Abstract: The seismic waves generated by landslides may have an effect on landslide dynamics. This effect has frequently be invoked to explain the high mobility of large landslides. It has however never been quantified. The challenge of this PhD is to couple granular flow models and acoustic wave propagation codes to quantify the effect of the waves generated by the flow on the flow dynamics itself. This work will be performed through a collaboration between mathematicians, geophysicists and physicists within the framework of the ERC project SLIDEQUAKES.
Discrete Elements Modeling: In collaboration with Bertrand MAURY and Aline LEFEBVRE-LEPOT. We are developping a new Discrete Element Method to take into account of the friction effects between rigid spheres in a non-linear model based on the work of Bertrand MAURY in 2005. The aim is to build a numerical scheme to prevent ovelaps between beads independently from the time-step values, allowing the use of big time steps during time integration. A numeric code has been developed: Few examples of numerical simulations: The color scale of beads is the velocity norm:
Simulations by Discrete Elements Method, comparison with experimental data: We used the code MODY-GS, a Molecular Dynamics model develloped by Patrick RICHARD to compare simulations of granular column collapse with experiments realised by Maxime FARIN.