https://doi.org/10.1051/epjconf/202124913002
Mobilisation of friction in unstationary flows down a model topography
1
Ecole Normale Supérieure de Lyon, 69342 Lyon, France
2
Institut d’Alembert - CNRS - Université Paris Sorbonne, 75252 Paris, France
* e-mail: baptiste.blachier@ens-lyon.fr
** e-mail: lydie.staron@upmc.fr
Published online: 7 June 2021
The frictional behaviour of a series of numerical 2D granular mass flows down a model topography is analysed. Effective friction coefficients estimated from final deposits are compared with data from documented natural geophysical flows, and show a consistent behaviour as far as run-out distances are concerned. The latter is used to estimate effective friction coefficients which capture well the frictional behaviour derived from the computation of micro-mechanical stress tensors near the gravity centre. Distinguishing between the different parts of the mass while spreading, we show that the downstream part of the flow exhibits a much larger friction than the core and the tail. A dependence between friction and flow volume is however observed in each region.
A video is available at https://doi.org/10.48448/e1zc-v309
© The Authors, published by EDP Sciences, 2021
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
