Urban Heat Island in Ankara with Travers

Abstract

As Ankara is morphologically situated in a basin, this causes air conditions of poor quality for the city-dwellers, and such adverse conditions are further increased sometimes with the impact of urban heat island (UHI). In this study, mobile measurements were made for 12 months (1 at daytime and 1 at nocturnally) to determine the characteristics of UHI in Ankara, and the results were assessed and analyzed using statistical methods. Based on the assessments, the northern cliff of the city is formed at Yükseltepe intersection and the southern cliff is formed at Turan Güneş Street. There are also two different peaks in Ulus and Kızılay, and the plateau of the urban is between the cliffs and peaks. The plateau of the urban includes a temperature sinks and hills, which is caused by the land use in the urban, heavy traffic and characteristics of urban structure. UHI formed in the urban becomes more apparent in the summer season (in the arid period) and is decreased by 0.2 °C during the day and 0.4 °C at night as the temperatures go far away from the city center. The temperatures drop in the sites where visibility of sky is increased. The elevation is effective in the temperature distribution, this is especially effective in the high pressure conditions.

Keywords

• Urban heat island,Ankara,Travers,Sky view factor,Urban heat island intensity

Mobil Ölçümlerle Ankara Şehir Isı Adası

Abstract

Ankara’nın morfolojik olarak bir çanakta yer alması, şehir sakinleri için kalitesiz hava koşulları yaratmakta, bu olumsuz koşullar bazı dönemlerde şehir ısı adası (ŞIA) etkisiyle daha da artmaktadır. Bu çalışmada, Ankara şehrinde ŞIA’nın özelliklerinin belirlenmesi amacıyla 12 ay boyunca her ay için 1 gece 1 gündüz mobil ölçümler yapılmış, sonuçlar değerlendirilmiş ve istatistiksel yöntemler kullanılarak analiz edilmiştir. Bu değerlendirmelere göre, şehrin kuzey falezi Yükseltepe Kavşağı’nda, güney falezi ise Turan Güneş Caddesi’nde oluşmaktadır. Ulus ve Kızılay’da iki ayrı zirve meydana gelmekte, falez ve zirveler arasında ise şehir platosu yer almaktadır. Şehir platosu içerisinde sıcaklık çukuru ve tepeleri görülmekte, bu durum şehir içi arazi kullanımı ve trafik yoğunluğu ve şehir yapısı özelliklerinden kaynaklanmaktadır. Şehirde oluşan ŞIA, yaz aylarında (kurak dönemde) daha belirginleşmekte, sıcaklıklar şehir merkezinden uzaklaştıkça gündüzleri 0,2 geceleri 0,4 °C azalmaktadır. Gök görüş oranı değerlerinin arttığı sahalarda sıcaklıklar düşmektedir. Sıcaklık dağılışında yükselti de etkili olmakta, bu durum özellikle yüksek basınç koşullarında daha görünür hale gelmektedir.

Keywords

• Şehir ısı adası,Ankara,Mobil ölçüm,Gök görüş oranı,Şehir ısı adası şiddeti

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