Tag Archives: rock slope

Inspection of the Brenva spur (Mt Blanc, Italy)

In collaboration with the Fondazione Montagna Sicura, Michel Jaboyedoff, Antoine Guerin and Li Fei went to Entrèves (Aosta Valley, Italy) on 23 October 2018 to investigate the 1997 Brenva rockslide scar (3’870 m, Mont-Blanc massif), which reactivated in September 2016. A helicopter flight of about 25 minutes allowed acquiring hundreds of pictures (digital and thermal) of the rock mass in exceptional conditions, as the high mountain was dry in late autumn 2018. A high-resolution Structure-from-Motion model was then generated using these pictures, allowing us to analyze in detail the structural features and rockfall activity of the Sperone della Brenva.

View of the Mt BLanc and Brenva spur

3D point cloud model obtained by photogrammetry

On the impact of our research in Natural Hazards journals

Good news! The number of citations that we are receiving concerning Natural Hazards related journals is considerably increasing… For the past five years we have had the 2nd most cited paper in Natural Hazards journal (Springer)

We also obtained not bad results concerning Natural Hazards and Earth System Sciences journal (Copernicus): have a look at the 4th and 5th most cited papers in the last five years

NATURAL HAZARDS: http://scholar.google.ch/citations?hl=fr&view_op=list_hcore&venue=PcS0bsTK_5IJ.2014

NATURAL HAZARDS & EARTH SYSTEM SCIENCE: http://scholar.google.ch/citations?hl=fr&view_op=list_hcore&venue=EKUCyVlF5DoJ.2014


New publication in Computer and Geosciences

A new approach for semi-automatic rock mass joints recognition from 3D point clouds

Riquelme, A., Abellan, A., Tomás, R., Jaboyedoff, M (2014). A new approach for semi-automatic rock mass joints recognition from 3D point clouds. Computers & Geosciences, 68(0), pp.38–52. DOI: 10.1016/j.cageo.2014.03.014

In this paper we present a semi-authomatic methodology for the identification and analysis of flat surfaces outcropping in rocky slopes from 3D point clouds. The method is based on a three steps process: (i) to carry out a nearest neighbour points coplanarity test and to computate the normal vector; (ii) to find the principal orientation families by Kernel Density Estimation; and (iii) to identify and extract clusters of points belonging to the same discontinuity.

Different sources of information – synthetic and 3D scanned data – were employed in this study, being raw source files and obtained results freely provided aiming to a more reproducible research.

Discontinuity extraction
Example of clusters identification. (a) One colour per discontinuity set with all clusters labelled; from (b) to (f) family sets representation using one colour per cluster (Riquelme et al., 2014).

New publication: ESPL state of science (terrestrial LiDAR on rock slopes)

Abellán, A., Oppikofer, T., Jaboyedoff, M., Rosser, N. J., Lim, M. and Lato, M. J. (2014), Terrestrial laser scanning of rock slope instabilities. Earth Surf. Process. Landforms. DOI: 10.1002/esp.3493

This manuscript presents a review on the application of a remote sensing technique (terrestrial laser scanning, TLS) to a rock slope characterization and monitoring. Key insights into the use of TLS in rock slope investigations include: (a) the capability of remotely obtaining the orientation of slope discontinuities, which constitutes a great step forward in rock mechanics; (b) the possibility to monitor rock slopes which allows not only the accurate quantification of rockfall rates across wide areas but also the spatio-temporal modelling of rock slope deformation with an unprecedented level of detail.

Further investigation on the development of new algorithms for point cloud filtering, segmentation, feature extraction, deformation tracking and change detection will significantly improve our understanding on how rock slopes behave and evolve.

Perspectives include the use of new 3D sensing devices and the adaptation of techniques and methods recently developed in other disciplines as robotics and 3D computer-vision to rock slope instabilities research.

More information and full paper on the ESPL website.