Journal of the Korean earth science society (한국지구과학회지)

The Korean Earth Science Society (한국지구과학회)
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Distribution of Relative Evapotranspiration Availability using Satellite Data in Daegu Metropolitan

위성 자료를 이용한 대구광역시의 상대적 증발산 효율 분포

  • Kim, Hae-Dong (Department of Environmental Conservation, Keimyung University) ;
  • Im, Jin-Wook (Department of Environmental Conservation, Keimyung University) ;
  • Lee, Soon-Hwan (Research institute for Basic Sciences, Pusan National University)
  • 김해동 (계명대학교 환경대학 지구환경보전학과) ;
  • 임진욱 (계명대학교 환경대학 지구환경보전학과) ;
  • 이순환 (부산대학교 기초과학연구원)
  • Published : 2006.12.30
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Abstract

Surface evapotranspiration is one of the most important factors to determine the surface energy budget, and its estimation is strongly related with the accuracy of weather forecasting. Surface evapotranspiration over Daegu Metropolitan was estimated using high resolution LANDSAT TM data. The estimation of surface evapotranspiration is based on the relationship between surface radiative temperature and vegetation index provided by a TM sensor. The distribution of NDVI (Normalized Difference of Vegetation Index) corresponds well with that of land-used in Deagu Metropolitan. The temperature of several part of downtown in Deagu metropolitan is lower in comparison with the averaged radiative temperature. This is caused by the high evapotranspiration from dense vegetation like DooRyu Park in Deagu Metropolitan. But, weak evapotranspiration availability is distinguished over the central part of downtown and the difference of evapotranspiration availability on industrial complexes and residential area is also clear.

잠열과 관련된 지표면 증발산량은 지표 온도를 결정하는 중요한 요인이며, 이를 정확히 산정하는 것은 중규모 순환장 예보의 정확도와 밀접하게 관련된다. 본 연구에서는 고해상도인 LANDSAT 5 TM 자료를 이용하여 대구광역시의 상대 증발산 효율을 추정하였다. 증발산 효율 추정은 복사 온도/식생 지수의 관계식을 이용하였다. 식생 지수는 대구광역시의 실제 토지 이용도와 일치하였다. 도시 지역내의 공원 지역의 경우 낮은 복사 온도를 나타내었다. 이것은 두류공원과 같은 도심내 공원 지역의 고증발산에 기인한 것이다. 그러나 전체적인 도심지는 저증발산이 두드러졌다. 그리고 지표면 구성특징에 의하여 도심지 내 공단 지역과 주거 지역은 상대적인 증발산 분포에서 차이가 나타났다.

Keywords

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