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Inferring spatial variations in velocity profiles and bed geometry of natural debris flows based on discharge estimates from high-frequency 3D LiDAR point clouds; Illgraben, Switzerland
(2023)E3S Web of Conferences ~ Proceedings of the Eight International Conference on Debris-Flow Hazard MitigationMore detailed field measurements are required for a better understanding of surging debris flows. In this work, we analyze a debris flow at the field-scale using timelapse point clouds from a high-resolution, high-frequency 3D LiDAR sensor, which has been installed over a check dam on the fan of the Illgraben catchment in Switzerland. In our investigations, we manually measured the front velocity and tracked individual features such as ...Conference Paper -
Analysis of superelevation and debris flow velocities at Illgraben, Switzerland
(2023)E3S Web of Conferences ~ Proceedings of the Eight International Conference on Debris-Flow Hazard MitigationThe forced vortex equation, based on the cross-stream inclination of a flow surface as it passes through a bend, is a common approach to estimating debris flow velocities. Here, we present the preliminary results of a study of superelevation and the correction factor k, used to adapt the forced vortex equation to debris flows, based on data from the Illgraben torrent in Switzerland. The definition of the radius of curvature, a factor in ...Conference Paper -
DEFLOW: Self-supervised 3D Motion Estimation of Debris Flow
(2023)2023 IEEE/CVF Conference on Computer Vision and Pattern Recognition Workshops (CVPRW)Existing work on scene flow estimation focuses on autonomous driving and mobile robotics, while automated solutions are lacking for motion in nature, such as that exhibited by debris flows. We propose DEFLOW, a model for 3D motion estimation of debris flows, together with a newly captured dataset. We adopt a novel multi-level sensor fusion architecture and self-supervision to incorporate the inductive biases of the scene. We further adopt ...Conference Paper -
Debris-flow monitoring with high-frequency LiDAR scanners: A new method to infer the internal dynamics of debris flows
(2023)E3S Web of Conferences ~ Proceedings of the Eight International Conference on Debris-Flow Hazard MitigationIn-situ measurements of debris-flow properties are crucial for understanding their movement mechanisms and quantifying their impact. Here we present the first results of a field monitoring campaign, at Illgraben, Switzerland, to measure debris-flow parameters using high temporal (10 Hz) and spatial resolution LiDAR sensors at several locations along the channel. The point cloud data is projected onto video images to enhance visualization ...Conference Paper -
Development of a universal open access rock avalanche case study database
(2021)13th International Symposium on LandslidesConference Paper -
Empirical relationships to estimate the probability of runout exceedance for various landslide types
(2020)ICL Contribution to Landslide Disaster Risk Reduction ~ Understanding and Reducing Landslide Disaster Risk. Volume 2: From Mapping to Hazard and Risk ZonationEstimating the potential runout distance of a landslide and it associated impacted area is an important component of landslide hazard and risk analysis. This can be done using empirical; or physics-based runout analysis methods. The current study uses the empirical method by compiling previously published international examples of landslide runout and unpublished New Zealand landslides triggered by recent earthquakes and rainstorm events. ...Conference Paper -
Preliminary Calibration of a Numerical Runout Model for Debris Flows in Southwestern British Columbia
(2019)Debris-flow Hazards Mitigation: Mechanics, Monitoring, Modeling, and Assessment; Proceedings of the Seventh International Conference on Debris-Flow Hazards Mitigation, Golden, Colorado, USA, June 10-13, 2019Conference Paper -
Development of a systematic approach to calibrate equivalent fluid runout models
(2016)Landslides and Engineered Slopes. Experience, Theory and Practice: Proceedings of the 12th International Symposium on Landslides (Napoli, Italy, 12-19 June 2016)Extremely rapid flow-like landslides pose a significant hazard worldwide, however the analysis of the impact area and velocity of these flows is not routine. Semi-empirical equivalent fluid models are one of the most promising tools for performing this sort of analysis. These models are physically based, however certain parameters are determined through model calibration, using back-analysis of real landslide cases. The present analysis ...Conference Paper -
Re-examination of the dynamics of the 2012 Johnsons Landing debris avalanche
(2016)Proceedings of 69th Canadian Geotechnical Conference (GeoVancouver 2016)Conference Paper