Abstract

Due to the rapid growth of urban heat island (UHI) in Bangkok, which is covered by 1,568.7 sq.km and 1.5 mMSL and surrounded by the Gulf of Thailand and Chao Phraya river, has been gradual.ly extended through suburban areas that making ambient air temperature increased about 0.03 °C/y for 56-year period (1957 to 2013). The Bowen ratio found between 3.20 to 3.25 that required to select the green patches 25% to 75 % of the total landscape for enough heat absorbent from urban heat island in Bangkok city that being full of concrete construction and dense population. Landscape design for reduction heat from UHI unit areas should be considered in four orders of magnitude, i.e., landscape macro-designing, green patch localization, cooling housing design and construction, and housing landscape design.

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