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Urban Heat Islands
Urban Heat Island : Types
- Mesoscale : Surface Layer, Roughness Sub layer, Canopy layer
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Urban Heat Island : Processes
- Absorption of solar radiation by low reflectance surfaces and trapping by reflections.
- Insulated surfaces lead to high daytime surface temperatures.
- Obstructed view of sky trapping of radiation heat by surfaces.
- Addition of anthropogenic heat, humidity and pollutants.
- Winds Slowed, turbulence increased.
- Impermeable surfaces reduced surface moisture and evaportanspiration.
- Irrigation of select Surfaces.
- Increase of Stored heat by thermal properties of urban materials and increased surface area.
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