Browsing by Author "Robel Kassahun Bogale"

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    Comparative Analysis of Urban Heat Island Effect Before And After Corridor Development from ‘Piassa’ to ‘Megenagna’ Route, Addis Ababa, Ethiopia
    (Addis Ababa University, 2025-06-01) Robel Kassahun Bogale; Aramde Fetene (PhD)
    Urban expansion and urbanization in cities like Addis Ababa are increasing the vulnerability of the areas to urban heat island intensity (UHII) phenomena, with an increasing trend in urban thermal dynamics. This research analyzed the spatial and temporal variations along the route from "Piassa" to "Megenagna" before and after corridor development through field observation, using a combination of remote sensing data, and Landsat 8 imagery by the tools Google Earth Engine, and ArcMap. The results demonstrate that the study area's UHII elevated higher during the research period due to increased land surface temperature (LST), fluctuation in normalized difference builtup index (NDBI), and reduced normalized difference vegetation index (NDVI). The annual average mean LST in 2024, with a value of 32.824670C, shows an increasing trend with a value of 31.2260C from 2015 and 30.844310C from the result in 2020. The NDVI result shows a consistently decreasing trend over time. In 2015, the NDVI was 0.34475; in 2020, it declined to 0.265243; by 2024, it further dropped to 0.199966, indicating a reduction of vegetation cover. The mean annual NDBI in 2015 was -0.03495, which increased to 0.001339 in 2020, which indicates built-up area expansion, but in 2024, the value dropped to -0.02705 due to the demolished residence in the area. From the combined impacts of these results, the most negative UHII annual mean average value was recorded in 2015 with the value of 0.246969, which increased in 2020 to -0.257157 and further increased to -0.273355. These results revealed that surface urban heat island intensity (SUHI) was more concentrated in the ‘urban’ area than in the ‘rural’ area. The findings also reveal a significant inverse relationship between NDVI and LST, highlighting the role of sustainable corridor design and Green infrastructure for mitigating the impact of UHII. Future studies should explore in-depth analysis through adaptive advanced approaches by integrating satellite imagery data with the baseline situation (ground truth) for the accuracy and spatially detailed results to develop an effective mitigation strategy. Key Words: Corridor development, impervious surfaces, street scape, and urban heat island effect