Boesiger Martin, Lefeuvre Caroline, Podladchikov Yury Y. (2019), Detection of rock bridges by infrared thermal imaging and modeling, in Scientific Reports, 9(1), 13138-13138.
Assessing rockfall susceptibility in steep and overhanging slopes using three-dimensional analysis of failure mechanisms
Matasci Battista, Stock G. M., Jaboyedoff Michel, Carrea Dario, Collins B. D., Guérin Antoine, Matasci G., Ravanel Ludovic (2018), Assessing rockfall susceptibility in steep and overhanging slopes using three-dimensional analysis of failure mechanisms, in Landslides, 15(5), 859-878.
Brief communication: 3-D reconstruction of a collapsed rock pillar from Web-retrieved images and terrestrial lidar data–the 2005 event of the west face of the Drus (Mont Blanc massif)
Guerin Antoine, Abellán Antonio, Matasci Battista, Jaboyedoff Michel, Derron Marc-Henri, Ravanel Ludovic (2017), Brief communication: 3-D reconstruction of a collapsed rock pillar from Web-retrieved images and terrestrial lidar data–the 2005 event of the west face of the Drus (Mont Blanc massif), in Natural Hazards and Earth System Sciences, 17, 1207-1220.
11 years of ground-based lidar monitoring in the West Face of the Drus (Mont-Blanc Massif, France)
Guerin Antoine, Ravanel Ludovic, Matasci Battista, Jaboyedoff Michel, Derron Marc-Henri, Deline Philip (2017), 11 years of ground-based lidar monitoring in the West Face of the Drus (Mont-Blanc Massif, France), in 11 years of ground-based lidar monitoring in the West Face of the Drus (Mont-Blanc Massif, France), International Center for Numerical Methods in Engineering (CIMNE), Barcelona, Spain.
Common problems encountered in 3D mapping of geological contacts using high-resolution terrain and image data
Guerin Antoine, Nguyen Liliane, Abellán Antonio, Carrea Dario, Derron Marc-Henri, Jaboyedoff Michel (2017), Common problems encountered in 3D mapping of geological contacts using high-resolution terrain and image data, in European Journal of Remote Sensing, 48(1), 661-672.
Exfoliation sheets detection with Terrestrial Laser Scanning and thermal imaging (Yosemite Valley, California, USA)
Guerin Antoine, Derron Marc-Henri, Jaboyedoff Michel, Abellan Antonio, Dubas Olivier, Collins Brian, Stock Greg (2016), Exfoliation sheets detection with Terrestrial Laser Scanning and thermal imaging (Yosemite Valley, California, USA), in Exfoliation sheets detection with Terrestrial Laser Scanning and thermal imaging (Yosemite Valley, C, Uni Research CIPR, Bergen, Norway.

Collaboration

Group / person Country
Types of collaboration
U.S. Geological Survey, Landslide Hazards Program, Menlo Park, California United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
U.S. National Park Service, Yosemite National Park, El Portal, California United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Risk Analysis Group, Institute of Earth Sciences, University of Lausanne, Lausanne Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
RocExs 2017 6th Interndisciplinary Workshop on Rockfall Protection (RocExs 2017) Talk given at a conference 11 years of ground-based lidar monitoring in the West Face of the Drus (Mont-Blanc Massif, France 22.05.2017 Barcelone, Spain Jaboyedoff Michel; Guerin Antoine;
European Geosciences Union General Assembly 2017 (EGU 2017) Talk given at a conference Characterization of the deformation and thermal behavior of granitic exfoliation sheets with LiDAR and infrared thermography (Yosemite Valley, USA) 24.04.2017 Vienne, Austria Jaboyedoff Michel; Guerin Antoine; Derron Marc-Henri;
2nd Virtual Geoscience Conference (VGC 2016) Talk given at a conference Exfoliation sheets detection with Terrestrial Laser Scanning and thermal imaging (Yosemite Valley, California, USA) 21.09.2016 Bergen, Norway Guerin Antoine; Derron Marc-Henri; Jaboyedoff Michel;
European Geosciences Union General Assembly 2016 (EGU 2016) Poster Intraday monitoring of granitic exfoliation sheets with LiDAR and thermal imaging (Yosemite Valley, California, USA) 18.04.2016 Vienne, Austria Guerin Antoine; Jaboyedoff Michel; Derron Marc-Henri;


Communication with the public

Communication Title Media Place Year
Media relations: print media, online media Exclusive: Climber Completes the Most Dangerous Rope-Free Ascent Ever National Geographic International 2017
Media relations: radio, television Les Alpes s’effritent France 2 International 2015

Associated projects

Number Title Start Funding scheme
146426 High resolution vertical geology for rockfall hazard assessment and 3D geological mapping 01.06.2013 Project funding (Div. I-III)
146426 High resolution vertical geology for rockfall hazard assessment and 3D geological mapping 01.06.2013 Project funding (Div. I-III)

Abstract

High-resolution imaging of vertical outcrops is now possible because of the new remote sensing techniques. This opens new research domains related to fracture network characterization and vertical geology. The present proposal is the continuation of the project "High resolution vertical geology for rockfall hazard assessment and 3D geological mapping (2013-2015)" in which we are conducting researches about the innovative approach of 3D geology based on 3D point clouds coupled with different types of imaging (high resolution optical image, infrared, etc...), analysis of discontinuity sets depending on rock types, time series of rock fall using diachronic cloud points and modelling of fracture network. This opens new perspectives for erosion of rock walls and rock fall hazards, which will be tackled in this final stage of the research.Mapping geological structures directly on 3D point clouds is possible and will be developed further by coupling point clouds data with different types of images in the framework of the so called “virtual outcrop” topic. Based on that, the structures (discontinuities, folds, etc...) will be analysed. A crucial topic for erosion, rockfall and reservoir characterization is the description of spacing distribution, trace length and shape of discontinuities. This will lead to Discrete Fracture Network modelling (DFN), which allows testing the validity of the observations. The expected results will provide information about erosion promoted by rockfall activity, and input for future research on reservoir characterization.Several sites already monitored or well-studied by our group will be used, such as Yosemite National Park (California), Torres Del Paine National Park (Patagonia), Randa, Les Drus, outcrops of reservoir formation in Tunisia, and other sites where data are already available. In addition to be able to obtain more accurate observations we instrumented a site (La Cornalle cliff) close to Lausanne, in order to image and model the geology and to have very accurate observations of rock wall erosion processes.The main outcome of this project will be providing a very accurate understanding of the erosion of rock walls, based on full and accurate 3D geological models, in order to be able in further projects to tackle the characterization of reservoirs in fractured rocks and to improve the quantification of rockfall erosion.
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