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- W1569429441 abstract "The effects of suspended sediment transport on turbulent geophysical flows have long been debated in the literature. Yet there remains ambiguity in the results and in the interpretation of criteria commonly employed to discriminate the occurrence of turbulence modulation, especially in experimental open-channel flows. To address some of these issues, the effects of suspended sediment on fluid turbulence were investigated using a standard mixing box where a single oscillating grid was placed near the floor of the apparatus. Flow conditions within the box for a given grid oscillation frequency were quantified using particle image velocimetry where fluorescent tracer particles were used to discriminate the fluid phase, and changes to these fluid flow conditions were carefully monitored as concentrations of quartz-density sediment spanning supply-limited to transport-limited suspensions were introduced. The effects of suspended sediment on the magnitude of fluid turbulence in this geophysical flow were clear and significant. As suspended-sediment loadings increased in concentration for a given oscillation frequency, the magnitude of the fluid turbulence within the mixing box decreased markedly and systematically. While both turbulence enhancement and suppression were observed simultaneously in the same flow field, the overall effect of the suspended sediment load was to decrease fluid turbulence, total kinetic energy, and the rate of energy dissipation. It is contended here that the reduction in turbulent kinetic energy in the flow was due to the transfer of this energy to the sediment in suspension. The empirical evidence presented here demonstrated unequivocally that fluid turbulence could be significantly reduced in the presence of suspended sediment, and these observations should be applicable to a wide range of sediment-laden geophysical flows." @default.
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- W1569429441 date "2013-09-06" @default.
- W1569429441 modified "2023-09-25" @default.
- W1569429441 title "Turbulence Modulation by Suspended Sediment in a Zero Mean‐Shear Geophysical Flow" @default.
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- W1569429441 doi "https://doi.org/10.1002/9781118527221.ch20" @default.
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