, Durant ma thèse, j'ai eectué un séjour de recherche à l'étranger grâce à l'aide nancière de l'école doctorale STEP'UP. J'ai étudié le ambage de coques cylindrinques, un problème qui m'a ouverte aux instabilités mécaniques

, USA) pendant 3 mois, où j'ai travaillé conjointement avec Emmanuel Virot, chercheur postdoctorant. Je fais ici un court rapport de ce travail

, Stability landscape of a defected can

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, Details of the ume experiment

, Calibration of the sediment feeder

, Laser line projected onto the milk surface

, Laser deviation x laser as a function of the bath or the bed elevation h: Top and side view

. .. , Calibration of the laser scanner with a milk bath, p.56

, Bed-elevation measurement

.. .. Downstream-slope-measurement,

, Maximum ow depth as a function of the sediment discharge, p.61

. .. , Illustration of the RGB (left) and HSV (right) color systems, p.62

, Grain detection in our experimental ume

. .. , Number of detected grains as a function of the uid depth, p.65

, Selection of 15 trajectories of sediment grains

, Cross section and sediment-ux prole

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, Relative error of the sediment-ux measurement as a function of the number of particle crossings

, Flow-induced shear stress

, Comparison of transport-law measurements

.. .. Bedload-diusion,

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. .. , Boltzmann distribution for multiple experiments, p.81

, Boltzmann distribution of sediment transport in our ume experiments

, Laboratory river: experimental setup

, Top view of a laboratory river

, Calibration of the sediment feeder

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, Measurement of the bed cross section

. .. , Bed elevation and sediment-ux prole for dierent runs, p.97

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. .. River, 111 4.2 Numerical resolution of equation (4.15)

, Numerical resolution of equation (4.15)

, Phase portrait of equation (4.15)

. .. , Phase portraits of equation (4.15) with dierent values for s, p.122

, Measure of the slope S and of the friction coecient µ t by tting a river's phase portrait. Blue points: experimental data for run 3 (Tab. 3.1)

, Comparison of two methods to measure the slope of a river, p.126

, Illustration of the method to generate an abacus

, Regime relations for the width and aspect ratio of a river, p.130

.. .. Asymptotic-river,

, Sediment bed perturbed by longitudinal streaks

, Mechanism of the bedload instability

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, Stability map of the bedload instability, p.155

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. .. , Bed cross section and sediment ux of the Urumqi river (China), p.169

, Boltzmann distribution in the Urumqi river

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C. , Buckling prediction by probing a can above the hole, but 5 mm on its left

C. , Local inuence of the hole

. .. , Probing of a non-drilled can around its mid plane

, Estimations du débit d'eau moyen et du débit de sédiments à l'embouchure de diérentes rivières

, Expressions du taux d'érosion, de déposition et de la vitesse moyenne des grains selon le régime d'écoulement

, Experimental parameters for the 5 runs

, Dierent colors and their coordinates in the rgb system. Corresponding hue, p.62

. .. Tracking-parameters,

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