Avez-vous entendu parler de la vague qui ne se produit qu'une fois tous les 1 300 ans ? Récemment, des scientifiques ont réussi à l'enregistrer, et c'est vraiment stupéfiant ! Cette vague rare, connue sous le nom de mégatsunami, est une énorme muraille d'eau causée par d'immenses glissements de terrain sous-marins ou des éruptions volcaniques. Imaginez la puissance et la taille de quelque chose qui n'apparaît qu'une fois par millénaire et plus. Les données qu'ils ont recueillies pourraient nous aider à mieux comprendre ces phénomènes naturels incroyables et peut-être même à nous y préparer à l'avenir. Animation créée par Sympa.
----------------------------------------------------------------------------------------
Musique par Epidemic Sound https://www.epidemicsound.com
Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna
----------------------------------------------------------------------------------------
Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
----------------------------------------------------------------------------------------
Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
----------------------------------------------------------------------------------------
Musique par Epidemic Sound https://www.epidemicsound.com
Pour ne rien perdre de Sympa, abonnez-vous!: https://goo.gl/6E4Xna
----------------------------------------------------------------------------------------
Nos réseaux sociaux :
Facebook: https://www.facebook.com/sympasympacom/
Instagram: https://www.instagram.com/sympa.officiel/
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
----------------------------------------------------------------------------------------
Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
Category
😹
FunTranscript
00:00In November 2020, a wave of the height of a four-story building,
00:04that is, 18 meters, was observed off the island of Vancouver, Canada.
00:09The Marine Labs team, the company responsible for the buoy taken in this wave,
00:13did not believe their eyes when examining the data.
00:16Everything seemed normal until a colossal force suddenly emerged,
00:20dragging the buoy down before propelling it into the air,
00:23then sucking it back in deeper.
00:25The probability that such a wave forms is once every 1,300 years.
00:29This prompted the team to carefully verify that it was not a technical error.
00:34Marine Labs sent the data to a specialist in accelerated waves from the University of Victoria.
00:39After a thorough analysis, the results were validated and made public in February 2022.
00:45This accelerated wave was officially recognized as the largest ever recorded,
00:49reaching a height three times higher than that of the surrounding waves.
00:53Fortunately, this monster did not cause any damage, because it manifested itself far from the coast.
01:00For centuries, accelerated waves were considered mere marine legends.
01:05Christophe Colomb himself described an accelerated wave,
01:08although this phenomenon was not recognized at the time.
01:11In August 1498, during his third expedition to the Americas,
01:16Colomb crossed a strait near Trinidad when a huge wave lifted his ships.
01:22They held on and continued their journey.
01:24And this region is now known as the Dragon's Mouth,
01:28as Colomb called it.
01:30In 1826, the French explorer and captain Jules Dumont d'Urville
01:35crossed the Indian Ocean aboard his ship, the Astrolabe.
01:38Caught in a terrible storm, he observed several waves exceeding 24 meters in height,
01:44including one reaching that of a ten-story building.
01:47The crew lost a member, but four survivors, including the captain,
01:51managed to reach the mainland and tell their epic.
01:54At that time, the scientists thought that the waves could not reach more than 9 meters,
01:58and this story went down the drain.
02:04Many witnesses have reported stories of giant waves emerging from nowhere.
02:08But scientists have not officially recognized the first accelerated wave until 1995.
02:14Known as the Draupner wave or New Year's wave,
02:17this sea monster hit Draupner's Norwegian gas platform the day after New Year's Eve.
02:22It reached a height of 26 meters, while the surrounding waves were twice as small.
02:28Designed to resist 19-meter waves and equipped with the most advanced sensors of the time,
02:33the platform survived this exceptional wave,
02:36which has become a sensation in the scientific world because of its unique properties.
02:41Following this event, an official definition of accelerated waves was established.
02:46These are waves whose height is more than double that of surrounding waves.
02:51These monsters, almost rivaling tides,
02:54can suddenly emerge in an agitated sea or appear out of nowhere in calm waters.
02:58They are characterized by abrupt flanks and a deep depression below,
03:03resembling a wall of water emerging from the sea.
03:06Their intensity is such that they can even swallow rescue helicopters in the middle of the intervention.
03:13Accelerated waves, however, differ from tsunamis.
03:16They occur when a large displacement of water occurs,
03:20such as during an earthquake, a volcanic eruption or a landslide,
03:25disturbing the entire water column.
03:27At sea, a tsunami can pass unnoticed,
03:30but near the shore, in shallow waters, these waves can reach phenomenal heights.
03:36Accelerated waves, on the other hand, form at the surface of the water,
03:40although some can form in depth and are then called internal accelerated waves.
03:46Scientists and sailors have identified some statistics regarding these waves.
03:51They form more frequently when wave trains meet fast ocean currents.
03:56The South African coast is particularly prone to this phenomenon.
04:00These monstrous waves are feared to become more frequent in the future
04:04due to the increase in energy in the atmosphere and the ocean.
04:07This could lead to larger and more frequent accelerated waves,
04:11as well as more ships lost at sea.
04:17Accelerated waves are not limited to the oceans,
04:20and can also occur in lakes.
04:22The Upper Lake is the scene of a phenomenon called the Three Sisters,
04:26a series of three consecutive large waves.
04:28The second wave submerges the ships' decks before the first one disappears,
04:33and the third adds even more water, overloading the ship.
04:36This theory is advanced to explain the sinking of the steamboat Edmund Fitzgerald in 1975.
04:42Accelerated waves are particularly dangerous because they can create accelerated holes in the water.
04:48When the wave forms, it attracts all the surrounding water,
04:51creating very deep hollows at its base.
04:54If the bow or the stern of a ship finds itself in one of these holes,
04:58the ship can sink instantly.
05:01Some oceanographers believe that accelerated waves could be responsible
05:05for the disappearance of ships in the sadly famous Bermuda Triangle,
05:09which is located in the Atlantic Ocean.
05:11Converging storms from several directions in this mysterious area
05:15increase the probability of formation of accelerated waves.
05:18These waves can reach a height of 30 meters,
05:21and could theoretically sink a plane, in addition to overturning ships.
05:25There are two main theories to explain the formation of accelerated waves.
05:29The first is the theory of linear addition.
05:32It suggests that waves moving at different speeds across the ocean
05:36cross and associate, thus creating an even more powerful accelerated wave.
05:41The second theory is that of non-linear focalization,
05:45which suggests that waves move in groups
05:48and share their energy when they are close to each other.
05:51Sometimes, this exchange of energy would result in the formation of an accelerated wave.
05:57To predict the formation of these monstrous waves,
06:00scientists would need an innovative radar system
06:03to continuously monitor the waves around a ship.
06:06This system would collect all the data
06:08and integrate them into a sophisticated mathematical model,
06:11reproducing in real time the state of the ocean surface.
06:14This model should recalculate the surface situation every 5 minutes
06:18to warn the crew of the approach of possible extreme waves.
06:22Such a system does not yet exist,
06:24but as scientists study the phenomenon of accelerated waves,
06:28mathematicians could develop a way to alert us to their approach.
06:35The term surprise wave is sometimes used as a synonym for accelerated wave,
06:40but oceanographers claim that there is a difference.
06:43Accelerated waves occur mainly at sea,
06:46while non-accelerated waves occur at sea.
06:49Also known as dormant waves or king waves in Australia,
06:53they deflate much faster than the usual waves when they approach the coast.
06:58They always appear without warning after smaller waves
07:02and can be very powerful,
07:04dragging swimmers further into the ocean.
07:06But the worst is that they are able to swallow the walkers of the jetty,
07:10even when they are on a promontory.
07:12Researchers at the National Oceanographic Institute
07:16have discovered that dormant waves form during offshore storms
07:20that transfer wind energy to the ocean surface.
07:23With all this energy, several waves join and overlap
07:27to form a single monstrous wave
07:30that rises higher and progresses further on the shore than an ordinary wave.
07:34Another element that makes dormant waves particularly dangerous
07:38is their unpredictability.
07:40Fishermen, surfers and all people who live in the ocean
07:43generally know when and what to avoid in terms of big waves.
07:47But with these stormy waves, this logic is not short.
07:50There is no specific period of the year when they are most active,
07:54but by collecting some data,
07:56we find that it is more likely to encounter one of these waves between April and October,
08:00with a peak between October and November.
08:03The waves swirl, drift, disperse,
08:07These sea monsters can also move huge trunks of trees,
08:10creating an additional danger.