Alternate bar dynamics in response to increases and decreases of sediment supply
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Gravel-bed rivers can accommodate changes in sediment supply by adjusting their bed topography and grain size in both the downstream and cross-stream directions. Under high-supply aggradational conditions, this can result in spatially non-uniform stratigraphic patterns, and the morphodynamic influence of heterogeneous stratigraphy during subsequent degradational periods is poorly understood. We conducted an experiment in an 18.3 m long, 1.2 m wide straight rectangular channel where we developed alternate bars in a gravel-sand mixture under constant discharge and sediment supply then developed ...