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首页> 外文期刊>Ocean Engineering >Scour and burial mechanics of conical frustums on a sandy bed under combined flow conditions
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Scour and burial mechanics of conical frustums on a sandy bed under combined flow conditions

机译：联合流动条件下砂床上锥形截头锥的冲刷和埋藏力学

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摘要

The scour and burial of conical frustums placed on a sandy bed under waves alone (WA) and combined flows (CF) conditions was investigated. The observations indicate that equilibrium burial depth is smaller than burial of other objects such as short cylinders laying on a sand bed under equivalent hydrodynamic conditions. Truncated cone offers less resistance to the flow field due to its more round shape when compared to a horizontally placed short cylinder characterized by sharp edges. A smaller disruption to the flow field translates to less turbulent intensity and to smaller sediment transport capacity of the flow around the object and less burial. The equilibrium burial depth shows a significantly weaker dependency on the Shields parameter than on the Keulegan-Carpenter number, contrary to the case of finite short cylinders. A new empirical predictor based on the relative strength of the wave to the wave plus current velocity, the Keulegan-Carpenter number, and the Shields parameter is proposed for estimating the equilibrium burial of truncated cones under combined flows. Both the Keulegan-Carpenter number and the Shields parameter determine the width of the scour hole around the cone. The former however, is the most dominant parameter influencing the length of the scour hole.
机译：研究了单独在波浪（WA）和联合流动（CF）条件下放置在沙床上的圆锥形截头锥体的冲刷和埋葬。观测结果表明，在等效流体力学条件下，平衡埋藏深度小于其他物体的埋藏，例如，短圆柱体躺在砂床上。与水平放置的具有尖锐边缘的短圆柱相比，截锥由于其更圆的形状而对流场的阻力较小。对流场的较小扰动将转化为较小的湍流强度，并使对象周围的流的泥沙输送能力较小，埋葬较少。与有限短圆柱体的情况相反，平衡埋藏深度显示出对Shields参数的依赖性比对Keulegan-Carpenter数的依赖性弱得多。提出了一种基于波浪相对于波浪的相对强度加上电流速度，Keulegan-Carpenter数和Shields参数的新的经验预测器，用于估计组合流下的截顶锥的平衡埋藏量。 Keulegan-Carpenter数和Shields参数都确定了圆锥周围冲孔的宽度。但是，前者是影响冲孔长度的最主要参数。

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