URBAN SPRAWL AND CLIMATIC CHANGES IN TEHRAN
*1Gh. R. Roshan, 2S. Zanganeh Shahraki, 3D. Sauri, 4R. Borna 1 Faculty of Geography, University of Tehran, Tehran, Iran Geography and Urban Planning Department, University of Tehran, Tehran, Iran 3 Department of Geography, Universitat Autonoma de Barcelona, Bellaterra, Spain 4 Islamic Azad University, Branch of Ahvaz, Ahvaz, Iran 2
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Received 7 June 2009; revised 10 November 2009; accepted 20 December 2009
Urban sprawl beginning in the developed countries around 1950 is currently experienced in almost all countries.
Many studies on the effects of urban sprawl indicate the emergence of harmful effects of this phenomenon. One of the most important environmental effects is the changes in climate. The purpose of this research was to identify the relation between urban sprawl components of Tehran with changes in climate variables. To this end, two data sets have been used to study the relation between these elements and components. The first data set included climatic elements such as rainfall, temperature, the percent of relative humidity and the percent of calm wind, as well as its mean speed for a period of 54 years (1953-2006). The second set of data was formed by components relevant to urban sprawl such as city area, private cars per capita, population density and number of urban population. Pearson correlation and multiple regression methods have been applied to compare and identify the relation between climatic components with urban sprawl indices. Results of correlation indicate that among the 5 aforementioned climatic components, annual rainfall and the mean of wind speed do not appear to have significant relation with sprawl, but the oscillations in percent of relative humidity and percent of calm wind seem to have a significant relation with Tehran...