Spatio-Temporal Analysis of Urban Heat Island Effect For Different Land Use Land Cover Pattern Over Pune Metropolitan Region,India

The surface temperature of the urban area is usually hotter than the surrounding rural area is known as Urban Heat Island (UHI). It is very important to analyze the spatial distribution of UHI of the cities at various Spatio-temporal scales in order to develop the heat mitigation strategies, air pollution studies, land use planning etc. From the past several studies it is well-known fact that surface energy fluxes control the Land Surface Temperature (LST) which is very sensitive to the land use land cover pattern of the surface. Therefore it is a necessity to analyze the response of UHI to those altering land use land cover patterns. In a current study, we have analyzed the effect of UHI with respect to the different land use land cover patterns over the Pune Metropolitan Region (PMR) at a different seasonal and diurnal scale for the period of 2003 and 2014. In order to retrieve the land use land cover patterns, we have used Landsat datasets while MODIS datasets were used to obtain the seasonal and diurnal variation of LST. Our results of the land use land cover change analysis show that within the span of 2003 to 2014, built-up area has been increased by 160.36 km while the agriculture, forest, and wasteland were decreased by 93.25, 3.59 and 63.62 sq.km respectively. In further part of the study, we have assessed the effect of UHI with respect to land use land cover patterns. The result of this assessment indicates that during the day and night time of the summer season highest magnitude of UHI was observed over the agriculture and wasteland while surprisingly the lowest intensity of UHI was found over the built-up area. On the other hand in the day and night time of the winter season, maximum values of UHI were found over the built-up area in the year of 2003 and 2014. In this period of 2003 and 2014, the overall spatial pattern of the UHI remains the same but its intensity has been changed. The results of this study reveal that it is the necessity to consider a seasonal and diurnal variation of UHI with respect to land use land cover patterns in order to design the mitigation strategies for the effect of UHI