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Resource 7 (Causes of heat island effect (Heat produced by human activity:…
Resource 7
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Case study - Cheong Gye Cheon, Seoul Korea - The impact of river restoration on an urban micro-climate.
The heat island phenomenon used to be observed in the Cheong Gye Cheon Stream area under the impact of heavy traffic on an elevated highway, concentrated commercial facilities and the impermeable soil surface over the waterway. The area was showing a temperature about 5 degrees higher than the average temperature of the city.
The project to restore the stream and the areas alongside it has turned the location into a linear green oasis. The water flowing in the stream has decreased the air temperature by up to 10-13 percent, that is 3-4 C during the hottest days, when the temperature goes up to 30 C or higher.
The removal of the elevated highway has allowed wind speeds to increase to up to 7.8 percent faster than before - pushing the temperature down even further. The decrease in the number of vehicles passing by has also contributed to the drop in temperature.
The urban heat Island.
Areas are generally warmer than those of the surrounding countryside; the temperatures are on average 2-4 c higher. This creates an urban heat island
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The reduction in thermal energy required for evaporation and evapotranspiration is due to the surface character, rapid drainage and generally lower wind speeds.
The reduction of heat diffusion is due to changes in airflow patterns as the result of urban surface roughness.
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