Personne
Betty Sovilla
Publications associées (11)
Different erosion and entrainment mechanisms in snow avalanches
Johan Alexandre Philippe Gaume, Betty Sovilla, Xingyue Li
Erosion significantly affects the dynamics of gravity-driven mass flows. In snow avalanches, the snow cover can be substantially eroded but only partially entrained, however, there are very limited investigations to substantiate this difference. Here, we s ...
PERGAMON-ELSEVIER SCIENCE LTD2022Numerical investigation of the effect of cohesion and ground friction on snow avalanches flow regimes
Johan Alexandre Philippe Gaume, Betty Sovilla
With ongoing global warming, snow avalanche dynamics may change as snow cohesion and friction strongly depend on temperature. In the field, a diversity of avalanche flow regimes has been reported including fast, sheared flows and slow plugs. While the sign ...
PUBLIC LIBRARY SCIENCE2022Three-dimensional and real-scale modeling of flow regimes in dense snow avalanches
Johan Alexandre Philippe Gaume, Betty Sovilla, Xingyue Li
Snow avalanches cause fatalities and economic loss worldwide and are one of the most dangerous gravitational hazards in mountainous regions. Various flow behaviors have been reported in snow avalanches, making them challenging to be thoroughly understood a ...
2021The concept of the mobilized domain: how it can explain and predict the forces exerted by a cohesive granular avalanche on an obstacle.
Christophe Ancey, Johan Alexandre Philippe Gaume, Betty Sovilla, Michael Lukas Kyburz
The calculation of the impact pressure on obstacles in granular flows is a fundamental issue of practical relevance, e.g. for snow avalanches impacting obstacles. Previous research shows that the load on the obstacle builds up, due to the formation of forc ...
2021The mechanical origin of snow avalanche dynamics and flow regime transitions
Johan Alexandre Philippe Gaume, Betty Sovilla, Xingyue Li
Snow avalanches cause fatalities and economic damage. Key to their mitigation is the understanding of snow avalanche dynamics. This study investigates the dynamic behavior of snow avalanches, using the material point method (MPM) and an elastoplastic const ...
COPERNICUS GESELLSCHAFT MBH2020Dense flow avalanche pressure on obstacle studied with DEM.
Christophe Ancey, Johan Alexandre Philippe Gaume, Betty Sovilla, Michael Lukas Kyburz
Snow avalanches are a major hazard in mountainous areas and have a significant impact on infrastructures, economy and tourism of such regions. Obtaining a thorough understanding on the pressure exerted by avalanches on infrastructures is crucial for the de ...
2018Granulation of snow: From tumbler experiments to discrete element simulations
Michael Lehning, Johan Alexandre Philippe Gaume, Betty Sovilla, Walter Steinkogler
It is well known that snow avalanches exhibit granulation phenomena, i.e., the formation of large and apparently stable snow granules during the flow. The size distribution of the granules has an influence on flow behavior which, in turn, affects runout di ...
2015Quantifying snowfall and avalanche release synchronization: a case study
Paolo Perona, Benoît Crouzy, Betty Sovilla, Romain Forclaz
We quantify the synchronization between snowfall and natural avalanches in relation to terrain properties at the detachment zone. We analyze field statistics of 549 avalanche events in terms of slope, aspect, timing, coordinate, and release area, identifie ...
Wiley-Blackwell2015Influence of snow cover properties on avalanche dynamics
Michael Lehning, Betty Sovilla, Walter Steinkogler
The destructive power of an avalanche depends, among other things, on the overall mass and the snow conditions in the avalanche path. So far, the knowledge on the effect of snow conditions on avalanche behavior is limited and largely qualitative. We invest ...
Elsevier Science Bv2014Taking Into Account Wet Avalanche Load for the Design of Pylon-like Structures.
Christophe Ancey, Betty Sovilla
Wet snow avalanches interact with infrastructures around the world but their significance on the structure design is frequently neglected due to the low velocity, which characterize the flow and thus the expected low impact pressures. Recent pressure measu ...
2014