La Ville De New York Croule Sous Son Propre Poids
La Grosse Pomme joue à s'enfoncer ! Ce n'est pas que NYC ait un désir secret d'être l'A+, mais avec ses bâtiments massifs et ses millions de personnes, elle fait peser une lourde charge sur le socle rocheux. Vous voyez, la ville s'enfonce un peu chaque année en raison du poids de toutes ces structures emblématiques et de l'agitation des foules. C'est comme si la jungle urbaine dansait un slow avec la gravité. Ne vous inquiétez pas, il ne s'agit pas d'une situation de sortie d'urgence, mais plutôt d'un numéro d'équilibriste géologique qui fait partie de l'histoire de la ville en constante évolution. ️
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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:
/ sympasympacom
Instagram:
/ sympa.officiel
Stock de fichiers (photos, vidéos et autres):
https://www.depositphotos.com
https://www.shutterstock.com
https://www.eastnews.ru
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Si tu en veux encore plus, fais un tour ici:
http://sympa-sympa.com
Transcript
00:00 Is the big apple becoming a little too heavy for its own good?
00:05 A recent study revealed that the city of New York was sinking.
00:09 And, hold on, it's because of these skyscrapers.
00:13 Apparently, this is a phenomenon of subsidence,
00:17 which occurs when the surface of the earth gradually erodes or suddenly sinks.
00:23 The moving moss sediments and the weight of the city itself are responsible for this subsidence.
00:31 Well, but don't worry too much.
00:34 The study revealed that New York was sinking at a rate of 1 to 2 mm per year.
00:39 Of course, that doesn't seem like much, but some parts of the city sink much faster than that.
00:44 This subsidence situation could cause problems in the metropolis.
00:49 Especially since it's already quite low and houses more than 8 million inhabitants.
00:54 It is therefore important that local authorities develop strategies to deal with the risk of sinking in the ocean and to elevate the sea level.
01:04 But we're not sure that building giant dikes is the solution.
01:08 Maybe we should be a little more creative.
01:12 Geologists want to make sure that we are all aware that the construction of new skyscrapers near the coasts, rivers or lakes could contribute to the risk of flooding in the future.
01:23 We must therefore think twice before starting to build skyscrapers, right and left.
01:32 In recent studies, scientists have calculated the total mass of all the buildings in New York City,
01:38 more than a million of them, which represents an impressive total of 764 billion tons.
01:44 It's a very large load.
01:47 Of course, they didn't include the weight of the roads, sidewalks, bridges and other paved areas.
01:54 So you can only imagine the additional weight that is added to the city.
01:58 But even with these limits, researchers have managed to take into account the complex geology of the New York subsoil,
02:04 including the deposits of sand, limestone and clay, as well as the good old rock substrate.
02:12 They have discovered that certain types of soil, such as clay and artificial slabs, were more prone to erosion.
02:20 On the other hand, the sea rock remains quite firm and maintains the skyscrapers in place.
02:25 At least, we have no fear that the Empire State Building will sink immediately.
02:31 By comparing their sophisticated model to satellite data,
02:34 researchers have created a map of the city showing the places where the collapse occurs.
02:39 And guess what?
02:40 The growing urbanization and all the pumping and drying of groundwater only aggravate the situation.
02:47 It's high time to start protecting our resources.
02:50 Don't you think?
02:53 I won't pack my bags right now.
02:56 Because New York is not the only city to sink.
03:00 Jakarta, the current capital of Indonesia, is also sinking.
03:06 In fact, some parts of the city could be submerged by 2050.
03:12 It's a bit like a New Atlantis.
03:14 More than 30 million people in Jakarta are deciding whether they should move the entire city.
03:22 If there is a city that we should be worried about sinking, it is Venice.
03:26 But why is it so impatient to sink, you ask?
03:30 Well, let us tell you the truth.
03:32 Venice has decided to expand to a swampy lagoon, with foundations often insufficient.
03:38 Over time, the ground has not held and has compacted like guimauve.
03:42 In addition, the city has pumped its groundwater as if there should be no tomorrow.
03:48 And the icing on the cake is that the sea level is rising slowly.
03:52 And guess what?
03:54 The tectonic face of the plates is pushing the Adriatic plate under the Apennines,
03:59 which gives Venice additional pressure downwards.
04:03 In addition, the city has pumped its groundwater as if there should be no tomorrow.
04:08 And the icing on the cake is that the sea level is rising slowly.
04:13 And guess what?
04:14 The tectonic face of the plates is pushing the Adriatic plate under the Apennines,
04:19 which gives Venice additional pressure downwards.
04:24 Someone had the brilliant idea of stopping the pumping of groundwater,
04:28 thinking thus to put an end to all these stories of sinking.
04:31 But do not worry too much.
04:33 A new study revealed that this sinking had not completely stopped,
04:38 but had simply slowed down.
04:41 It turns out that the whole area is slightly leaning east,
04:45 Venice being perched on the highest part.
04:49 You must be wondering how much Venice is sinking in a year, right?
04:53 Well, prepare for a shock.
04:55 The city is also sinking at a rate of 1 to 2 mm per year, just like New York.
05:00 At this rate, over the next 20 years, it could sink a design of centimeters below sea level
05:07 to avoid this "transformer" in a true Venetian aquarium.
05:11 The inhabitants are constantly trying to stop the specialists to stop the water from sinking into the lagoon.
05:17 But be patient, because this project is more delayed than expected.
05:22 Oh, and did you notice the charming retro atmosphere of Venice?
05:27 It's not just because they're fans of the vintage look.
05:31 The salty waters have wreaked havoc on the buildings,
05:34 because the water levels have constantly put the original waterproofing to the test.
05:39 Now, the water has come closer to the foundations and the ground floors of many houses
05:44 are no longer safe enough to be inhabited.
05:48 Very well, but when will Venice finally sink into the abyss?
05:52 It's hard to say with certainty.
05:54 The subsidence and rise in sea level are as slow and unpredictable as a turtle in the middle of a marathon.
06:01 But some experts have warned that if things continue like this,
06:05 Venice could go under the water by 2100.
06:09 Don't worry, though.
06:11 Local authorities are doing their best to prevent this floating gem of heritage from being turned into a Hollywood disaster film.
06:18 So don't cancel your trip to Venice.
06:22 New Orleans also has a particular situation in terms of water.
06:27 You see, originally, this animated city was built just above sea level.
06:34 But today, it's sinking, little by little.
06:37 At the time when the French Quarter was beginning to develop,
06:40 the inhabitants had to deal with what they had.
06:43 They found the best possible land, but it was only a few ten meters above sea level.
06:49 Let's not forget that the rest of the city is as flat as a pancake,
06:52 the areas around the French Quarter being just a little lower.
06:57 Even if they knew they would have to face some floods,
07:01 the inhabitants of New Orleans, full of resources,
07:04 did their best to build their houses above the floodplains they had chosen as their residence.
07:09 And that's not all.
07:11 The ground of New Orleans is as unstable as a flat plate.
07:15 The architects had to rely on trap constructions,
07:18 because they feared that the ground could not withstand the weight of higher structures.
07:22 They preferred to play the security card by staying on two floors or two and a half floors.
07:28 That's when things got interesting.
07:31 The city installed a sophisticated drainage system in the 1900s,
07:35 thinking it would solve its water problems.
07:37 Although it was useful for swamps, it inadvertently sucked the life out of the ground.
07:43 And yes, it ended up dry,
07:45 devoid of enough water and sediment to keep it stable.
07:49 As a result, these old swamps rushed into the breach,
07:53 as if it had acted as a moving sand contest.
07:56 In the 1930s, the situation worsened.
08:00 A third of the city was at sea level,
08:03 and at the time of Hurricane Katrina, this figure had dropped to about 50%.
08:09 And it didn't stop there.
08:12 The sea level decided to join the party,
08:15 swelling faster than a balloon of baudruche.
08:18 Now, not only is New Orleans sinking,
08:21 but the surrounding area is also, at different degrees, below sea level.
08:27 What can we do about the sinking of cities?
08:31 We could, for example, manage our water consumption a little better.
08:35 We can't keep sucking the groundwater from the earth as if it were nothing.
08:40 We need to find new ways to quench the thirst of our urban centers.
08:45 Think about it.
08:46 We could purify the surface water, or even turn the saltwater into a solution for consumption.
08:53 Of course, we'll need a lot of energy to make it all work.
08:58 And while we're on the subject of urban water management,
09:01 let me tell you about a city in Denmark called Nye.
09:04 Its inhabitants have understood everything.
09:06 They collect rainwater and use it to power their toilets and washing machines.
09:11 How ingenious!
09:13 This is what I call a spark of genius.
09:16 [BLANK_AUDIO]