Analysis of Temporal and Spatial Characteristics of Enugu Urban Heat Island Using Multiple Techniques
8 Pages Posted: 28 Feb 2011
Date Written: February 25, 2011
The temporal and spatial microclimate variations at several sites in Enugu urban were evaluated using paired measurement programme (PMP) and landsat/ETM satellite imagery. The aim was to determine the spatial extent of urban heat island (UHI) in the city. Temperature correlated to land-use and land-cover within the city. The results indicate that urban climate modifications at day and night were very different. A downtown centered heat island was observed at night in both dry and rainy seasons, while there was a mix of cool and heat islands by day especially during rainy seasons. The daytime variations were strongly correlated to the amount of tree shading. During the night, city climate was highly correlated to sky-view factors and thermal properties in the city. Based on these findings, the study proposed some new design strategies for the downtown core of Enugu and its periphery. They aim at maximizing shading on streets during the day while maintaining a large sky view to facilitate night cooling.
Keywords: micro climate, urban heat island, temporal and spatial, land use
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