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Old Posted Dec 18, 2015, 12:36 AM
Tom Mazanec Tom Mazanec is offline
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Supertalls and weather

Would having several hundred supertalls in one city affect the weather in any way?
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Old Posted Dec 18, 2015, 1:28 AM
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Quote:
Originally Posted by Tom Mazanec View Post
Would having several hundred supertalls in one city affect the weather in any way?
How dense of a city are we talking about?
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Old Posted Dec 18, 2015, 1:29 AM
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Consolidation and increase in wind/heat, so it could and does, but very minor. More local. Not on a wider regional scale. Mountains, now those affect large areas.

Cities with canyons of high rises and skyscrapers have an increase of wind speed due to the wind tunnel effect.
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Old Posted Dec 18, 2015, 2:35 PM
Tom Mazanec Tom Mazanec is offline
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Originally Posted by munchymunch View Post
How dense of a city are we talking about?
Say like Manhattan Island?
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Old Posted Dec 18, 2015, 5:07 PM
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Excluding the effects of smog and pollution from cities, from a purely architectural standpoint, cities have very little impact on the weather, and mostly provide environmental changes at the ground of that city but no futher out.

For example, high rises can easily channel air and create stronger winds. You really notice this in Jersey City for example while it's less of an issue in Manhattan due to the geography of the area (winds blow across the NJ wetlands, and lose most of their strength over the hudson river).

They can also heat the ground due to the reflection of IR energy off low-E glass, and the increased thermal conductance of asphalt and concrete.

The other interesting effect is that while sky scrapers may form wind tunnels near the streets, they also act to block and track higher winds aloft. As a result, when weather such as fog rolls over a city like NY, the saturated air can cling to the buildings and trap the city in a low blanket, while the surrounding areas and rivers, the clouds pass over un-obstructed.
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Old Posted Dec 18, 2015, 5:12 PM
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Quote:
Originally Posted by Tom Mazanec View Post
Would having several hundred supertalls in one city affect the weather in any way?
Dubai is hot because there's lots of supertalls there.

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