The Unforeseen Issue With Skyscraper Canyons - Cheddar Explores
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- Опубліковано 7 жов 2019
- Have you ever walked down a city street in the winter and almost been blown off your feet by freezing wind? Well, it's the result of man-made street canyons. Towering buildings lining city avenues cause conditions like elevated temperatures, wind vortexes - and conditions that are a lot worse for our health. Cheddar explores why street canyons aren't just an annoyance.
SOURCES:
1: New York Times Archives: www.nytimes.com/1909/02/26/ar...
2: American Thoracic Society: www.thoracic.org/about/newsro...
3: MIT: web.mit.edu/nature/archive/stu... onwind.html
4: Journal of Applied Meteorology and Climatology: journals.ametsoc.org/doi/full...
5: MIT: web.mit.edu/nature/archive/stu...
6: Environmental Health Perspectives: www.ncbi.nlm.nih.gov/pmc/arti...
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On Cheddar.com: chdr.tv/cheddar - Наука та технологія
“Winds reaches 69 miles per hour.”
- nice.
“Winds pushed a little boy under a hearse.”
- …nice.
Gil Sanchez Jr best of both worlds
Well that’s convenient.
Nice.
Hey at least that hearse driver got a job, Think about it 👌
R/cursedcomments
Cheddar makes me interested in stuff I didn’t even know existed
Saucy McRib that’s cause cheddar is cute
Yeah ik Cheddar is a really interesting channel
You didnt know wind tunnel existed? In New York this is obvious, as a former resident and multiple visitor.
Be aware that the content is poorly researched, and there are wildly incorrect facts even in this very short video. It's cool to be exposed to new ideas, all the same; just don't take Cheddar's word for anything.
This is like their least interesting video
Cheddar: Vertical vegetation is very expensive.
Old Castles: Have you heard of Ivy?
Wrigley Field just left the chat.
Many ivy cultivars tend to be damaging to modern building materials.
What does ivy do
@@glocklee_567 It's tendrils seek out tiny (at first) cracks and seams in the material (wood, masonry, siding, stucco, etc) and over time plies them open, causing larger fissures which allows the entrance of water, which will wreak havoc on a structure, even in the short term. They also produce chemicals that can speed this process, depending on the building material. In short: ivy is absolutely gorgeous, but is only ideal for natural landscapes and structures (think stone with no manufactured joints) that require little to no maintenance.
MrOuchiez maybe we need to find a proper material to grow Ivy - like a metal grating in front of glass
Is she kneeling on the floor, or is it a very tall table?
4:02
Her legs are amputated at the knees.
That's offensive, maybe she has no legs and a very tall torso
She's only 7 years old
Too young to do any kneeling
"Blown under a hearse and run over"
*Palpatine voice* Ironic
How's that ironic?
Criminal Saint, oh my! 👀
This isn't irony
@@criminalsaint9611 you gonna pick a side there Italy?
Lmfao. That's fucking funny.
I can’t tell if your 11 or 24
@@jasonquinn2228 go MGTOW...
Jason Quinn Which the 11 or 24 one?
@@ceiling771 19 or 20 where do you get 11?
She belongs in r/15or30
I can't tell if you're**** an English speaker.
Basic aerodynamic facts are wrong. Air moves faster in the wind tunnel where the gap is smaller, not where it gets bigger again.
She also said vortexes instead of vorteces
yeahhh the pressure drops inside the constriction, and the velocity increases, then the opposite occurs when it widens
I was about to say that I was pretty sure that was wrong and that it didn't look right to me (been a while since I've messed with wind tunnels), but I thought I must've remembered incorrectly since there's no way a big youtube channel would mess up such a simple detail when a google search will give you all the info you need and even animations that show it, but no. They got it wrong still lol
I came to the comments just to ensure someone else picked this up and addressed this mistake.
I was puzzled by that mistake too, but then I reflected on my personal experience and it is kind of true. Sometimes you do feel the wind most at exit from the gap. Turns out it does work like that in some cases, look up "vena contracta". Or maybe its some other effect of the turbulence.
Why does this feel like she’s presenting a class project?
@@ryanfoster5902 Nah, it's not the props, it's like the lack of enthusiasm in some parts, as if someone else came up with this video idea and she had to do a book report for it...
She just didn't sound like she actually thought it was fascinating, she sounded like she was pretending to be fascinated. Nothing wrong with that, but I prefer to see videos from people who want to make the video, not from people who make videos because they want views so they can make money...
Great video, just would rather see it made by someone who is actually fascinated by the subject.
She looks young.
Trent Werner, because she looks nine.
Bad actress. Some of the other people I’ve seen in cheddar are more engaging.
@@trentwerner7398 It only seems appropriate. She is not selling anything, so no need to go full Billy Mays.
As always, interesting topic. Details, though. Y'all really wanna do a fact check on:
1. How the venturi effect works, and
2. The plural of 'vortex'.
I was somewhat bothered by #2 as well, but vortexes is a generally accepted plural for vortex in English.
@Star Trek Theory vortices
Thanks! Was scrolling through because of exactly both! Even looking at the Venturi animation without knowledge would raise questions, but it makes no sense that speed increases when the Venturi widens...
Ruben van Rijssen ... unless the flow was choked in the throat and went supersonic in the expansion
Wesley Chapman guess it didn’t go supersonic in NYC streets :’)
My city has the best skyscrapers. Statues and portraits of my family everywhere you go. At least Manhattan’s street canyons create Manhattanhenge
Wasss uuuuppp!!!
My minecraft city skyscraper are far superior to yours 😂
Nothing beats #koreahenge
Naw Chicago
How are you on every video I watch?
Venturi didn't say a liquid speeds up AFTER a constriction. It speeds up IN the constriction, otherwise carburettors, airbrushes and all that other good stuff wouldn't work as nice.
Root3264 Nah
Also the pressure drop does not cause the flow to speed up. Flow continuity is the reason that the velocity increases in the constriction, and the pressure drop is just the result of obeying energy conservation
I mean, close enough for these purposes
Right. Was going to say this. Having the wind speed up only after the narrow means people in the street canyon are unaffected.
@@SWF-lf3pi Yes, he right
1:43 It is the exact opposite. When the opening constricts, flow speeds up and pressure drops
This.
@Star Trek Theory the air going over the top of the wing has to travel a slightly farther distance than the air on the bottom, speeding it up and decreasing air pressure, this means there is more air pressure below the wing than above it, creating lift.
Edit: don't listen to me, apparently this is wrong.
Lift
@@icewink7100 Please don't spread this annoying misconception. The air doesn't give a sh*t about the distance it has to travel. It's all about the Coandă effect and Newton's third law. The pressure difference causes the difference in speed. So it's exactly the opposite.
@@danielgotz4032 huh, I guess you are right. I guess my high school physics teacher was wrong lol.
When life gives you wind tunnels & vortexes, make wind turbines.
Vortices.
If only I can make wind turbine from lemons
Life isn't fair...
Smort
@@jaxomvienonen it's not technically free, as it requires building buildings and turbines, rather it pays for itself.
@@cageybee7221 if it pays itself off its technically free
"Winds reached 69 miles per hour."
Nice.
buckyhermit nice
NICE
Nice
The niceness is supreme.
Nice
I love cheddar so much cause unlike other channels, some of which started but didn't keep going in this way, the content is all informative and well researched (as far as I can tell) and the presentation is also very good :3
Please never stop!
This happens in even smaller cities. In Memphis, Tennessee at the intersection of Third Street and Madison Avenue, the wind is brutal in the winter when a cold front moves in from the west. It is channeled between a 29 story building and a 28 story building. This is about a half mile from the river and about 40-50 feet above the surface of the river due to the river bluff.
I like Cheddar.
It’s like Vox but it’s more relevant to New Yorkers lol.
And less political opinion
@@HaiMalonBodoh Tell me about it, the only time I've ever been racially profiled was on a Vox video where the comments accused me of lying of being a person of color -- and called me a white supremacist -- for disagreeing with them.
The video was about makeup, I dared suggest that the reason make up companies have less skin tones for persons of color was more about economics than racism.
@@RealHipHoManiac you're not wrong but also you have to recognize the economic system is inherently racist and clasist, so in a sense the reason for fewer darker shades is racism
@@nataliaquiroga4015 why? Can you elaborate?
Natalia Quiroga maybe but reeeeeee
That's why us bigfoots just stay deep in the woods where there's no sky scraper canyons
Just Some Bigfoot With Internet Access now for real, are there more people with the same name and profile picture like you or are you just commenting on every video you see
@@spectrent No, he's just commenting on every video *you* see.
Just Some Bigfoot With Internet Access bigfeet*
I think Bigfoot IS blurry, that’s why all those photos look like that- Hedberg.
@@sydkne Bigfoot*
Cheddar: Street Canyons store heat
SF: Where's my himalayan suit?
What do you mean by that I don't live in SF neither US?
@@didid3ksa it's most times really cold and windy in San francisco.
SMM Flo oh I thought south Florida
@@fastcsx1412 if he meant south Florida, then I don't get it either lol
SMM Flo lol
Narrator in 2019: “Or maybe people will stop driving as much.”
Covid-19: “you’re welcome.”
Elon Musk: Why stop driving? Electric cars exist. Problem? Solved.
@@jamielonsdale3018 Yes electric cars help with removing the CO2 and NOx, but there is still some polluting coming from the wheels, like small rubber particles. Bicycles help remove both those problems. ;)
@@jamielonsdale3018 Problem with electric cars right now is charging though. Most apartments don't have anywhere you could plug in a EV in their garages so that's everyone who lives in an apartment off of the list of potential buyers for a long time to come. Then there is the fact that it's only on average a 5 min drive to a gas station with a comparatively instant turn around on fueling, versus the roughly 30 min on average drive to the nearest super charger with a 15 - 30 min wait on getting enough charge to really go anywhere with out needing to charge again before heading home. Then throw in the places that have stretches' of road that are longer than the distance you can travel on a single charge. Until we get more super charging stations we aren't going to see a lot of people interested in getting an EV.
@@astrid.erikssontropp yeah but biking sucks whenever the temp is above 80f or below 60f, or anytime it rains.
This was already mentioned but what’s up with the incorrect explanation of the Venturi effect?
For shits and giggles
I came to the comments because I was pretty sure that's not how that works haha. Pretty basic research failure.
Guys review your Physics for this one.
1. The air doesn't speed up after the narrow section, but during. After it, it returns to the previous speed for the same initial width.
Fyi: It's a divulgative video so this ain't too bad but heat is transferred, not stored.
BUT
2. the reasoning that goes with it IS wrong: metal requires a lot less heat to go up a degree or two than other materials, like wood.
Example: Oak timber requires 5 times as much heat as iron to go up a degree, so applying the same heat to both will increase the temperature of the timber by 1degree, and that of iron by 5 degrees.
3. Finally: CO2 stays at street level? This is contradictory with hot air flowing upward. And the CO2, NO2 produced by vehicles is clearly hotter than street air. I'd rather attribute the excess in pollution at street level to the fact that all that gas originates there so obviously cause it's near the origin there is more pollution.
And you're right sister we gotta use the car less!
Pollution also include particulates though and I'd reckon they're heavier than normal atmosphere.
About your third point: as I remember from school, the winds in the sahara work similarly: the hot air at the bottom does not mix with air that has cooled off far away from the equator.
This aversion to mixing might result in the warmer air staying close to the ground. Not completely sure though
Also. Any reason trees would trap pollution down on street level, because as far as I heard, there was no explanation for why or how given here.
@@naerbo19 trees and leaves would be a physical barrier
I don't like the way you worded the second point or the example, if you apply the same amount of heat to wood and iron they will be the same temperature the only difference is how long it takes for each material to reach that temperature. If you touch a metal bar and a wooden table ,both at room temperature, the metal bar feels colder but it is actually the same temperature, just transfers the heat from your hand faster.
“Or maybe people will start driving less”
Not without a complete overhaul of our zoning laws.
Exactly. It's not really feasible for most people to stop driving in the environment that the US provides them with
Taipei has tons of buildings with vertical plant growth! It's beautiful and really brightens up traditionally dark and drab concrete structures.
Yeah until it catches on fire bc of the plant growth on the side of a building
@@mikegarrett4877 Thats flammable cladding like grenfeld tower in London like so many death traps
Just grab the street canyon, and PUSH it somewhere else!
Just like Beggars Canyon back home!
Nice patrick
Outstanding video Cheddar. Your narration and delivery were expertly done and the topic was very engaging.
0:37 "An 11 year old boy trying to cross the street was blown underneath a Hearse, and run over."
Shit.....well if that ain't symbolic I don't know what is.....
Hey at least that hearse driver got a job, Think about it 👌
@@shadowhaziq4326 Touche! Haha 👌😂
Thanks for taking one for the team, city dwellers. I love it out here in the woods with few neighbors.
I high-key (thats my opposite of low-key since I'm yelling it in the comments) love that Ali was playing with toys at the beginning rather than the typical "youtube computer animation" bits that we all are far too familiar with. (Think round, featureless heads with simple eyes and a mouth that only would pop up when the person walking down the street was "pushed over by winds" accompanied by more simple shapes as body parts).
Yeah! It's refreshing
0:17 “Before we get into this, click subscribe. You’re already here.” Lol nice try
i love the practical effects you use. it's great!
vox, cheddar and the verge all seem to do these. great inspiration as a graphic design student!
Love these types of videos. Honestly so interesting
Really well narrated, intelligently communicated and researched. Well done.
0:32 those wind speeds are pretty nice
no one wants to build anything that will hurt anyone - thank you cheddar for always having that compassion to show us how to avoid mess!
One of the most underrated channels
They're called "vortices", not "vortexes"
Both are correct.
www.merriam-webster.com/dictionary/vortex
Vortexes makes more sense but vortices sounds cooler
@@youdoitillwatch ell.stackexchange.com/questions/134115/plural-of-vortex-vortices-or-vortexes
I think that in professional works, vortices, stadia, referenda are preferable, although vortexes, stadiums and referendums are used in common English (especially the number of referendUMS we seem to be having over here in the UK right now!)
"buildings can be shorter and further apart"
No son that's the whole point of a city
Why do people build tall buildings? To make more room. This video was terrible
I would like to introduce you to european cities.
This is fascinating. Thank you very much for sharing!
Her: “69 miles per hour”
Me, a Midwesterner: that’s supposed to be high winds? Weak.
@@ericolens3 honestly I think it probably has something to do with the high incidence of variable pressure zones and the fact that it's a large, relatively flat terrain trapped between two parallel mountain ranges. Thus, we get influenced by low pressure coming up from the gulf and high pressure coming off the jetstream. When they collide it causes thunderstorms, which is prime weather for tornados, especially when two opposing fronts hit. In Iowa we also get derechos, or straightline wind storms, at around the same rate as Florida gets hit by tropical storms. These storms are classified by sustained winds in excess of 60 miles per hour, but it's not uncommon for us to get sustained winds in excess of 90 miles per hour. Just this year we had gusts in excess of 140 mph, so about equivalent to a cat. 4 hurricane. We also regularly get severe flooding, but luckily that usually doesn't happen at the same time as the storms unless it's been a really bad year.
Every Single Human with more than 0.5 brain cells ay 0:31 :
*NICE*
NOICE
average redditor
less than*
I'm a simple guy. I see a Cheddar video with Ali in it, I click
I’m in engineer in New York City in the force in Rock Center, Bank of America tower, and now the Bloomberg building and New York City does a great job of handling this wind tunnel is that you talk about! Great video!
Just love your videos 👏🏾💯
Winds: 69mph
Me: _Nice_
Yeah copy and paste
Nice
What does this reference to? It seems more than one person feel the need to respond the same way.
Skyscraper Canyon: Traps Heat
Will Smith: Ah that's hot
i was here for the content, excellent. But I stuck to it because of the host, her speech, her gestures and smile, and i’m hypnotised.
I live outside NYC and I always wondered why the city felt so much hotter in summer days when it’s only 40 minutes away...also explained why the air feels so thick since all that smog is stuck at street level. Yikes.
"... people stop driving as much"
Coronavirus: Sounds like a job for me!
I'll subscribe once you start using the metric system
Gotta correct you on the Venturi Effect. As you pass into a constriction, static pressure will drop and airspeed will increase. But when you exit the constriction, static pressure will increase and airspeed will decrease.
I used to ride my Motorbike early morn from out Bush and in winter it would be just above freezing and as soon as you hit Town you could feel the warmer Air instantly, like crossing a barrier and the Homes in the suburbs were single-story detached on blocks with anything above that height at least 10 miles away.
Imagine how beautiful and almost magical cities could look like if stepped vertical vegetation was a common sight.
Is this her 8th grade report?
Rude. Give her due credit. This is more like 10th grade.
@@microbios8586 had me in the first half, not gonna lie
Excellent presentation!!!
I have two great experiences with Wind Canyons. Montevideo, Uruguay 2011. Crazy winds caused the downtown plaza to become crazy. Firefighters had to install wires clamped between buildings for people to hold on while walking. They made a news segment about all the dead umbrellas destroyed by the wind.
Then a few years back in the US, I was biking through a neighborhood that had created a wind canyon with their two story homes. Going through it on my bike I was putting out 210watts and going 8 MPH. As soon as I got through it and the wind went behind me I did 46 MPH with only 50 watts of power.
Great video but as an aerospace person it hurt every time they said "Vortexes"
Vortexes and vorticies are both correct terms in English
Imagine if there were hurricane force winds in Chicago.
This wind problem is completely un-heard of by me! Totally new!
I always like when videos say 'what do you think about this complex issue you just learned about' as if experts in the field are going to be scanning through the comments section looking for ideas.
I kept hearing 'vortexes' and thinking 'vortices.' I looked in my dictionary and both are correct.
Which is why the horde of grammatical hardasses in the comment section need to sit down and shut up.
Hey cheddar, you've earned yourself a subscriber. Great video. I can't wait to watch your future vids :)
Never thought about this. Thank you.
Fell in love with the plug on knowledge.
One thing that a surprising amount of people don't know: Trees actually only absorb CO2 while growing. Think of them as biological carbon storage (in the form of wood). That means that urban trees, that usually are already fully grown trees, absorb almost no CO2 at all.
Don't most trees continue to grow until they die, though? I'm not a botanist.
@@alaskanmooseman5975 yes, but in cities they are prun every year. And that wood liberates the CO2 when it decomposes as well
@@Zore58 interesting. Good point.
Then when you burn wood or it decomposes they release all of their carbon into the environment and the circle of life is complete.
Did anyone else have trouble understanding her say “pollutants”? I kept thinking she was saying “glutens”.
Puebla city was built in 1531. The original layout is slightly off-center of the north south axis to avoid the winds blowing from the north, and minimize wind effects in the street.
Great video!!
0:30 nice
Nice.
@@user-fc9vd6oh6j nice.
Nice.
Nice
Nice
*Phil swift voice* To stop wind vortexes I sawed the Empire state building in half!
The Deadpool. Actually most of the problem canyons are downtown... so he’d have to saw the old Bank of Manhattan Building in half. (Yes, that is the build Trump was talking about on 9/11: “Now have the tallest building downtown”.)
Another problem with the tall vertical buildings next to each other was it would block light. There were streets in Manhattan where it was always dark and gloomy during the day.
Great explanation 👌
Build a ceiling. Easy.
well its kinda too late to move the buildings
Massive surface parking lots, suburban sprawl and low density create way more problems than these minor issues associated with street canyons.
In Santiago, Chile, the city is in a valley, literally a hole, and these 2 problems are extended not in these tunnels but in the whole city. It sucks so much.
Cheddar, Wendover and Half as Interesting. The Holy Trinity of Quarantine Education about stuff I never even thought about.
Where’s my NUMTOTS
The Venturi effect works exactly the other way around.
Thank you. I was about to write that.
We must eat the babies!!!
I was going to comment about that
@@Scorpio-- Yes, I was gonna say that
I love this!!" Really interesting!
awesome eyebrows! great video!
We should take New York City, and push it somewhere else 😌
Like the ocean?
@@bobthebuilder1360 More like bikini bottom :)
@@lBugslBunny maybe bikini bottom is New York in the future
Bob The Builder with how those icecaps are, you’re not all wrong
This was a great narrator/presenter. Have her more often.
If only she knew how to say one of the most technically significant words of her presentation.
Thought is was gonna be open-door-galore, but was actually surprised by this content!
the north -> south design explains my burning hot city! I love east west ones myself - but those are hard to drive/walk on back and forth.
Is it just me or is Ali really the cutest? 😘😘😘
Not just you
@@TykoBrian7 if she consents it's not rape. Or are you just thinking that all Anal sex is rape?
@@unclejimmy5778 ... well, it certainly is gay
Yea
Are we just not going to mention the irony of being run over by a Hearse...
Would love to see a video on vertical vegetation in urban designing
There is an area in my city between two large multi storey buildings . It is called umbrella alley because it is where high wind causes umbrellas to collapse and fail . The people throw the broken umbrellas away right on the spot and that how the place got its name .
Growing vertical vegetation can be very expensive...
Boston Ivy has entered the chat
0:28 really nature it could've been any speed
I live in a large alpine valley--about 25 miles long by 10 miles wide--at the foot of the Western Rockies. The circumference of this valley is almost completely surrounded by mountains; to the west, they rise about 3000-3500 feet from the valley floor, and to the east about 5000-6000 feet above the valley floor, with some peaks going as high as 7000 feet above the valley, for a total altitude of nearly 12000 feet above sea level. Unfortunately, these topographical features regularly create valley-wide inversion, especially in the winter, which traps all the pollutants from a million residents and their vehicles down in the valley. This winter has thankfully been almost inversion free, but there have been years in which inversions have gone on with interruption for weeks, and the sun is filtered through a sickly, weird, brown haze. If you've ever seen a smoggy day in LA, San Bernardino (espescially if you saw it back when pollution was the worst in the 80s or 90s), or Mexico City, you'll know exactly the disgusting sort of air I'm talking about. What makes inversions even worse is that the word is describing a meteorological effect in which cold air is trapped under warm air, so when they occur not only is one stuck in gross, smoggy, brown air, but it's cold and there's perpetual a cold breeze as the trapped air ciruclates around the valley floor. It's miserable, and it kills people with asthma, heart conditions, etc.; and even just a couples weeks of inversion when a woman is pregnant has been shown to significantly increase the chances of birth defects and a low birth weight for her baby. I have a niece who was born prematurely and spent the first three months of her life in NNICU. She was born in March, after a winter that broke local records for the most days with air pollution in excess of EPA standards. I know correlation is not causality, particularly with a process as complex and sensitive as pregnancy, but I'm pretty sure the air pollution wasn't a beneficial influence on my niece's development. Inversions are no joke--they kill people.
Blown under heurse*
Gotta love that speedy response time
This comment is too far down!
hearse pls edit
I like how cheddar has that Vox vibe
Caleb Weldon vox was what we liked about buzzfeed and cheddar is what we liked about vox
@@carsonr1945 omg that wording is perfectttt lmao
69 MPH winds? *Nice*
Good video and animations. And yes, it’s “Vortices”.
I first learned about chedder, on a gas pump, i would actually like more videos for that.
She's the kind of girl that always had textmarkers in pastel and ochre colors back in school
Vortices???
i am a hobbyist developing a cheaper green-wall, i didn't realize it was this useful. i will speed up production. it only works with a few species so far. but very lightweight and relatively cheap.
Venturi effect dictates that as a fluid travels through from a low pressure to a high pressure area the speed will increase. As the air expands, it's velocity will slow down - as in when the street widens.
Try it at home, open one small window and one large window on the other side of the room, the air will enter through the small and exit the large