In this research, interactions between a solitary wave and two submerged rectangular obstacles with different distances were studied experimentally. The particle image velocimetry (PIV) technique was used to measure the velocity field on the weather and lee sides of the two obstacles. Two submerged rectangular obstacles with 12-cm height and 8-cm length were installed in an open water channel with 7-m length. The velocity fields were obtained with 5 fields of view (FOVs) and then synchronized together. The vortices that formed on the weather and lee sides of the rear and front obstacles were compared to each other. It was found that the vortex on the weather side of the rear obstacle was flatter and smaller than that on the weather side of the front obstacle. Moreover, the weather-side vortex of the front obstacle grew more. After the wave passes over the two obstacles, the vortices on the weather and lee sides of the front obstacle are merged together and form a larger vortex. A higher vorticity at the center of the weather side vortex of the front obstacle was observed. By increasing the distance between the obstacles, the vortex between the obstacles expands more, and the interaction of the flow with the obstacles is more intensive so that more and larger vortices are formed. These vortices depreciate the wave energy. The measurement of the wave height before and after the obstacles showed that the larger the distance between the obstacles, the higher wave energy loss will be.

在这项研究中，实验研究了孤立波和两个不同距离的水下矩形障碍物之间的相互作用。粒子图像测速（PIV）技术用于测量两个障碍物在天气和下风面的速度场。将两个高度为12厘米，长度为8厘米的水下矩形障碍物安装在长度为7米的开放水道中。速度场是通过5个视场（FOV）获得的，然后同步在一起。比较了天气和后障碍物和前障碍物的背风面形成的涡流。发现后障碍物的天气侧的涡流比前障碍物的天气侧的涡流更平坦且更小。此外，前障碍物的天气侧涡流更多。在波经过两个障碍物之后，天气的漩涡和前障碍物的背风融合在一起并形成一个更大的漩涡。在前障碍物的天气侧涡旋的中心观察到较高的涡旋。通过增加障碍物之间的距离，障碍物之间的涡流进一步扩大，并且流与障碍物的相互作用更加强烈，从而形成了越来越大的涡流。这些涡流使波能贬值。障碍物前后波高的测量结果表明，障碍物之间的距离越大，波浪能量损失就越大。在前障碍物的天气侧涡旋的中心观察到较高的涡旋。通过增加障碍物之间的距离，障碍物之间的涡流进一步扩大，并且流与障碍物的相互作用更加强烈，从而形成了越来越大的涡流。这些涡流使波能贬值。障碍物前后波高的测量结果表明，障碍物之间的距离越大，波浪能量损失就越大。在前障碍物的天气侧涡旋的中心观察到较高的涡旋。通过增加障碍物之间的距离，障碍物之间的涡流进一步扩大，并且流与障碍物的相互作用更加强烈，从而形成了越来越大的涡流。这些涡流使波能贬值。障碍物前后波高的测量结果表明，障碍物之间的距离越大，波浪能量损失就越大。