第197回白眉セミナー ： 『 Rogue waves in the Laboratory and Nature 』
- チャブチャブ アミン （第11期 防災研究所 特定准教授）
- 2021/05/25 4:30pm
- Zoom（京都大学および白眉センター関係者限定）
- 英語
要旨
Rogue or freak waves are extreme wave events that seemingly appear out of nowhere in calm or rough seas, cause severe damage to ships as well as offshore structures, and then disappear without a trace. Such waves have been reported by mariners for centuries, but it is only a few decades ago that their existence has emerged into light. In fact, on January 1st 1995, a downward-pointing laser sensor installed on the Draupner platform located in the North Sea, measured a remarkable 25.6 m high wave and provided the first scientific proof for the existence of giant waves in the ocean. The mechanisms responsible for the formation of rogue waves from wave dynamics alone, excluding the influence of currents and winds, are the linear interference principle or nonlinear focusing also known as the universal modulation instability (MI). Significant experimental progress has been made over the last decade to investigate the complex forms of MI in water waves and other physical systems, such as optics and plasma. Most-relevant studies conducted in different water wave tanks will be reviewed in the talk while key links to real-world extreme waves will be provided.