Ces Vagues de l’Apocalypse qui Surgissent de Nulle Part Pour Attaquer

Sympa

Imaginez que vous êtes en mer, et de nulle part, un mur gigantesque d'eau—plus grand qu'un immeuble—se lève pour attaquer. 🌊 Ce sont des vagues scélérates, des géants mystérieux qui semblent défier les règles de l'océan. Elles peuvent apparaître soudainement, même lorsque la mer semble calme, et elles sont si puissantes qu'elles ont coulé des navires sans avertissement. Les scientifiques cherchent encore à comprendre comment elles se forment, mais c'est comme la surprise ultime de la nature ! 🌪️🌊 Ce qui est incroyable, c'est que les vagues scélérates peuvent dépasser 30 mètres de hauteur, les rendant plus grandes que la plupart des histoires que vous entendez sur la mer. Plongez pour découvrir la vérité sur ces monstres des océans ! 🚢  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

00:00Ah, the sea is agitated today. Nothing alarming, but enough to cause some discomfort.

00:08A diffuse anxiety invades you, a kind of foreboding. Something serious seems to be about to happen.

00:14And suddenly, panicked screams resound.

00:17When you turn around, you see a huge wave, much higher than all the others.

00:22Could it be a tsunami?

00:24That's right. When we speak of devastating waves, it is usually tsunamis that immediately come to mind.

00:31However, the one that is about to hit your ship is not one.

00:35It is a stormy wave.

00:37Although tsunamis and stormy waves can both cause disasters,

00:41they differ so much by their origin that by the places where their devastation is exercised.

00:46Imagine now a colossal wave, reaching 18 meters in height, projected on your ship.

00:52It is a miracle that the ship does not sink.

00:55This massive wave, a celerate wave, seems to have materialized suddenly, as if it came from nowhere.

01:02As disturbing, unpredictable and isolated as they may seem,

01:06celerate waves are not as rare as one might think.

01:10To better visualize, take the average height of a room in your house.

01:14The ceiling is probably a little less than 3 meters.

01:16A two-story house usually measures between 6 and 9 meters.

01:20As for the Statue of Liberty, it reaches 34 meters if you measure from the feet to the head.

01:25With these benchmarks, you can get an idea of the dimensions of the celerate waves,

01:30whose highest measurements are 15 to 30 meters.

01:33For a wave to be classified as celerate, it must arise unexpectedly and exceed the surrounding waves in height.

01:40But the exact measurement of this gap remains unresolved.

01:43Some specialists believe that a celerate wave must be at least twice as high as the other major waves nearby,

01:50while others do not share this opinion.

01:53Celerate waves are also distinguished by their steeper slopes compared to classic waves,

01:58which generally adopt the shape of a large swell.

02:02This configuration allows ships to sink such waves, even when they are very high.

02:07A celerate wave, on the other hand, looks like a real water wall.

02:12Because of its steeper slope, it hits the ships with colossal force,

02:17sometimes being able to roll over the building.

02:20Celerate waves remain partly mysterious,

02:23especially because no one has ever filmed their formation or followed their entire life cycle.

02:28We have some photographs of these exceptional waves.

02:31However, for centuries, their existence was based only on legends and stories of sailors who survived such encounters.

02:39Scientists have not yet elucidated the exact mechanism at the origin of celerate waves.

02:44A theory evokes a phenomenon of wave reinforcement.

02:48This occurs when two waves interact and their heights combine.

02:53For example, if a 5-meter wave crosses another 10 meters, let's do the math,

02:58it can give birth to an ephemeral wave reaching 15 meters.

03:02Celerate waves are not limited to the oceans.

03:06On November 10, 1975, on Lake Superior,

03:09a group of three celerate waves, nicknamed the Three Sisters,

03:13could have caused the shipwreck of the SS Edmund Fitzgerald, an American cargo ship sailing on the Great Lakes.

03:19This disaster led to the loss of the ship and all its crew members.

03:24These waves followed each other at an interval too close,

03:27preventing the ship from stabilizing and cutting the water brought by the first before the next hit.

03:33The captain of a ship close to the Fitzgerald reported that his building had been hit by two waves from 9 to 10 meters high.

03:40These waves, presumably followed by a third,

03:43would then have pursued their course towards the Fitzgerald, contributing to its shipwreck.

03:48Let's leave this subject aside and go back to the tsunami.

03:51These natural disasters represent an extreme danger and radically differ from celerate waves.

03:57In most cases, a tsunami is caused by an underwater earthquake.

04:01When it is formed, it usually measures only a few meters in height.

04:05However, as it approaches the coast, it increases in size.

04:09By entering shallow waters, it begins to slow down.

04:13The first wave then hits the coast, its summit moving faster than its base,

04:18which explains its height and its dizzying slope.

04:21The lowest point of the wave hits the earth first,

04:24generating a vacuum effect that sucks water away from the shore, exposing the bay and the seabed.

04:30People able to identify this first sign of a tsunami can still have a chance to save their skin.

04:36A few minutes later, a gigantic water wall falls on the coast, destroying everything in its path.

04:42But it is not a single wave.

04:44A train of waves is formed, composed of multiple successive waves.

04:49The speed of this train does not depend on the distance to the epicenter, but on the depth of the ocean.

04:55At sea, tsunamis can reach the speed of a jet plane.

04:59However, when they enter shallow waters, their progression slows down considerably.

05:05The first wave of a tsunami is usually not the most powerful.

05:09However, many people are unaware of this fact and make the mistake of releasing their vigilance after it passes.

05:15They believe in the remote danger, which exposes them to the following waves,

05:19often much more imposing and destructive, which take them by surprise.

05:23A tsunami can sometimes manifest itself in the form of a torrent of boiling water.

05:27At other times, it causes a sudden retreat of the sea, leaving behind failed fish and overturned boats.

05:34In addition, a slight rise in the sea level can also indicate the imminent arrival of a tsunami.

05:40If the first wave reaches the shore, the second, often larger, can occur after a certain delay.

05:47You can also observe the boiling, turbulent sea water and form strange patterns.

05:53It is another indisputable clue that a tsunami is imminent.

05:56Repeated successive waves can also indicate the approach of a tsunami.

06:01If you notice unusual swells following each other at regular intervals,

06:05it would be wise to quickly head to an elevated area.

06:09Surprisingly, some of the most gigantic tsunamis have been caused by landslides.

06:16A striking example is that of the Lituya Bay, in Alaska,

06:20where a landslide generated a wave of 520 meters high, one of the most impressive ever recorded.

06:26This colossal wave swept across the peninsula, carrying trees, vegetation and sweeping the ground to the bare rock.

06:34Its height was equivalent to more than half that of the Burj Khalifa, the highest structure in the world.

06:40Likewise, when a third of the Hawaiian volcano, East Molokai, collapsed in the Pacific Ocean,

06:46it triggered a tsunami reaching 610 meters, or the height of the Shanghai Tower, one of the highest skyscrapers in the world.

06:54Another strange and potentially dangerous oceanic phenomenon is that of the crossed sea.

06:59It is formed when two distinct wave systems meet at right angles,

07:04which often occurs near peninsulas, or where two seas or oceans meet.

07:09This spectacle may seem impressive, but only from the shore.

07:13It is strongly not advisable to throw yourself into the water to interact with these waves.

07:17The countercurrents that are there can easily drag the most experienced swimmers under the surface.

07:23Square waves have also been responsible for many maritime disasters over time.

07:28In addition, if you see agitated waves, mixed with marine debris and algae, abstain from swimming.

07:34These signs can reveal the presence of a powerful torrent, capable of dragging you ashore.

07:40We now come to a much larger phenomenon, and even on a truly planetary scale.

07:44The Rossby waves. There are two types, oceanic and atmospheric.

07:49But given the theme of the day, let's focus on those related to the oceans.

07:54The Rossby waves, which move slowly, are completely different from surface waves.

07:59They are nothing like the waves that wave on the beaches.

08:03These are gigantic ocean movements, which extend horizontally over hundreds of kilometers across the planet, always to the west.

08:10Their magnitude is such that they can influence global climatic conditions, cause high tides, and even cause floods in certain regions.

08:19Their complex movement depends on their location.

08:22In the Pacific, the waves located near the equator take a few months to a year to cross the ocean.

08:28While those located further away from the equator may take more than 10 years to complete this same journey.

08:34So, when a wave passes, don't forget to give it a little sign.

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