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Acquisition of the tide-induced Lagrangian residual current field by the PIV technique in the laboratory

机译：在实验室中通过PIV技术获取潮汐引起的拉格朗日剩余电流场

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摘要

In this paper, a new particle image velocimetry (PIV)-based measurement method is proposed to obtain the high-resolution tide-induced Lagrangian residual current field in the laboratory. A long gravity wave was generated to simulate the tide in a narrow tank full of water laden with PIV particles. Consecutive charge-coupled device (CCD) images were recorded with the studied layer illuminated with a laser beam. Two images separated by one tidal period were processed by applying the pattern-matching algorithm to get the horizontal tide-induced Lagrangian residual current field. The results coincide with sporadic results from the traditional surface-float tracing method, but with much higher spatial resolution and accuracy. Furthermore, it is found that the direct acquisition of the Lagrangian residual current may reduce the error at least by one order compared with those acquisition methods that require the detailed information of the tidal cycle.
机译：本文提出了一种新的基于粒子图像测速（PIV）的测量方法，以在实验室中获得高分辨率的潮汐感应拉格朗日剩余电流场。产生了一个长重力波来模拟装满载有PIV颗粒的狭窄水箱中的潮汐。连续电荷耦合器件（CCD）图像被记录，被研究层被激光束照射。应用模式匹配算法对两个潮汐分离的图像进行处理，得到水平潮汐引起的拉格朗日剩余电流场。该结果与传统的表面浮点跟踪方法的零星结果一致，但具有更高的空间分辨率和精度。此外，发现与需要潮汐周期的详细信息的那些采集方法相比，直接采集拉格朗日剩余电流可以将误差至少减小一个数量级。

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