波浪边界层下的泥沙起动

Criterion for the initiation of sediment movement in different boundary layers under oscillatory waves

首先对波浪作用下泥沙起动研究进行了回顾 ,通过分析 ,认为同样边界层下单向水流泥沙起动标准可以用于波浪条件 ,在此基础上 ,对不同边界层单向水流和波浪作用下起动曲线进行对比论证 ,由此得到波浪作用下泥沙起动标准曲线并给出相应的计算公式 ,大量试验资料表明 ,该曲线与实验值有着良好的一致性。

In regard to the criterion for the initiation of sediment motion due to wave actions, it is widely accepted that the Shields criterion obtained for unidirectional steady flows is applicable as a general criterion for the onset of sediment movement also in oscillatory unsteady flows. In this report, the authors review the findings of those papers at first, and then introduce the concept of boundary layer to analyze the Shields curve for each regime. After that, from a comparison of boundary layers in wave and steady flow conditions, a new criterion curve is presented which can be used to predict the threshold of sediment movement under wave actions. The criterion curve shows good agreement with the experimental data.