Land cover dynamics and the resulting heat-health nexus in the Kozhikode urban area
Ashique VADAKKUVEETTIL, Central University of Tamil Nadu, India
Aakriti GROVER, Central University of Tamil Nadu, India
In cities, Land Use Land Cover (LULC) patterns are rapidly shifting in an unsustainable manner. Vegetated areas are transformed into concrete masses as cities expand. This increases the Land Surface Temperature (LST) of urban areas. Thus, it is critical to monitor the LULC pattern in cities and analyse its impact on the thermal comfort of people. This study aims to see how changing LULC patterns affect the intensity of LST and its relationship with the Normalized Vegetation Index (NDVI), Normalized Built-up Index (NDBI) and Discomfort Index (DI) in Kozhikode Urban Area, which is the fourth fastest-growing city in the world1,2. A combination of satellite remote sensing, geographic information systems, and statistical analysis is used to investigate all of this. Satellite images of Landsat 5 (TM) and Landsat 8 (OLI & TIRS) of the years 1993 and 2018 were used, respectively. ArcGIS has been used to calculate the LULC pattern, LST, NDVI, NDBI and DI. The supervised technique with maximum likelihood algorithm is used to derive LULC pattern while mono-window algorithm has been used to derive LST. Statistical analyses were done in MS Excel, SPSS and OrginPro. The results reflect a decrease in total vegetated areas from 1993 to 2018, while the built-up area expanded significantly. Paired sample t-test displayed a significant change in LST values during this period. Pearson correlation revealed LST is negatively correlated with NDVI and positively correlated with NDBI. Additionally, it is established that residents in urban areas experience significant temperature discomfort. As a result, this research recommends urban planners and policymakers in Kozhikode to address the excessive change in LULC patterns in the city and implement more sustainable development strategies to mitigate the rising LST and hazardous environmental effects of urbanisation.
Mots clés : Land Use Land Cover Changes|Land Surface Temperature|Urbanization|Thermal Comfort|Urban Health
A104106AV