A5055360572- Landslides and related hazards
- Fire effects on ecosystems
- Soil and Unsaturated Flow
- Groundwater flow and contamination studies
- Cryospheric studies and observations
- Tunneling and Rock Mechanics
- Rock Mechanics and Modeling
- Granular flow and fluidized beds
- Hydrology and Sediment Transport Processes
- Geotechnical and Geomechanical Engineering
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Winter Sports Injuries and Performance
Center for Snow and Avalanche Studies
2022
Swiss Federal Institute for Forest, Snow and Landscape Research
2019
Abstract The mitigation of rapid mass movements involves a subtle interplay between field surveys, numerical modelling, and experience. Hazard engineers rely on combination best practices and, if available, historical facts as vital prerequisite in establishing reproducible accurate hazard zoning. Full-scale tests have been performed to reinforce the physical understanding debris flows snow avalanches. Rockfall dynamics are - especially quantification energy dissipation during complex...
Abstract We propose a dilatant, two-layer debris flow model validated by full-scale density/saturation measurements obtained from the Swiss Illgraben test site. Like many existing models, we suppose consists of matrix solid particles (rocks and boulders) that is surrounded muddy fluid. However, split fluid into two fractions. One part, inter-granular fluid, bonded to fills void space between particles. The combination material forms first layer flow. second part not can move independently...
Abstract We formulate and test different Voellmy-type mixture rheologies that can be introduced into two-layer debris flow models. The formulations are based on experimental data from the Swiss Illgraben site as well mathematical constraints in steady conditions. In agreement with ideas of Iverson, we show uniform, fixed rheological models cannot accurately represent changing frictional resistance when flows undergo spatial temporal changes solid–fluid composition. Indeed, results indicate...
Abstract Glacier lake outburst floods (GLOFs) initiate with the rapid of a glacier lake, endangering downstream populations, land, and infrastructure. The flow initiates as mud flow; however, entrainment additional solid material, flood will often transform into debris flow. As run-out slope flattens, coarse material deposits de-waters. transforms back muddy, hyperconcentrated fine sediments in suspension. These transitions change composition dramatically influence both overall mass balance...
We propose a dilatant, two-layer debris flow model validated by full scale density/saturation measurements obtained from the Swiss Illgraben test site. Like many existing models we suppose consists of matrix solid particles (rocks, boulders) that is surrounded muddy fluid. However, split fluid into two fractions. One part, inter-granular fluid, bonded to and fills void space between particles. The combination material forms first layer flow. second part not can move independently layer. This...
Research on rockfalls and prevention of the associated damages is becoming increasingly important active particularly due to often climate-change-or earthquakeinduced rock fragmentation in mountainous regions.Application novel numerical methods rock-tree/forest interactions simulation an part rockfall dynamics modelling, because understanding these issues would potentially improve counter-measures management hazards mitigation levels.Hence this work non-smooth mechanics coupled with hard...
<p>Since 2004, observations of shear and normal stresses have been collected at the base naturally-triggered debris flows Illgraben observation station (Wallis, Switzerland) [1].   Because flow height force are simultaneously measured, limited basal fluid pore pressure available, it is possible to investigate how solid/fluid contents influence measured stress.  The experimental results emphasized two properties: (1) Debris characterized by...
<p>The runout behaviour of debris flows is strongly governed by their solid-fluid composition.  In mitigation projects it often necessary to predict when the solid phase deposits and if there exists possibility fluid washes.  The composition in zone controls size type measures, as well how land zoned around a specific torrent.  This problem extremely difficult solve general terrain because difficulty establish initial conditions for both...
<p>Guillaume Meyrat, Brian McArdell, Ksenyia Ivanova, Perry Bartelt</p><p>WSL Institute for Forest, Snow and Landscape Research, 8903 Birmensdorf, Switzerland</p><p> </p><p><strong>Keywords</strong>: Debris flows, multi-phase models, dilatancy, shear stress, density...