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以斜坡平台上的波浪破碎区为研究对象,基于粒子图像测速技术PIV(Particle Image Velocimetry)研究了波浪在斜坡平台上的传播特性。通过分析破碎区流场、斜坡平台沿程波高分布及涡量场变化情况,探讨了波浪形态演变规律。利用谱分析研究了波浪倍频能量演变。结果显示,使用PIV可以良好地获得不同时段的流场完整瞬时信息。波浪在通过斜坡平台时,波形不对称性明显,波能在平台上剧烈衰减,破碎导致涡结构扩散。
Taking the wavy area on the slope platform as the research object, the wave propagation characteristics on the slope platform are studied based on Particle Image Velocimetry (PIV). By analyzing the flow field in the crushing zone, the wave height distribution along the slope platform and the variation of vorticity field, the evolution of the wave shape is discussed. Spectrum analysis was used to study the evolution of wave frequency energy. The results show that the PIV can be used to obtain the complete instantaneous flow field information at different time periods. As the wave passes through the slope platform, the waveform asymmetry is obvious, the wave energy can decay drastically on the platform and the fragmentation causes the vortex structure to diffuse.