Bed-load movement experiments demonstrate that 35 percent of the variability of the distance a bed-load particle will move can be explained by the variability of the bottom velocity in the vicinity of the particle, and that 68 percent of the variability can be explained by the combination of bottom velocity and particle parameters. The experiments also indicate that movement of particles through pools is influenced predominantly by differences in particle parameters, whereas movement through riffles is most influenced by differences in bottom velocity.

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