Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
doi:10.5194/nhess-2017-29
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
16 Feb 2017
Review status
This discussion paper is under review for the journal Natural Hazards and Earth System Sciences (NHESS).
UAV-enabled reconnaissance and trajectory modeling of a co-seismic rockfall in Lefkada
Charalampos Saroglou1, Pavlos Asteriou1, Dimitris Zekkos2, George Tsiambaos1, Marin Clark3, and John Manousakis4 1Department of Geotechnical Engineering, School of Civil Engineering, National Technical University of Athens
2Department of Civil and Environmental Engineering, University of Michigan, USA
3Department of Earth and Environmental Science, University of Michigan, USA
4Elxis Group, S.A, Athens, Greece
Abstract. The paper presents the field evidence and the kinematical study of the motion of a rock block mobilised by an earthquake-induced rockfall in Ponti area in the island of Lefkada during a Mw 6.5 earthquake on 17th November 2015. A detailed field survey was deployed using an Unmanned Aerial Vehicle (UAV) with an ultra-high definition (UHD) camera, which produced a high-resolution orthophoto and a Digital Surface Model (DSM) of the terrain. The sequence of impact marks from the rock trajectory on the ground surface was identified using the orthophoto and verified through a detailed field survey. Additionally, the earthquake characteristics were determined in order to define the acceleration on the rock slope and the initial conditions of the detached block. Using the impact points from the actual rockfall trajectory, an analytical approach to reconstruct the trajectory was implemented, which led to some insights on the coefficients of restitution. In order to match the actual trajectory, 2D and 3D rockfall analyses were performed using the recommended set of parameters. However, the actual trajectory could not be accurately predicted, revealing limitations of existing models.

Citation: Saroglou, C., Asteriou, P., Zekkos, D., Tsiambaos, G., Clark, M., and Manousakis, J.: UAV-enabled reconnaissance and trajectory modeling of a co-seismic rockfall in Lefkada, Nat. Hazards Earth Syst. Sci. Discuss., doi:10.5194/nhess-2017-29, in review, 2017.
Charalampos Saroglou et al.
Charalampos Saroglou et al.
Charalampos Saroglou et al.

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Short summary
The paper presents field evidence and a kinematical study of the motion of co-seismic rockfall during a Mw 6.5 earthquake in Lefkada island in 2015. A detailed field survey using an Unmanned Aerial Vehicle (UAV) was deployed. Using the impact points from the actual rockfall trajectory, an analytical approach to reconstruct the trajectory was implemented, using 2D, 3D and kinematic analyses. The actual trajectory could not be accurately revealing limitations of existing models.
The paper presents field evidence and a kinematical study of the motion of co-seismic rockfall...
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