Project

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High resolution vertical geology for rockfall hazard assessment and 3D geological mapping

Applicant Jaboyedoff Michel
Number 146426
Funding scheme Project funding (Div. I-III)
Research institution Inst. de Géomatique & d'Analyse du Risque Fac. des Géosciences & de l'Environnement Université de Lausanne
Institution of higher education University of Lausanne - LA
Main discipline Geology
Start/End 01.06.2013 - 31.08.2015
Approved amount 199'496.00
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All Disciplines (2)

Discipline
Geology
Geomorphology

Keywords (7)

Structural geology; Rockfall hazard; 3D geological mapping; 3D Remote Sensing; Change Detection; Lidar; 3D geology

Lay Summary (French)

Lead
Geologie verticale de haute résolution pour l'étude du danger de chute de blocs et pour la cartographie geologique en 3D.
Lay summary

Ce projet est le prolongement du projet FNS “Rockfall sources: toward accurate frequency estimation and detection”  qui a montré que la susceptibilité au chutes de pierres peut être améliorée en utilisant des informations autres que les relations géométriques des discontinuité. Les types de roches, la géométrie des contacts géologiques, l’état ??d’altération, les voies d'écoulement de l'eau et des conditions thermiques sont des facteurs importants à enquêter. Afin d'obtenir ces informations sur de parois rocheuses hautes et escarpées, ce nouveau projet propose d'utiliser des techniques récentes de télédétection basées au sol. En particulier, l'accent sera mis sur le couplage de données de scanner laser terrestre (LiDAR) avec l'imagerie multispectrale et thermique. Concernant l'évaluation de la susceptibilité au chutes de pierres, ces enquêtes permettront de mieux définir les zones source, les déformation dues au stress thermique, les zones d'érosion préférentielle, les chemins d'écoulement d’eau, les fréquences d'événements et les taux d'érosion. Cette approche ne se limite pas à l'évaluation de chutes de pierres, mais est d'un intérêt primordial pour la géologie verticale, à savoir la cartographie géologique des propriétés de la roche sur des vraies surfaces 3D de haute résolution. L’étude de la géologie verticale permettra de maximiser les informations extraites des parois rocheuses abruptes, afin de les utiliser comme données pour la cartographie géologique et la modélisation 3D.

Plusieurs sites ont été choisis dans le parque de Yosemite (Californie), au Torres del Paine (Chili), dans les Alpes et en France, en fonction des différentes étapes et des objectifs du projet.

Direct link to Lay Summary Last update: 28.03.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Impacts of fracturing patterns on the rockfall susceptibility and erosion rate of stratified limestone
Mastasci Battista (2015), Impacts of fracturing patterns on the rockfall susceptibility and erosion rate of stratified limestone, in Geomorphology, 83-97.
Stability Assessment, Potential Collapses and Future Evolution of the West Face of the Drus (3,754 m a.s.l., Mont Blanc Massif)
Matasci Battista (2015), Stability Assessment, Potential Collapses and Future Evolution of the West Face of the Drus (3,754 m a.s.l., Mont Blanc Massif), in SPRINGER, 791-795.
Discrete fracture network modelling using Coltop3D for rockfall potential assessment at Glacier Point, Yosemite Valley
Grenon Martin (2014), Discrete fracture network modelling using Coltop3D for rockfall potential assessment at Glacier Point, Yosemite Valley, in International Discrete Fracture Network Engineering Conference, 247.
Common problems encountered in 3D mapping of geological contacts using high-resolution terrain and image data
Guerin Antoine, Common problems encountered in 3D mapping of geological contacts using high-resolution terrain and image data, in EUROPEAN JOURNAL OF REMOTE SENSING.
Geological mapping and fold modeling using Terrestrial Laser Scanning point clouds: application to the Dents-du- Midi limestone massif (Switzerland)
Matasci Battista, Geological mapping and fold modeling using Terrestrial Laser Scanning point clouds: application to the Dents-du- Midi limestone massif (Switzerland), in EUROPEAN JOURNAL OF REMOTE SENSING.

Collaboration

Group / person Country
Types of collaboration
NGU: Geological Survey of Norway Norway (Europe)
- in-depth/constructive exchanges on approaches, methods or results
U.S. Geological Survey United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Unité Institut des sciences de la Terre - UNIL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
National Park Service/U.S Departement of Interior United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Associated projects

Number Title Start Funding scheme
144040 Characterizing and analyzing 3D temporal slope evolution 01.12.2012 Project funding (Div. I-III)
127132 Rockfall sources: toward accurate frequency estimation and detection 01.06.2010 Project funding (Div. I-III)
159221 3D geological and structural characterization of rockwalls and rockfall erosion assessment 01.09.2015 Project funding (Div. I-III)
159221 3D geological and structural characterization of rockwalls and rockfall erosion assessment 01.09.2015 Project funding (Div. I-III)

Abstract

This project is the prolongation of the on-going FNS project “Rockfall sources: toward accurate frequency estimation and detection” that has shown that rockfall susceptibility can be improved by using other information than the usual discontinuity sets geometry. Rock types, geological contacts geometry, weathering state, water flow paths and thermal conditions are valuable factors to investigate. In order to get this information on high and steep rock faces, this new project proposes to use recent ground based remote sensing techniques. In particular, the focus will be put on coupling terrestrial laser scanning with multispectral and thermal imaging. For rockfall susceptibility assessment, these investigations will help to better define rock release locations, thermal stress deformation, preferential erosion zones, water flow paths, event frequencies and erosion rates. This approach is not limited to rockfall assessment but of primary interest for vertical geology, i.e. the geological mapping of rock properties on high resolution 3D surfaces. Vertical geology will maximize the information extracted from steep rock walls, in order to use it as input data for 3D geological mapping and modeling.Several sites have been selected according to the different stages and goals of the project. Research works in the Yosemite Valley will continue with the vertical geology approach in order to improve the rockfall hazard mapping. There, a specific emphasize will be put on quantifying effects of thermal variation on rock deformation and rupture by coupling thermal imaging with lidar data. A new field of investigation will start in Torres del Paine (Chile) to get 3D geological maps of igneous intrusion bodies in high vertical walls. Other sites in the Alps and in France, with active rockfalls and excellent outcrop conditions, will be investigated to produce full 3D geological models.
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