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A method to estimate the forces exerted by internal solitons on cylindrical piles

机译：一种估计内部孤子施加在圆柱桩上的力的方法

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摘要

Internal soliton is the large amplitude wave existing in the pycnocline, induced by internal tide in the condition of special bottom topography. During its propagation process, the induced disturbance can bring about strong convergence of sea water and sudden strong current (wave-induced-current), which can cause severe threat to the ocean engineering structures, such as oil drilling platform and pipeline. In this paper, Morison's empirical method, modal separation and regression analyses are introduced to estimate the forces and torques exerted by internal soliton on cylindrical piles. As an example, a limited set of observational data recording a passage of the internal soliton near Dongsha Islands is used to estimate the horizontal velocity and its acceleration in a vertical section for computing the force and torque on a supposed pile, and the estimation results are reasonable. It is shown that, the higher number of the modes retained in the calculation, the better the estimation of velocity profile fits the observational one. A better overall approximation to the real solution can be reached if there are more observational current data acquired in a whole vertical profile.
机译：内部孤子是在比克诺克林中存在的大振幅波，是在特殊底部地形条件下由内部潮汐引起的。在传播过程中，诱发的扰动会引起海水的强烈汇聚和突然的强流（波感应电流），从而可能对海洋工程结构（如石油钻井平台和管道）造成严重威胁。本文介绍了莫里森的经验方法，模态分离和回归分析，以估计内部孤子施加在圆柱桩上的力和扭矩。例如，有限的一组观测数据记录了东沙群岛附近内部孤子的通过，以估计垂直截面的水平速度及其加速度，以计​​算假定桩上的力和扭矩，估计结果为合理。结果表明，计算中保留的模式数量越多，速度分布的估计值就越适合观测模式。如果在整个垂直剖面中采集到更多的观测电流数据，则可以更好地近似实际解。

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