. Si-on, enjeu principal de cetté etude, qui est l'´ etablissement de lois rhéologiques, on peut se demander, avant d'aller plus en avant vers uné etude desécoulements desécoulements polydisperses en taille, si ces lois seront valables seulement pour un type de géométrie d'´ ecoulement

B. Aguirre, I. Ippolito, A. Calvo, C. Henrique, and D. Bideau, Effects of geometry on the characteristics of the motion of a particle rolling down a rough surface, Powder Technology, vol.92, issue.1, pp.75-80, 1997.
DOI : 10.1016/S0032-5910(97)03231-2

C. E. Ahn, R. H. Brennen, and . Sabersky, Measurements of velocity , velocity fluctuation, density and stresses in chute flows of granular materials Motion of a single bead on a bead row : theoretical investigations, ASME, J. Appl. Mech. J. Phys. I, vol.6, pp.725-751, 1996.

]. G. Batrouni, S. Dippel, and L. Samson, Stochastic model for the motion of a particle on an inclined rough plane and the onset of viscous friction, Physical Review E, vol.53, issue.6, pp.66496-066503, 1996.
DOI : 10.1103/PhysRevE.53.6496

]. L. Bocquet, J. Errami, and T. C. Lubensky, Hydrodynamic Model for a Dynamical Jammed-to-Flowing Transition in Gravity Driven Granular Media, Physical Review Letters, vol.89, issue.18, p.184301, 2002.
DOI : 10.1103/PhysRevLett.89.184301

C. S. Campbell, P. W. Cleary, and M. Hopkins, Large-scale landslide simulations: Global deformation, velocities and basal friction, Journal of Geophysical Research: Solid Earth, vol.23, issue.2, p.8267, 1995.
DOI : 10.1029/94JB00937

]. F. Cantelaube and D. Bideau, Radial Segregation in a 2d Drum: An Experimental Analysis, Europhysics Letters (EPL), vol.30, issue.3, p.133, 1995.
DOI : 10.1209/0295-5075/30/3/002

]. Cruz, ´ Ecoulements de grains secs : Frottement et blocage, Thèse, Ecole Nationale des Ponts et Chaussées, 2004.

]. S. Dippel, G. G. Batrouni, and D. E. Wolf, How transversal fluctuations affect the friction of a particle on a rough incline, Physical Review E, vol.56, issue.3, pp.3645-3656, 1997.
DOI : 10.1103/PhysRevE.56.3645

]. S. Dippel and D. E. Wolf, Molecular dynamics simulations of granular chute flow, Computer Physics Communications, vol.121, issue.122, pp.284-289, 1999.
DOI : 10.1016/S0010-4655(99)00332-X

]. S. Dippel, G. G. Batrouni, and D. E. Wolf, Collision-induced friction in the motion of a single particle on a bumpy inclined line, Physical Review E, vol.54, issue.6, pp.6845-6856, 1996.
DOI : 10.1103/PhysRevE.54.6845

J. A. Drahun and J. Bridgwater, The mechanisms of free surface segregation, Powder Technology, vol.36, issue.1, pp.39-53, 1983.
DOI : 10.1016/0032-5910(83)80007-2

T. G. Drake, Granular flow: physical experiments and their implications for microstructural theories, Journal of Fluid Mechanics, vol.21, issue.-1, pp.121-152, 1991.
DOI : 10.1017/S002211208800103X

]. D. Ertas, G. S. Grest, T. C. Halsey, D. Levine, and L. E. Silbert, Gravity-driven dense granular flows, Europhysics Letters (EPL), vol.56, issue.2, pp.214-220, 2001.
DOI : 10.1209/epl/i2001-00508-7

]. D. Ertas and T. C. Halsey, Granular gravitational collapse and chute flow, Europhysics Letters (EPL), vol.60, issue.6, p.931, 2002.
DOI : 10.1209/epl/i2002-00307-8

G. Félix and N. Thomas, Relation between dry granular flow regimes and morphology of deposits: formation of lev??es in pyroclastic deposits, Earth and Planetary Science Letters, vol.221, issue.1-4, pp.197-213, 2004.
DOI : 10.1016/S0012-821X(04)00111-6

G. Félix and N. Thomas, Evidence of two effects in the size segregation process in dry granular media, 22] GdR MiDi (article collectif), On dense granular flows, 2004.
DOI : 10.1103/PhysRevE.70.051307

J. M. Gray, M. Wieland, and K. Hutter, Gravity-driven free surface flow of granular avalanches over complex basal topography, Proc. R. Soc. Lond. A 455, pp.1841-1874, 1999.
DOI : 10.1098/rspa.1999.0383

]. R. Greve, T. Koch, and K. Hutter, Unconfined flow of granular avalanches along a parly curved suface, part 1 and 2, Proc. R. Soc. Lond. A 445, pp.399-413, 1994.

T. C. Halsey and A. J. Levine, How Sandcastles Fall, Physical Review Letters, vol.80, issue.14, p.3141, 1998.
DOI : 10.1103/PhysRevLett.80.3141

C. Henrique, M. A. Aguirre, A. Calvo, I. Ippolito, S. Dippel et al., Energy dissipation and trapping of particles moving on a rough surface, Physical Review E, vol.57, issue.4, pp.4743-4750, 1998.
DOI : 10.1103/PhysRevE.57.4743

K. M. Hill, A. Caprihan, and J. Kakalios, Axial segregation of granular media rotated in a drum mixer:???Pattern evolution, Physical Review E, vol.56, issue.4, pp.4386-4393, 1997.
DOI : 10.1103/PhysRevE.56.4386

]. O. Hungr and N. R. Morgenstern, Experiments on the flow behaviour of granular materials at high velocity in an open channel, G??otechnique, vol.34, issue.3, pp.405-413, 1984.
DOI : 10.1680/geot.1984.34.3.405

H. M. Jaeger, S. R. Nagel, and R. P. Behringer, Granular solids, liquids and gases, Rev. Modern Phys, pp.1259-1273, 1996.

H. M. Jaeger, C. H. Liu, and S. R. Nagel, Friction in Granular Flows, Europhysics Letters (EPL), vol.11, issue.7, p.619, 1990.
DOI : 10.1209/0295-5075/11/7/007

P. C. Johnson, P. Nott, and R. Jackson, Frictional???collisional equations of motion for participate flows and their application to chutes, Journal of Fluid Mechanics, vol.20, issue.-1, pp.501-535, 1990.
DOI : 10.1017/S0022112079000525

]. R. Jullien, P. Meakin, and A. Pavlovitch, Three-dimensional model for particle-size segregation by shaking, Physical Review Letters, vol.69, issue.4, pp.640-643, 1992.
DOI : 10.1103/PhysRevLett.69.640

J. B. Knight, H. M. Jaeger, and S. R. Nagel, Vibration-induced size separation in granular media: The convection connection, Physical Review Letters, vol.70, issue.24, pp.3728-3731, 1993.
DOI : 10.1103/PhysRevLett.70.3728

S. C. Louge and . Keast, On dense granular flows down flat frictional inclines, Physics of Fluids, vol.13, issue.5, pp.1213-1233, 2001.
DOI : 10.1063/1.1358870

C. K. Lun and A. A. Bent, Numerical simulation of inelastic frictional spheres in a simple shear flow model, J. Fluid Mech, pp.335-353, 1994.

M. Naaim, S. Vial, and R. Couture, Saint-Venant approach for rock avalanches modelling, 1997.

E. G. Onoda and . Liniger, Random loose packings of uniform spheres ans the dilatancy onset, Phys. Rev. Lett, pp.86-111, 2001.

A. V. Orpe and D. V. Kakhar, Scaling relations for granular flow in quasi-two-dimensional rotating cylinders, Physical Review E, vol.64, issue.3, p.31302, 2001.
DOI : 10.1103/PhysRevE.64.031302

J. S. Patton, C. E. Brennen, and R. H. Sabersky, Shear Flows of Rapidly Flowing Granular Materials, Journal of Applied Mechanics, vol.54, issue.4, p.119, 1987.
DOI : 10.1115/1.3173120

]. O. Pouliquen, J. Delour, and S. B. Savage, Fingering in granular flows, Nature, vol.386, issue.6627, pp.816-817, 1997.
DOI : 10.1038/386816a0

]. O. Pouliquen, Scaling laws in granular flows down rough inclined planes, Physics of Fluids, vol.11, issue.3, pp.542-548, 1999.
DOI : 10.1063/1.869928

]. O. Pouliquen, On the shape of granular fronts down rough inclined planes, Physics of Fluids, vol.11, issue.7, pp.1956-1958, 1999.
DOI : 10.1063/1.870057

O. Pouliquen and Y. Forterre, Friction law for dense granular flows: application to the motion of a mass down a rough inclined plane, Journal of Fluid Mechanics, vol.453, pp.133-151, 2002.
DOI : 10.1017/S0022112001006796
URL : https://hal.archives-ouvertes.fr/hal-00135182

O. Pouliquen and F. Chevoir, Dense flows of dry granular material, Comptes Rendus Physique, vol.3, issue.2, pp.163-175, 2002.
DOI : 10.1016/S1631-0705(02)01309-9

]. O. Pouliquen, J. Delour, and S. B. Savage, Fingering in granular flows, Nature, vol.386, issue.6627, pp.816-818, 1997.
DOI : 10.1038/386816a0

O. Pouliquen and J. W. Vallance, Segregation induced instabilities of granular fronts, Chaos: An Interdisciplinary Journal of Nonlinear Science, vol.9, issue.3, pp.621-62, 1999.
DOI : 10.1063/1.166435

K. Ridgway and R. Rupp, Flow of granular material down chutes, Chemical and Process Eng, pp.82-85, 1970.

F. X. Riguidel, A. Hansen, and D. Bideau, Gravity-Driven Motion of a Particle on an Inclined Plane with Controlled Roughness, Europhysics Letters (EPL), vol.28, issue.1, p.13, 1994.
DOI : 10.1209/0295-5075/28/1/003

F. X. Riguidel, R. Jullien, G. Ristow, A. Hansen, and D. Bideau, Behaviour of a sphere on a rough inclined plane, Journal de Physique I, vol.4, issue.2, p.261, 1994.
DOI : 10.1051/jp1:1994106
URL : https://hal.archives-ouvertes.fr/jpa-00246903

D. A. Robinson and S. P. Friedman, Observations of the effects of particle shape and particle size distribution on avalanching of granular media, Physica A: Statistical Mechanics and its Applications, vol.311, issue.1-2, pp.97-110, 2002.
DOI : 10.1016/S0378-4371(02)00815-4

G. Sansoni, M. Carocci, and R. Rodella, 3D vision based on the combination of gray code and phase shift light projection : analysis and compensation of the systematic errors, Appl. Opt, vol.31, pp.6565-6573, 1999.

A. C. Santomaso and P. Canu, Transition to movement in granular chute flows, Chemical Engineering Science, vol.56, issue.11, pp.3563-3573, 2001.
DOI : 10.1016/S0009-2509(01)00026-4

S. B. Savage and K. H. Hutter, The motion of a finite mass of granular material down a rough incline, Journal of Fluid Mechanics, vol.196, issue.-1, p.177, 1989.
DOI : 10.1007/BF01180101

S. B. Savage and C. K. Lun, Particle size segregation in inclined chute flow of dry cohesionless granular solids, Journal of Fluid Mechanics, vol.49, issue.-1, pp.311-335, 1988.
DOI : 10.1021/i160053a004

S. B. Savage, Gravity flow of cohesionless granular materials in chutes and channels, Journal of Fluid Mechanics, vol.91, issue.01, pp.53-96, 1979.
DOI : 10.1088/0508-3443/16/12/313

S. L. Silbert, J. W. Landry, and G. S. Grest, Granular flow down a rough inclined plane: Transition between thin and thick piles, Physics of Fluids, vol.15, issue.1, pp.1-10, 2003.
DOI : 10.1063/1.1521719

S. L. Silbert, D. Ertas, G. S. Grest, T. C. Halsey, and D. Levine, Analogies between granular jamming and the liquid-glass transition, Physical Review E, vol.65, issue.5, p.51307, 2002.
DOI : 10.1103/PhysRevE.65.051307

S. L. Silbert, D. Ertas, G. S. Grest, T. C. Halsey, D. Levine et al., Granular flow down an inclined plane, Phys. Rev. E, vol.64, pp.385-403, 2001.

S. L. Silbert, G. S. Grest, S. J. Plimpton, and D. Levine, Boundary effects and self-organisation in dense granular flows, Phys, p.14, 2002.

]. K. Takahashi, On the dynamical properties of granular mass, Geophys . Mag, vol.11, pp.165-176, 1937.

]. T. Takahashi, Debris Flows, Annu. Rev. Fluid Mech, vol.67, issue.13, p.57, 1981.

G. L. Vasconcelos and J. J. Veerman, Geometrical model for a particle on a rough inclined surface, Physical Review E, vol.59, issue.5, pp.5641-5646, 1999.
DOI : 10.1103/PhysRevE.59.5641