. B. Fig, 5: Spatiotemporal autocorrelation diagram for the bed surface elevation b s . Image dimensions: ?x = 100 mm, ?t = 2 s. Correlation coefficient: ?0.27 ? I ? +1

R. Ancey, F. Bigillon, P. Frey, R. Ducret, and J. Lanier, Saltating motion of a bead in a rapid water stream, Physical Review E, vol.66, issue.3, p.36306, 2002.
DOI : 10.1103/PhysRevE.66.036306

F. [. Ancey, P. Bigillon, R. Frey, and . Ducret, Rolling motion of a bead in a rapid water stream, Physical Review E, vol.67, issue.1, p.11303, 2003.
DOI : 10.1103/PhysRevE.67.011303

[. Asce, Task committee of computational modeling of sediment transport processes, Journal of Hydraulic Engineering, vol.130, pp.597-598, 2004.

]. E. Aza98 and . Azanza, Ecoulements granulaires bidimensionnels sur un plan incliné, 1998.

P. Ancey, J. L. Frey, C. Reboud, and . Ducottet, Fluctuations of the solid discharge of gravity-driven particle flows in a turbulent stream, Physical Review E, vol.69, p.61307, 2004.

. Baf-+-05-]-t, C. Böhm, P. Ancey, M. Frey, J. L. Jodeau et al., Experiments on gravity-driven particle flows in a turbulent stream, Powders and Grains, 2005.

]. R. Bag56 and . Bagnold, The flow of cohesionless grains in fluids, Series A: Mathematical an Physical Sciences, p.235297, 1956.

J. [. Bezzola, M. Abegg, and . Jaeggi, Saltinabrücke Brig- Glis, Rekonstruktion des Hochwassers vom 24 in Brig-Glis, Schweizer Ingenieur und Architekt, vol.11, pp.165-169, 1993.

C. Barat, C. Ducottet, and M. Jourlin, Pattern matching using morphological probing, Proceedings 2003 International Conference on Image Processing (Cat. No.03CH37429), 1925.
DOI : 10.1109/ICIP.2003.1246975

P. [. Böhm, C. Frey, C. Ducottet, J. L. Ancey, and . Reboud, Twodimensional motion of a set of particles in a free surface flow with image processing

A. [. Bideau and . Hansen, Disorder and granular media, 1993.

]. F. Big01 and . Bigillon, Etude du mouvement bidimensionnel d'une particule dans un courant d'eau sur forte pente, 2001.

D. [. Buffington and . Montgomery, A systematic analysis of eight decades of incipient motion studies, with special reference to gravel-bedded rivers, Water Resources Research, vol.33, 1997.

A. [. Balmforth and . Provenzale, Patterns of Dirt, Geomorphological Fluid Mechanics, pp.369-393, 2001.
DOI : 10.1007/3-540-45670-8_15

J. D. Courtney, Automatic video indexing via object motion analysis, Pattern Recognition, vol.30, issue.4, pp.607-625, 1997.
DOI : 10.1016/S0031-3203(96)00107-0

C. Ducottet, Application of wavelet transforms to the processing of tomographic and holographic images of fluid flows, 1994.

]. H. Ein41 and . Einstein, Formulas for the transportation of bed load, pp.351-367, 1941.

]. H. Ein50 and . Einstein, The bed-load function for sediment transportation in open channel flows. Technical Bulletin of the United States Department of Agriculture, 1026.

P. Frey, C. Ducottet, and J. Jay, Fluctuations of bed load solid discharge and grain size distribution on steep slopes with image analysis, Experiments in Fluids, vol.35, issue.6, pp.589-597, 2003.
DOI : 10.1007/s00348-003-0707-9

]. R. Flvb76, R. Fernandez-luque, and . Van-beek, Erosion and transport of bed-load sediment, Journal of Hydraulic Research, vol.14, pp.127-144, 1976.

J. [. Frey and . Reboud, Experimental study of narrow free surface turbulent flows at steep slopes Advances in Flow Modeling and Turbulence Measurements, pp.217-224, 2001.

M. [. Graf and . Altinakar, Hydraulique fluviale, Ecoulement permanent uniforme et non uniforme, 1993.

]. G. Gra97 and . Grant, Critical flow constrains flow hydraulics in mobile-bed streams: A new hypothesis, Water Resources Research, vol.33, pp.349-358, 1997.

C. Hu and Y. Hui, Bed-Load Transport.???I: Mechanical Characteristics, Journal of Hydraulic Engineering, vol.122, issue.5, pp.245-254, 1996.
DOI : 10.1061/(ASCE)0733-9429(1996)122:5(245)

C. Hu and Y. Hui, Bed-Load Transport.???II: Stochastic Characteristics, Journal of Hydraulic Engineering, vol.122, issue.5, pp.255-261, 1996.
DOI : 10.1061/(ASCE)0733-9429(1996)122:5(255)

]. V. Hwa89 and . Hwang, Tracking feature points in time-varying images using an opportunistic selection approach, Pattern Recognition, vol.22, pp.247-256, 1989.

H. [. Jenkins and . Hanes, Collisional sheet flows of sediment driven by a turbulent fluid, Journal of Fluid Mechanics, vol.370, pp.29-52, 1998.
DOI : 10.1017/S0022112098001840

]. P. Jul94 and . Julien, Erosion and sedimentation. Press Syndicate of the University of Cambridge REFERENCES [Kou93] V. Koulinski. Etude de la formation d'un lit torrentiel, 1993.

Y. [. Lee, J. Y. Chen, Y. T. You, and . Lin, Investigations of Continuous Bed Load Saltating Process, Journal of Hydraulic Engineering, vol.126, issue.9, pp.691-700, 2000.
DOI : 10.1061/(ASCE)0733-9429(2000)126:9(691)

E. Meyer-peter and R. Müller, Formulas for bed-load transport, In Int. Assoc. Hydraul. Res, vol.2, pp.39-64, 1948.

M. [. Niño and . García, Gravel Saltation: 2. Modeling, Water Resources Research, vol.6, issue.1, pp.1915-1924, 1994.
DOI : 10.1029/94WR00534

Y. Niño, M. García, and L. Ayala, Gravel saltation, 1. experiments, Water Resources Research, vol.30, 1907.

K. Nishino, N. Kosagi, and M. Hirata, Three-Dimensional Particle Tracking Velocimetry Based on Automated Digital Image Processing, Journal of Fluids Engineering, vol.111, issue.4, pp.384-391, 1989.
DOI : 10.1115/1.3243657

P. [. Papanicolaou, N. Diplas, S. Evaggelopoulos, and . Fotopoulos, Stochastic Incipient Motion Criterion for Spheres under Various Bed Packing Conditions, Journal of Hydraulic Engineering, vol.128, issue.4, p.369, 2002.
DOI : 10.1061/(ASCE)0733-9429(2002)128:4(369)

G. [. Parker, L. Seminara, and . Solari, Bed load on arbitrarily sloping beds: Alternative entrainment formulation, Water Resources Research, vol.39, p.1183, 2003.

]. D. Ric91 and . Rickenmann, Hyperconcentrated flow and sediment transport at steep slopes, Journal of Hydraulic Engineering, vol.117, p.1419, 1991.

]. D. Ric97 and . Richard, Transport solide par charriage torrentiel, Des grandsécoulementsgrandsécoulements naturelsànaturels`naturelsà la dynamique du tas de sable ; introduction aux suspensions en géologie et en physique, pp.105-121, 1997.

]. A. Shi36 and . Shields, Anwendung der¨Ahnlichkeitsmechanikder¨ der¨Ahnlichkeitsmechanik und Turbulenzforschung auf die Geschiebebewegung, p.26, 1936.

M. [. Smart and . Jaeggi, Sediment transport on steep slopes, Mitteilungen der Versuchsanstalt für Wasserbau, Hydrologie und Glaziologie, p.64, 1983.

R. [. Sethi and . Jain, Finding Trajectories of Feature Points in a Monocular Image Sequence, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.9, issue.1, pp.56-73, 1987.
DOI : 10.1109/TPAMI.1987.4767872

A. [. Sumer, J. Kozakiewicz, R. Fredsøe, and . Deigaard, Velocity and Concentration Profiles in Sheet-Flow Layer of Movable Bed, Journal of Hydraulic Engineering, vol.122, issue.10, pp.549-558, 1996.
DOI : 10.1061/(ASCE)0733-9429(1996)122:10(549)

J. [. Schmeeckle and . Nelson, Direct numerical simulation of bedload transport using a local, dynamic boundary condition, Sedimentology, vol.105, issue.2, pp.279-301, 2003.
DOI : 10.1063/1.864230

]. P. Soi99 and . Soille, Morphological image analysis, principles and applications, 1999.

I. [. Salari and . Sethi, Feature point correspondence in the presence of occlusion, IEEE Transactions on Pattern Analysis and Machine Intelligence, vol.12, issue.1, pp.87-91, 1990.
DOI : 10.1109/34.41387

G. Seminara, L. Solari, and G. Parker, Bed load on arbitrarily sloping beds: Failure of the Bagnold hypothesis, Water Resources Research, vol.38, p.1249, 2002.

]. L. Van-rijn, Sediment Transport, Part I: Bed Load Transport, Journal of Hydraulic Engineering, vol.110, issue.10, pp.1431-1456, 1984.
DOI : 10.1061/(ASCE)0733-9429(1984)110:10(1431)

Y. [. Wu and . Chou, Rolling and Lifting Probabilities for Sediment Entrainment, Journal of Hydraulic Engineering, vol.129, issue.2, p.110, 2003.
DOI : 10.1061/(ASCE)0733-9429(2003)129:2(110)
URL : http://ntur.lib.ntu.edu.tw//bitstream/246246/139180/1/11.pdf

C. E. Willert and M. Gharib, Digital particle image velocimetry, Experiments in Fluids, vol.10, issue.4, pp.181-193, 1991.
DOI : 10.1007/BF00190388

J. [. Wiberg and . Smith, A theoretical model for saltating grains in water, Journal of Geophysical Research, vol.89, issue.HY3, pp.7341-7354101, 1985.
DOI : 10.1029/JC090iC04p07341