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Cross-stream diffusion in bedload transport
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DOI：10.1063/1.4861001.png)
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摘要
En 中文
We investigate experimentally the statistical properties of bedload transport induced by a steady, uniform, and laminar flow. We focus chiefly on lateral transport. The analysis is restricted to experiments where the flow-induced shear stress is just above the threshold for sediment transport. We find that, in this regime, the concentration of moving particles is low enough to neglect interactions between themselves. We can therefore represent bedload as a thin layer of independent walkers travelling over the bed surface. In addition to their downstream motion, the particles show significant fluctuations of their cross-stream velocity, likely due to the roughness of the underlying sediment bed. This causes particles to disperse laterally. Based on thousands of individual trajectories, we show that this lateral spreading is the manifestation of a random walk. The experiments are entirely consistent with Fickian diffusion. (C) 2014 AIP Publishing LLC.
Keyword:
SEDIMENT TRANSPORT
LAMINAR FLOWS
BED
MOTION
PARTICLES
EROSION
LIQUID
MODEL
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期刊
IF:
4.3
论文数:
2.9W
被引数:
8.0W
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Selection of the ripple length on a granular bed sheared by a liquid flow.png)
PHYSICS OF FLUIDS
PHYSICS OF FLUIDSIF4.3
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