  For the 2007 International Forum on Landslide Disaster Management framework,
our team performed several numerical simulations on both theoretical and
natural cases of granular flows. The objective was to figure out the ability
and the limits of our numerical model in terms of reproduction and prediction.
Our benchmarking exercises show that for almost all the cases, the model we use
is able to reproduce observations at the field scale. Calibrated friction
angles are almost similar to that used in other models and the shape of the
final deposits is in good agreement with observation. However, as it is tricky
to compare the dynamics of natural cases, these exercises do not allow us to
highlight the good ability to reproduce the behavior of natural landslides.
Nevertheless, by comparing with analytical solution, we show that our model
presents very low numerical dissipation due to the discretization and to the
numerical scheme used. Finally, in terms of mitigation and prediction, the
different friction angles used for each cases figure out the limits of using
such model as long as constitutive equations for granular media are not known.
