The Seasonal Variation of the Urban Heat Island Effect and Estimating the Human - Discomfort Index at the City of Hillah | ||
| Journal of University of Babylon | ||
| Article 1, Volume 24, Issue 2, February 2016, Pages 423-434 | ||
| Authors | ||
| Ali Tuama Mukhelif; Khalid Hassan Al.Ammar; Monim Hakeam Al.Jooburi | ||
| Abstract | ||
| This research focuses on the nature and properties of urban heat island phenomenon such as the seasonal variation, and determining its intensity 〖∆T〗_(u-s) ℃ at the city of Hillah . In terms of environmental impacts it was estimated one of the more important indices that is related to psychological human comfort is the Temperature ــ Humidity Index THI , or as known Human – Discomfort index DI. The area of Hillah’s urban city center is about 165 〖km〗^2 whilst the area of its rural surruoundings is about 56.645 〖km〗^2 .The study reveals that the air temperature difference ∆T between city center and its surrounding is about 1 – 4 ℃ . The specific sites in this study are : the urban site ( u ) represented by the automatic meteorological station of the city of Hillah suburban site ( s ) represented by the automatic meteorological station in department of physics - college of education Babylon university, furthermore approaches of field observing processes over four of different locations were selected within a city center .The meteorological data that have been derived from above stations based on 2013 . In general, it was observed during winter both of ∆T_(u ) and 〖∆T〗_s were elevated at daytime compared to nighttime and reached to greatest value at noontime, and the amount of 〖∆T〗_(u-s) ℃ is ranging around the value 3℃ of average 3.1 ℃ . The 〖∆T〗_(u-s) value was strongest in July during summer season where its average reached 3.4 ℃ . Additionally during spring the values of 〖∆T〗_(u-s) ℃ increased compared to winter season . Also in autumn it was found that values of 〖∆T〗_(u-s) ℃ are slightly less than the values during spring | ||
| Keywords | ||
| urban heat island intensity; local climate; urban canopy layer; urban energy balance | ||
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