泥沙扬动临界条件研究

Critical Condition for Inception of Suspended Sediments

摘要: 研究泥沙交换的临界条件对探讨河床变形机理以及河床演变的模拟计算都具有实际意义.通过考虑近底紊流对泥沙颗粒扬动的影响,导出了泥沙颗粒扬动的临界条件.利用所提出的以扬动概率表示的扬动标准对现有研究成果进行了分析比较.
- 泥沙扬动 /
- 悬移质 /
- 临界条件
Abstract: The bed deformation and sediment transport result from the exchanges among various form of sediment motion.It is significant to take into account interaction among suspended load, bed load and movable bed to explore the mechanism of bed changes and improve modelling methods. Considering the influences of near-bed turbulence on the critical condition of suspending processes of sediment particles, a theoretical criterion is presented according to the concept of probability of suspension. In addition,several previous formulae are thus analysed and reviewed.
- inception of suspension /
- suspended load /
- critical condition

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