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首页> 外文期刊>Ocean Engineering >Burial and scour around short cylinder under progressive shoaling waves
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Burial and scour around short cylinder under progressive shoaling waves

机译：在渐进的浅滩波作用下，在短圆柱体周围进行埋葬和冲刷

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摘要

The results of a laboratory experimental program aimed at better understanding the scour around and burial of heavy cylindrical objects under oscillating flow on a sandy bed are described. This study was motivated by its application to the dynamics of isolated cobbles/mines on a sandy floor under nonlinear progressive waves, such as that occur in shallow coastal waters beyond the wave-breaking region. In the experiments, nonlinear progressive waves were generated in a long wave tank of rectangular cross-section with a bottom slope. Model mines (short cylinders) were placed on the sandy bottom and the temporal evolution of the bed profile and the velocity field in the near field of the object were observed. Experiments were conducted at relatively high Reynolds numbers for a range of flow conditions, which can be characterized by the Keulegan-Carpenter number and Shields parameter. Depending on the values of these parameters, four different scour regimes around the cylinder including periodical burial of cylinder under migrating sand ripples were observed; they were classified as: (ⅰ) no scour/burial, (ⅱ) initial scour, (ⅲ) expanded scour, and (ⅳ) periodic burial cases. A scour regime diagram was developed and the demarcation criteria between different regimes were deduced. Semi-empirical formulae that permit estimation of the scour depth with time, the equilibrium maximum scour depth and length, and conditions necessary for the burial of the cylinder as a function of main external parameters are also proposed.
机译：描述了旨在更好地理解在沙床上振荡流动下重圆柱形物体的冲刷和掩埋的实验室实验程序的结果。这项研究的动机是将其应用到非线性渐进波（例如在破波区以外的浅海沿岸水域）下在沙质地面上孤立卵石/矿山的动力学中。在实验中，非线性的渐进波在具有底部斜率的矩形横截面的长波罐中产生。将模型矿井（短圆柱体）放置在沙质底部，并观察床身剖面的时间演变和物体近场的速度场。在一定范围的流动条件下，以相对较高的雷诺数进行了实验，这可以通过Keulegan-Carpenter数和Shields参数来表征。根据这些参数的值，观察到了圆柱周围的四种不同冲刷状态，包括在迁移的沙子波纹下周期性地埋入圆柱；它们被分类为：（ⅰ）无冲刷/埋葬，（ⅱ）初始冲刷，（ⅲ）扩大冲刷，和（ⅳ）定期埋葬案件。绘制了冲刷状态图，并推导出了不同冲刷状态之间的划分标准。还提出了半经验公式，可以估算随时间的冲刷深度，平衡的最大冲刷深度和长度，以及根据主要外部参数埋葬圆柱体所需的条件。

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