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Estimation of Urban Heat Islands Effect and Its Impact on Climate Change: A Remote Sensing and GIS-Based Approach in Rajshahi District

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Document pages: 10 pages

Abstract: In all cities around the world, the urban land surface temperature (LST) is increasing gradually. The dramatic increase in LST leads to climate change, which creates a more extended and serious urban heat island (UHI) effect. In the last few decades, massive land use land cover (LULC) transition leads to higher LST in the city space of Rajshahi City. The dramatic decrease in greenery and water bodies and a significant increase in the urban built-up area influence UHI in Rajshahi city. This study estimates the effect of UHI using quantitative temporal, thermal GIS and remote sensing and techniques. Series of Landsat TM OLI and ASTER images of Rajshahi collected in summer season were used to explore the variation in LST from 1998 to 2018 as well as LULC change. Also, the correlation between LST, NDBI and NDVI for the mentioned date is estimated, and the correlation coefficient is generated. The UHI effect was quantitatively defined using urban thermal field variance index (UTFVI). Results of the study indicate that there are increases in the overall LST between years 1998 and 2018. UHI phenomenon represents that total of 37.36 of the area in the study region estimated higher LST in the space of 20 years. Also, the distribution of UTFVI predominantly related to the expansion of urban built-up area during the study period. The hot spot of lower UTFVI was found in vegetation land where higher UTFVI were mainly found in the built-up areas. These higher hot spot areas are the most vulnerable to UHI effect. The findings will help the concerned authority to prepare a suitable strategy to reduce the UHI effect and improve the climate change scenario of the cities.

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