Title: The flow induced by a mock whale : origin of flukeprint formation Show Chinese title

Title: 由仿生鲸鱼引起的流动：尾鳍印迹形成的起源

Abstract: Fluke oscillations of cetaceans (whales, dolphins and porpoises) imprint the ocean surface with an oval patch that surface waves cannot enter. Scientists have hypothesized that modification of surface tension by surfactants creates flukeprints. Here, we show, on the contrary, that the formation of flukeprint is primarily due to a wave-current interaction problem. We provide Particle Image Velocimetry measurements of anisotropy and vorticity in the flow generated by a mock whale fluke in a laboratory experiment. We explain for the first time why long gravity waves enter the flukeprint, whereas short gravity waves are blocked. Show Chinese abstract

Abstract: 须鲸类（鲸、海豚和鼠海豚）的尾鳍波动在海洋表面留下一个椭圆形的斑块，表面波无法进入该区域。 科学家曾推测，表面活性剂对表面张力的改变导致了尾鳍痕迹的形成。 在这里，我们相反地表明，尾鳍痕迹的形成主要是由于波流相互作用的问题。 我们在实验室实验中提供了由仿制鲸鱼尾鳍产生的流动中的各向异性和涡度的粒子图像测速测量结果。 我们首次解释了为什么长重力波可以进入尾鳍痕迹，而短重力波却被阻挡。