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Suggestion of Simple Method to Estimate Evapotranspiration Using Vegetation and Temperature Information

식생 및 기온정보를 조합한 증발산량 산정을 위한 간편법 제안

  • Shin, Sha-Chul (Dept. of Civil Eng., Andong National University) ;
  • Hwang, Man-Ha (Hydro-system Engineering Center, Korea Institute of Water and Environment, KOWACO) ;
  • Ko, Ick-Hwan (Hydro-system Engineering Center, Korea Institute of Water and Environment, KOWACO) ;
  • Lee, Sang-Jin (Hydro-system Engineering Center, Korea Institute of Water and Environment, KOWACO)
  • 신사철 (안동대학교 토목공학과) ;
  • 황만하 (한국수자원공사 수자원연구원) ;
  • 고익환 (한국수자원공사 수자원연구원 수자원시스템연구소) ;
  • 이상진 (한국수자원공사 수자원연구원)
  • Published : 2006.04.01

Abstract

Many methods have been used to estimate evapotranspiration. However, there is little information about the evapotranspiration from river basins with complicated topographies and variable land use. Remote sensing technique is a probable means to estimate distribution of the evapotranspiration in connection with regional characteristics of vegetation and landuse. The evapotranspiration not only depends on meteorological circumstances but also on the condition of the vegetation. The latter effect can be expressed in terms of NDVI(Normalized Difference Vegetation Index) obtained by NOAA/AVHRR datasets. In this paper, a simple method to estimate evapotranspiration of the Keum river basin is proposed based on NDVI and temperature data.

지금까지 증발산량을 산정하기 위한 여러 가지 방법이 개발되어 왔다. 그러나 지표면에서 발생되는 증발산량을 지배하는 복잡한 지형 특성 및 토지 이용 등을 고려하여 정확한 증발산량을 산정한다는 것은 불가능에 가까운 일이다. 원격탐사 기법은 식생과 토지이용과 같은 지형조건과 관련된 증발산량을 산정하기 위한 하나의 수단으로 효과적으로 이용될 수 있다. 증발산량은 기상특성 뿐만 아니라 식생 조건에 의해 지배된다고 볼 수 있다. 그 중 식생조건은 NOAA/AVHRR 자료를 이용하여 얻을 수 있는 정규화 식생지수(NDVI)를 통하여 정량화할 수 있다. 본 연구에서는 금강유역을 대상으로 증발산량을 산정하기 위하여 NDVI와 기온자료를 조합하는 간편법을 제안하고자 한다.

Keywords

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