An Investigation into the Role of Urban Green Space Vegetation on the Temperature Changes Trend of the Urban Environments Area (Case Study: Sari City)

Subject Areas : Sustainable cities

komeil abdi ¹ ( Department of Geography, College of Human Science, Semnan Branch, Islamic Azad University, Semnan, Iran. )
saeid kamyabi ² ( Associate Professor of Geography Department, Semnan Branch, Islamic Azad University, Semnan, Iran. *(Corresponding Author) )
mohammadreza zandmoghadam ³ ( Assistant Professor, Department of Geography, College of Human Science, Semnan Branch, Islamic Azad University, Semnan, Iran. )

Received: 2018-09-09 Accepted : 2019-02-04 Published : 2021-04-21

Keywords: urban green vegetation, Sari, Land Sat Sensor, heat island,

Abstract :

Background and Objective: One of the new methods to calculate the urban heat island and the role of different usages are the science of remote-sensing and satellite images, which are performed using thermal infrared radiation and applying the physical models to calculate the earth’s surface temperature in large areas. Therefore, we involved in a study in this field in the present research aiming at investigating the heat islands and at comparing the thermal degree and the percentage of green space existing in four areas of Sari city.Method: Radians calculation, reflection coefficient, and images’ radiance temperature in ENVI environment and GIS software processing and analysis were used in order to obtain the heat islands of the city. The used data included the satellite images of TIRS, OLI, and Landsat Sensor 7 and 8 in three time intervals of 2009, 2013, and 2017.Findings: The results of satellite images processing have shown that 45 hectares of urban green vegetation has incurred usage change within 8 years. Also, the earth surface temperature during the statistical period in the minimum and maximum positions during the years 2009 to 2017 has had an increasing trend based on the calculation and this rise in temperature was seen less in areas of the city with more green space.Discussion and Conclusion: the results show that the city’s central region, which is less suitable in terms of vegetation and dispersion of green space in comparison with other regions of the city, is warmer. A proper locating to establish urban green spaces in these areas in the coming years can play a moderating role in the city’s surface temperature.

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