Comparative Analysis of Heatwave Mitigation Strategies Using UAV and Thermal Infrared Sensors according to Spatial and Temporal Conditions – For the Cool Roof of Case Study Jangyu Mugye-dong –

The purpose of this study is to quantitatively and spatiotemporally analyze the effects of cool roof installations on mitigating urban heat island (UHI) phenomena.By utilizing unmanned aerial vehicle (UAV) and thermal infrared sensor (TIR), the reduction in land surface temperature (LST) due to cool roofs, a key heat mitigation measure, was analyzed across different times of the day.The research was conducted in Jangyu Mugye-dong, Gimhae-si, Gyeongsangnam-do, where cool roofs were implemented as part of a pilot project aimed at mitigating UHI effects.High-resolution thermal images were captured at two-hour intervals from 9 AM to 5 PM on a clear day using UAVs, and the spatiotemporal distribution of LST was analyzed in detail using box plots and z-scores.The results revealed that the cool roof exhibited the most significant temperature reduction effect during the morning hours (9 to 11 AM).The time with the greatest temperature difference, based on the second quartile (Q2), was 11 AM, where the cool roof 's LST was 10.52C lower than that of a conventional roof.Conversely, this difference decreased as the afternoon progressed, reaching the smallest temperature difference of 0.04C at 5 PM.The spatial trends of LST between cool roofs and conventional roofs were analyzed using a box plot and z-score analysis for each period.Additionally, roof objects with extreme LSTs-classified as those with values beyond the absolute range of 1.65-were identified, and the frequency of such objects was determined for each period.The analysis showed that cool roof areas consistently maintained an LST that was on average 5-10C lower than that of conventional roofs.The highest LST observed for conventional roofs peaked at 66.02C at 11 https://www.kjrs.org