Journal of Environmental Impact Assessment 2023 KCI Impact Factor : 0.51
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pISSN : 1225-7184
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Comparison of Two Methodsto Estimate Urban Sensible Heat Flux by Using Satellite Images
- Journal of Environmental Impact Assessment
- Abbr : J EIA
- 2022, 31(1), pp.63-74
- Publisher : Korean Society Of Environmental Impact Assessment
- Research Area : Engineering > Environmental Engineering
- Received : November 30, 2021
- Accepted : February 13, 2022
- Published : February 28, 2022
Kim Sang Hyuck 1, Lee, Dong Kun 1
1서울대학교
Accredited
ABSTRACT
In orderto understand the urban thermal conditions, many studies have been conducted to estimate the thermal fluxes. Currently sensible heat fluxes are estimated through various methods, but studies about comparing the differences between each method are very insufficient.
Therefore, this study try to estimate the sensible heat flux of the same area by two representative estimation methods and compare their results to confirm the significance and limitation between methods. As a result of the study, the heat balance methods has a great advantage in terms of resolution but it can not consider the anthropogenic heat flux, so sensible heat flux can be underestimated in urban areas. When estimating based on physical equation, anthropogenic heat flux can be considered and the error is relatively small, it has a limitations in time and space resolutons. The two methods showed the largest difference in industiral areas where anthropogenic heat fluxes are high, with an average of 135 W/m2 and a maximum of 400 W/m2. On the other hand, the green and water have a very small difference with and average of 20 W/m2. The results between two methods show significant differences in urban areas, it is necessary to select a suitable method for each research purpose.
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