EFFECT OF EXTERNAL TURBULENCE ON SEDIMENT PICKUP RATE
EFFECT OF EXTERNAL TURBULENCE ON SEDIMENT PICKUP RATE
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DOI：
10.9753/icce.v32.sediment.14
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发表时间：
2011-02
期刊：
影响因子：
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通讯作者：
A. Okayasu;K. Fujii;M. Isobe
中科院分区：
文献类型：
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作者：
A. Okayasu;K. Fujii;M. Isobe
研究了紊动对泥沙挟沙率的影响。在通道中测量了由网格结构产生的外部湍流的拾取速率。结果发现，该速率比非湍流条件下的速率大得多。提出了一个考虑外部湍流影响的Shields参数计算公式。公式中既考虑了紊流作用于泥沙颗粒的惯性力的影响，又考虑了脉动流速引起的拖曳力放大。
Influence of turbulence on sediment pickup rate was investigated. Pickup rates with external turbulence generated by a grid structure were measured in a channel. It was found that the rates were much larger than those for non-turbulent conditions. A new formula in which external turbulence was taken into account for Shields parameter evaluation was proposed. In the formula, effect of inertia force by turbulence acting on sediment particles was included as well as the enlarged drag force caused by fluctuating velocity.