Author(s): F. Nunez-Gonzalez; J. P. Martin-Vide
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Abstract: Experiments in a 30m-long tilting flume, with sediment feeding rates as high as 1 kg per second, were performed with sand, gravel and two mixtures of these materials. Mobile-bed equilibrium was sought under near-critical flow regimes to resemble the high sediment transport capacity of torrential ephemeral streams on the Mediterranean area. The flume was equipped with a system to separately measure sand and gravel discharges, so that it was possible to accurately determine the mobility of each size-fraction. The main bed features observed were 3D and 2D downstream migrating antidunes, in coexistence with alternate bars. We present preliminary results for the experimental observations. Bed resistance and grainrelated bed shear stress were computed. A comparison is presented with the MeyerPeter and Muller sediment transport formula, which showed an underestimation trend for the experimental conditions.
Year: 2009