Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Estimation of spatial evapotranspiration using Terra MODIS satellite image and SEBAL model in mixed forest and rice paddy area

SEBAL 모형과 Terra MODIS 영상을 이용한 혼효림, 논 지역에서의 공간증발산량 산정 연구

  • Lee, Yong Gwan (Dept. of Civil and Environmental System Engineering, Konkuk University) ;
  • Jung, Chung Gil (Dept. of Civil and Environmental System Engineering, Konkuk University) ;
  • Ahn, So Ra (Dept. of Civil and Environmental System Engineering, Konkuk University) ;
  • Kim, Seong Joon (Dept. of Civil and Environmental System Engineering, Konkuk University)
  • 이용관 (건국대학교 사회환경시스템공학과) ;
  • 정충길 (건국대학교 사회환경시스템공학과) ;
  • 안소라 (건국대학교 사회환경시스템공학과) ;
  • 김성준 (건국대학교 사회환경시스템공학과)
  • Received : 2015.07.22
  • Accepted : 2016.01.27
  • Published : 2016.03.31
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Abstract

This study is to estimate Surface Energy Balance Algorithm for Land (SEBAL) daily spatial evapotranspiration (ET) comparing with eddy covariance flux tower ET in Seolmacheon mixed forest (SMK) and Cheongmicheon rice paddy (CFK). The SEBAL input data of Albedo, Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI) from Terra MODIS products and the meteorological data of wind speed, and solar radiation were prepared for 2 years (2012-2013). For the annual average flux tower ET of 302.8 mm in SMK and 482.0 mm in CFK, the SEBAL ETs were 183.3 mm and 371.5 mm respectively. The determination coefficients ($R^2$) of SEBAL ET versus flux tower ET for total periods were 0.54 in SMK and 0.79 in CFK respectively. The main reason of SEBAL ET underestimation for both sites was from the determination of hot pixel and cold pixel of the day and affected to the overestimation of sensible heat flux.

본 연구는 Surface Energy Balance Algorithm for Land (SEBAL) 모형을 이용해 국내의 혼효림(설마천)과 논(청미천) 유역에 대해 일 증발산량을 산정하고 각 유역의 플럭스 타워 실측 증발산량과 비교하였다. SEBAL 모형의 입력 자료로 위성자료는 2개년(2012-2013)의 Terra MODIS product 중 Albedo, Land Surface Temperature (LST), Normalized Difference Vegetation Index (NDVI)를 활용하였으며, 기상자료는 유역 인근에 위치한 기상청 기상관측소로부터 풍속, 일사량 자료를 제공받아 공간 내삽(Interpolation)하여 활용하였다. 모의결과 플럭스 타워의 연평균 증발산량은 설마천에서 302.8 mm, 청미천에서 482.0 mm, SEBAL 모의 증발산량은 각각 183.3 mm, 371.5 mm로 산정되었다. 전체 모의기간에 대한 SEBAL 모의 증발산량의 실측 증발산량과의 결정계수는 설마천 플럭스 타워에서 0.54, 청미천 플럭스 타워에서 0.79로 나타났다. 두지점에서 SEBAL 모의 증발산량이 과소 추정된 주된 이유로는 일별 hot pixel과 cold pixel로부터 산정한 현열 플럭스의 과대추정으로 인한 것으로 판단된다.

Keywords

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