TY - JOUR
TI - Influences of population, building, and traffic densities on urban heat island intensity in Chiang Mai City, Thailand
AU - Kammuang-Lue Niti
AU - Sakulchangsatjatai Phrut
AU - Sangnum Pisut
AU - Terdtoon Pradit
JN - Thermal Science
PY - 2015
VL - 19
IS - 12
SP - 445
EP - 455
PT - Article
AB - This research aims to evaluate the Urban Heat Island Intensity (UHII) and  study the influences of population density, building density, and traffic  density on the UHII in Chiang Mai city on each season and time. The  surrounding air temperature was measured by thermocouples at a constant  height of 2 m above the road by mobile surveying approach. The surveyed  routes were divided into urban routes and rural routes. The UHII was  calculated from the average surrounding air temperature difference between  the urban and the rural areas. Experimental investigations were carried out  in two seasons, consisting of summer (March-May, 2014) and winter (December  2013-February 2014). Experimental investigations were carried out in two  periods, which were a daytime period (01.00-03.00 pm) and a nighttime period  (10.00 pm-00.00 am) on Mondays, Wednesdays, and Sundays. The results show  that the UHII in summer day, summer night, winter day, and winter night were  1.07°C, 1.27°C, 0.58°C, and 1.34°C, respectively. This implies that the  temperature in Chiang Mai city’s urban area is higher than that in the rural  area the entire year. Moreover, it was found that the UHII in summer day,  winter day, and winter night were primarily affected by the traffic density  with the sensitivity percentage of 87.50%, 72.73%, and 63.33%, respectively.  In contrast, the UHII in summer night was mainly affected by the building  density with the sensitivity percentage of 50.00%.