Abstract
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.
Highlights
The frictional properties of model granular matter have long been perplexing experimentalists and numericians alike, even in the simplest idealised flow configurations involving the simplest idealised beads
The nature of the grains, their various size and shapes, the various triggering contexts, underlying processes and topography covered make the attempt at aiming at a good guess for their apparent friction properties look like a reverie, as nicely put by Ha↵ warning us of the limitations of predictive modelling in Geomorphology [2]
In this contribution, we question the frictional properties of a granular mass flowing down an idealised topography, and try to relate them to topography characteristics and final deposit geometry
Summary
The frictional properties of model granular matter have long been perplexing experimentalists and numericians alike, even in the simplest idealised flow configurations involving the simplest idealised beads. The nature of the grains, their various size and shapes, the various triggering contexts, underlying processes and topography covered make the attempt at aiming at a good guess for their apparent friction properties look like a reverie, as nicely put by Ha↵ warning us of the limitations of predictive modelling in Geomorphology [2] In this contribution, we question the frictional properties of a granular mass flowing down an idealised topography, and try to relate them to topography characteristics and final deposit geometry. We turn towards simulations to analyse the frictional behaviour of the granular mass in terms of stress state, and compare it with the geometrical estimation given by the mobility μe f f = 1/M
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