Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Application of High Resolution Land Use Data on the Possibility to Mitigate Urban Thermal Environment

고해상도 지표자료를 이용한 도시 열환경 완화효과 가능성에 관한 연구

  • Lee, Kwi-Ok (Division of Earth Environment System, Pusan National University) ;
  • Lee, Hyun-Ju (Environmental Cap System Research Department, National Institute of Environmental Research) ;
  • Lee, Hwa-Woon (Division of Earth Environment System, Pusan National University)
  • 이귀옥 (부산대학교 지구환경시스템학부) ;
  • 이현주 (국립환경과학원 환경총량관리연구부 대기총량과) ;
  • 이화운 (부산대학교 지구환경시스템학부)
  • Published : 2009.04.30
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Abstract

In recent years, the urban thermal environment has become worse, such as days on which the temperature goes above $30^{\circ}C$, sultry nights and heat stroke increase, due to the changes in terrestrial cover such as concrete and asphalt and increased anthropogenic heat emission accompanied by artificial structure. The land use type is an important determinant to near-surface air temperature. Due to these reasons we need to understand and improve the urban thermal environment. In this study, the fifth-generation Pennsylvania State University-National Center for Atmospheric Research Mesoscale Model(MMS) was applied to the metropolitan of Daegu area in order to investigate the influence of land cover changes and urban modifications increase of Albedo to the surface energy budget on the simulated near-surface air temperature and wind speed. The single urban category in existing 24-category U.S. Geological survey land cover classification used in MM5 was divided into 6 classes to account for heterogeneity of urban land cover. As a result of the numerical simulation intended for the metropolitan of Daegu assumed the increase of Albedo of roofs, buildings, or roads, the increase of Albedo (Cool scenario)can make decrease radiation effect of surface, so that it caused drops in ambient air temperature from 0.2 to 0.3 on the average during the daylight hours and smaller (or near-zero) decrease during the night. The Sensible heat flux and Wind velocity is decreased. Modeling studies suggest that increased surface albedo in urban area can reduce surface and air temperatures near the ground and affect related meteorological parameters such as winds, surface air temperature and sensible heat flux.

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References

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