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"A device on the mast of a ship analysing the surface of the sea could perhaps give a minute's warning that a rogue wave is developing," said Professor Nail Akhmediev, leader of the research at the Research School of Physics and Engineering.
"Even seconds could be enough to save lives."
Rogue ocean waves develop apparently out of nowhere over the course of about a minute and grow to as much as 40 metres in height before disappearing as quickly as they appeared. Ships unlucky enough to be where rogue waves appear can capsize or be seriously damaged, as happened in the Mediterranean Sea to the Cypriot ship Louis Majesty, which was struck by a rogue wave in 2010 that left two passengers dead and fourteen injured.
The research by Professor Akhmediev and the team at the ANU Research School of Physics and Engineering, Dr Adrian Ankiewich and PhD student Amdad Chowdury, is published in Proceedings of Royal Society A. Professor Akhmediev said that there are about 10 rogue waves in the world's oceans at any moment. "Data from buoys and satellites around the world is already being collected and analysed. Combined with observations of the surrounding ocean from the ship this would give enough information to predict rogue waves," said Professor Akhmediev.
The theory may also explain freak waves that wash away people from beaches, as the rogue waves can sometimes transform into travelling waves known as solitons, that travel through the ocean like mini-tsunamis until they hit the coastline.
Professor Akhmediev's theory also applies to other chaotic phenomena such as light travelling in optical fibres, atoms trapped in a Bose-Einstein condensate and the ionosphere in the upper atmosphere. The rogue wave is a special solution of the non-linear Schrodinger equation which is localised in time and space. The solutions were derived by adding terms to cover dispersion to the non-linear Schrodinger equation, forming the Hirota equations.
(Score: 3, Interesting) by fnj on Sunday August 02 2015, @11:59PM
It's not that simple. A comparatively tiny self-bailing lifeboat is probably "safer" than any size ship in the face of rogue waves. Coast guard boats and ships are also comparatively very small, but prodigiously seaworthy. I wouldn't give a plugged nickel for the chances of a grossly top-heavy container ship, even a gigantic one. And I'm pretty sure even a supercarrier could end up on her beam ends and in a very, very bad way.
In Typhoon Cobra in 1944, several aircraft carriers suffered hangar deck fires due to planes careening around and crashing into bulkheads and each other. One carrier rolled 20 degrees, the edge of the flight deck practically lapping the surface. Battleship Iowa suffered a bent propeller shaft. Heavy cruiser Baltimore required major repairs. Three destroyers went down with a total of 775 men. In another typhoon in 1945, heavy cruiser Pittsburgh had her entire bow ripped clean off and left floating on its own.
And these ships had HOURS to prepare for the lashing.