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Sustainable Development Green Initiatives: Urban Heat Islands

The Urban Heat Island Effect is a growing concern in the North Central Texas region as temperatures rise and more green space is cleared for development. Urban Heat Islands occur when the temperature in an urban area is several degrees higher than the surrounding rural areas due to human activities and the built environment. As the less developed area around the city cools at night, the temperature in the city remains high. This is because pavement, buildings, rooftops, and other developments absorb heat during the day and releases it when the sun sets. The released heat maintains daytime temperatures at night.

Dallas Skyline
Urban Heat Island Effect
Urban Heat Island Effect diagram



Solutions to Urban heat Islands include:

 Permeable Pavements – Permeable Pavements or Cool Pavements are more reflective and generally absorb less heat than traditional pavement.  They are often interwoven with grass and/or other porous substrate, which limits heat storage during the day time.  

Urban Gardens/Forestry – Trees and other foliage not only provide shade, but transpire which releases water vapor into the air and cools the surrounding area. 

Green Rooftops – Green Rooftops are rooftops with a layer of vegetation designed to prevent the absorption of heat.  Similar to Urban Forestry, Green Rooftops reduce ambient temperatures through shading and evapo-transpiration. 

 

 

 Links and Resources

www.epa.gov/heatisland/mitigation/pavements.htm
www.epa.gov/heatisland/resources/pdf/CoolPavesCompendium.pdf
www.concretethinker.com/solutions/Heat-Island-Reduction.aspx
www.epa.gov/heatisland/resources/pdf/GreenRoofsCompendium.pdf

 

12/6/2011 12/2011 bw

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