| Probability of Sediment Incipient Motion Under Complex Flows |
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| 作者姓名： | 刘春嵘 邓丽颖 呼和敖德 |
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| 作者单位： | |
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| 摘 要： | Presented in this paper is a mathematical model to calculate the probability of the sediment incipient motion,in which the effects of the fluctuating pressure and the seepage are considered.The instantaneous bed shear velocity and the pressure gradient on the bed downstream of the backward-facing step flow are obtained according to the PIV measurements.It is found that the instantaneous pressure gradient on the bed obeys normal distribution.The probability of the sediment incipient motion on the bed downstream of the backward-facing step flow is given by the mathematical model.The predicted results agree well with the experiment in the region downstream of the reattachment point while a large discrepancy between the theory and experiment is seen in the region near the reattachment point.The possible reasons for this discrepancy are discussed.
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| 关 键 词： | 起动概率 泥沙起动 复杂流动 数学模型 压力梯度 瞬时速度 PIV测量 脉动压力 |
Probability of Sediment Incipient Motion Under Complex Flows |
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| Institution: | [1]College of Mechanics and Aerospace, Hunan University, Changsha 410082, China [2]Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Presented in this paper is a mathematical model to calculate the probability of the sediment incipient motion, in which the effects of the fluctuating pressure and the seepage are considered. The instantaneous bed shear velocity and the pressure gradient on the bed downstream of the backward-facing step flow are obtained according to the PIV measurements. It is found that the instantaneous pressure gradient on the bed obeys normal distribution. The probability of the sediment incipient motion on the bed downstream of the backward-facing step flow is given by the mathematical model. The predicted results agree well with the experiment in the region downstream of the reattachment point while a large discrepancy between the theory and experiment is seen in the region near the reattachment point. The possible reasons for this discrepancy are discussed. |
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| Keywords: | probability sediment incipience backward-facing step flow seepage pressure |
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