The role of population changes on the temperature changes of the building surfaces and urban open spaces; case study: Tehran metropolis

With the increase of human activities in the city, vegetation and natural cover has always decreased and as a result gives its place to the phenomenon of thermal radiation. The phenomenon of urban heat island (UHI) is usually evaluated by the land surface temperature (LST). The negative effects of LST on urban climate can be manifested by sudden increase in rainfall and unexpected weather effects. Therefore, the stability of population centers will face a serious risk and threat. In addition to climatic factors, population changes and changes due to settlement can also affect the temperature of the city.

In order to achieve the goal of the research, the temperature changes of the city surface between 2012 and 2015 were estimated through Landsat 8 satellite images, and finally, according to the changes and population movements in the 22 districts of Tehran, a spatial-spatial comparative comparison was made between the two. The variable has been measured and evaluated.

The results indicate that there is a direct relationship between demographic changes and thermal changes in 12 municipal areas. In 8 regions, this relationship is inverse and in 2 regions out of 22 regions, no significant relationship was observed between demographic and thermal changes.

In general, it can be seen that there is a significant relationship between population changes and temperature changes in Tehran metropolis. The increase in the temperature of the earth's surface, which means more human exposure to heat, will change the quality of life.