Urban heat island effect and how we can reduce the Heat Island in the Urban area. Some measurement related to urban Planning.

1. • Department of Architecture, Faculty of Technology and Engineering, Maharaja Sayajirao University of Baroda, Vadodara
MURP –II ,2017
Guided by,
Prof. Neha Serwate
Prepared By,
MIRAL KALOLIYA
1

3. .
What is an Urban Heat Island?

4. • Built Up area
• Road Network
• Less green place
• Roof top material and Color
Factors work to promote a heat island.

5. • The temperature of urban areas can be significantly
higher than that of the surrounding rural areas. This fact is
known as the "Urban Heat Island" effect.
Built Up area

6. • Values of built-up ratio
increase from the edges
towards the central part of
the urban areas.
• Near the geometrical
centre of the city the ratio
of the artificial surface
cover is the highest and the
average distance between
buildings is the shortest.
Built Up area
• The above-mentioned increase depends greatly on the
direction, so there are local irregularities in the built-up
ratio field in the city. In order to demonstrate the change
of the direction-dependent varieties of artificial surface
cover and the mean maximum UHI intensity, is high in high-
rise building .

7. Difference b/w Black and White Materials
• As shown in Fig that if roof material is dark it create higher
heat flow in city.
• Light color roof is create less heat flow in city.
• The principal reason for the nighttime warming is that
buildings block surface heat from radiating into the
relatively cold night sky.

8.  Road Network
• Tar, asphalt, brick and concrete absorb insolation and
release it as heat, rather than reflecting it (without heat)
like soil does.
• In Road the dark pavement(Bitumen pavement) is reflect
only 10% of heat
• cool Pavement (Concrete pavement)is reflect the 40% of
heat
• Design of pavement and green cover in Road also play
major role in Urban Heat Island.

9. • During the day in rural areas, the solar energy absorbed
near the ground evaporates water from the vegetation
and soil(evapotranspiration). Thus, causes evaporative
cooling.
• In cities, where there is less vegetation, the buildings,
streets and sidewalks absorb the majority of solar energy
input. UHIs have been indirectly related to climate
change due to their contribution to the greenhouse
effect, and therefore, to global warming.
 Less water in the soil and environment

10. • The extra heat from urban environments can cause
extreme weather and climatic events such as storms,
hurricanes, and floods. Warmer air can hold more water
and moisture, which results in more precipitation.
• For every 1°F warming, atmospheric water vapor
increases 3-4%. Urban heat islands can cause up to 15°F
of warming, which can increase atmospheric water vapor
by more than 50%!
 Effects of UHI

11. Extreme Weather

12. • Every 1°C increase in air temperature, there is a 5-10%
increase in electricity demand this energy demand need
more fossil fuels and more pollution.
• Heat islands can exacerbate the health risk of heat waves
during the summer, difficulty in breathing in olds , heat
craps, and heatstroke's.
• Impact on ecosystems, the atmosphere, and people.

13. 1. Building green roof/wall
2. Create more city parks
3. Covers roofs and roads with light colored materials
4. Tree Plantation and Preservation
5. Plant Trees For Energy Efficiency
6. Low Impact Development Techniques
 Mitigation

14. • A green roof, or rooftop garden, is a vegetative layer
grown on a rooftop. It provides shade and remove heat
from the air through evapotranspiration, reducing
temperatures of the roof surface and the surrounding air.
conventional rooftop can be up to 50°C warmer.
 Green Roof
Green roof Vs. Conventional

15. Create more city parks Create green wall

16. Reference
• LAND-USE PLANNING AND THE URBAN HEAT ISLAND EFFECT
(Graduate Program in City and Regional Planning THE OHIO
STATE UNIVERSITY)
• Slidshare.com

17. Thank You