Cette Vague se Produit une Fois Tous les 1 300 ans et des Scientifiques l’ont Observée

Sympa

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

Transcript

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.

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