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Trees help with the city heat

09.07.2019

Scientists have found that plants, trees and reflective materials can help fight extreme heat in urban areas.

The phenomenon of rising temperatures in areas with many buildings and sidewalks is known as the urban heat island effect. Previous research suggests that urban heat islands are associated with high levels of pollution and poor health, especially for the elderly, young children and low-income people.

Researchers at the University of Portland have found several ways to reduce the feeling of heat in cities. They used computer simulations to determine the air temperatures that may occur in certain areas of the city depending on various factors.

It turned out that the temperature drops if the area has vegetation, green roofs are installed, or materials that reflect heat are used for roofing and asphalt.

Experts have run computer simulations of Portland, but the program could help other cities fight their heat islands. Using this algorithm, the scientists built maps of the city, showing each land plot, its level of pollution, percentage of vegetation cover, and more.

The study also showed that the measures taken by the authorities to change the face of the city increase the heat indicators on the streets. For example, it was found that asphalting areas that previously had many trees could raise temperatures by 14 degrees on a summer day. Neighboring areas will also experience side effects.

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Random news from the Archive

Instant dimming for the welder 03.12.2008

The welding helmet of the American company "3M" does not have to be raised and lowered during operation. Its glass, when the arc is turned on, automatically darkens in 0,1 milliseconds and brightens as soon as the arc goes out.

This is how the polarizing filter on liquid crystals works, which works when it is energized by the microprocessor that controls the mask. Moreover, the system reacts only to pulsating light (and the arc always pulsates during welding), so that it will not be confused by a randomly flashed sunbeam or a beam of a strong lantern. Welding ends - the light filter is clarified, and the welder, without lifting the shield, can again perform preparatory operations.

You can adjust the filter for enlightenment with some delay so that the welder is not blinded by the hot weld.

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