The present study investigated experimentally the dynamic interactions between surface waves and submerged vertical tensioned barriers with full and partial penetrations. The range of tension for the barrier was set within the flexible membrane regime in the experiments which measurements have not been reported in the literature so far. In addition, an extensive Internet of Things (IoT) system with five GoPro cameras was developed for the measurements to quantify both the surface wave transformation as well as dynamic response of the barrier. The cameras were synchronized through the IoT system to cover the entire wave flume, and the recorded videos were converted to spatial and temporal data using image processing techniques. The experimental results were found to agree with the analytical predictions based on the linear wave theory reasonably well. In particular, the measured reduction in the tensioning effect on the wave transmission and reflection with decreased barrier length was in close argument with the predictions. Similar good agreement was also observed for the dynamic response of the tensioned barrier during the wave interaction. However, additional energy loss was noted in the experiments possibly due to energy dissipation at the boundary ends of the experimental barrier and wave-induced flow separation with partial penetration which are not considered in the analytical analysis.

中文翻译：

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利用物联网图像处理进行表面波与水下张拉屏障相互作用的实验研究

本研究通过实验研究了表面波与完全和部分穿透的水下垂直张拉屏障之间的动态相互作用。屏障的张力范围在实验中设置在柔性膜范围内，迄今为止文献中尚未报道测量结果。此外，还开发了一个包含五个 GoPro 摄像头的广泛物联网 (IoT) 系统用于测量，以量化障碍物的表面波变换和动态响应。摄像机通过物联网系统同步以覆盖整个波槽，并使用图像处理技术将录制的视频转换为空间和时间数据。实验结果与基于线性波理论的分析预测相当吻合。特别是，随着屏障长度的减小，测量到的对波传输和反射的张紧效应的减小与预测相一致。在波相互作用过程中张拉屏障的动态响应也观察到类似的良好一致性。然而，在实验中注意到额外的能量损失，这可能是由于实验屏障边界端的能量耗散和部分穿透的波浪引起的流动分离，这些在分析分析中没有考虑。