Debris Flow Modelling Accounting For Large
Boulder Transport
Author(s)
C. Martinez, F. Miralles-Wilhelm & R. Garcia-Martinez
Abstract
We present a quasi three-dimensional numerical model to simulate stony debris
flows, considering a continuum fluid phase of water and fine sediments, and a
non-continuum phase of large particles, such as boulders. Large particles are
treated in a Lagrangian frame of reference using the Discrete Element Method in
three dimensions. The fluid phase is governed by the depth-averaged
Navier–Stokes equations in two horizontal dimensions and is solved by the
Finite Element Method. The model simulates particle-particle collisions and
wall-particle collisions, taking into account that particles are immersed in the
fluid. Bingham and Cross rheological models are used for the continuum phase.
Both formulations provide stable results, even in the range of very low shear
rates. The Bingham formulation is better able to simulate the stopping stage of
the fluid. The results of the numerical simulations are compared with data from
laboratory experiments on a flume-fan model. The results show that the model is
capable of simulating the motion of big particles moving in the fluid flow,
handling dense particulate flows that avoid overlapping among particles. An
application to simulate a debris flow event that occurred in Northern Venezuela
in 1999 shows that the model replicates well the main observed boulder
accumulation areas.
Keywords: debris flow, mud flow, boulders transport, Eulerian and Lagrangian
formulation, finite element method, discrete element method.
Keywords
debris flow, mud flow, boulders transport, Eulerian and Lagrangian
formulation, finite element method, discrete element method
Related Book
Other papers in this volume
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