한국수자원학회논문집 (Journal of Korea Water Resources Association)

  • 제44권12호
  • /
  • Pages.915-928
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  • 2011
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  • 2799-8746(pISSN)
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  • 2799-8754(eISSN)
한국수자원학회 (Korea Water Resources Association)
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유역 물수지를 이용한 연 실제증발산 산정에 미치는 수문기후 영향 연구

A Study on the Hydroclimatic Effects on the Estimation of Annual Actual Evapotranspiration Using Watershed Water Balance

  • 임창수 (경기대학교 공과대학 토목공학과) ;
  • 임가희 (경기대학교 공과대학 토목공학과) ;
  • 윤세의 (경기대학교 공과대학 토목공학과)
  • 투고 : 2011.07.26
  • 심사 : 2011.10.17
  • 발행 : 2011.12.31
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초록

본 연구에서는 댐유역의 연 실제증발산량에 영향을 미치는 주요한 수문기후요소를 파악하고 유역으로부터의 연 실제증발산량 산정을 위한 다변량회귀식을 제시하고자 하였다. 이를 위하여 우리나라 5개 댐유역(괴산댐, 섬진강댐, 소양강댐, 안동댐, 합천댐)에서연 물수지분석을실시하여 연실제증발산량을 산정하였고, 수문기후자료를 이용한 다변량회귀식으로부터 산정된 증발산량과 비교 검토함으로서 다변량회귀식의 타당성을 검토하였다. 또한 잠재증발산식들을 이용한 실제증발산량 산정 가능성을 파악하기 위하여 잠재증발산식들(Penman식, FAO P-M식, Makkink식, Preistley-Taylor식, Hargreaves식)로부터 산정된 잠재증발산량과 실제증발산량의 상관성을 검토하였다. 검토 결과 실제증발산량과 잠재증발산량 사이에 상관관계가 적어서 잠재증발산량을 이용한 실제증발산량 산정방법은 적절하지 않은 것으로 나타났다. 기존에 제안된 유역 실제증발산량 산정식들과 비교를 통하여 연 실제증발산량을 산정하는데 있어서 다변량회귀식의 적용성을 확인하였다. 또한 각 댐 유역의 실제증발산량에 영향을 미치는 주요 수문기후요소는 각기 다른 것으로 나타났으나, 공통적으로 강수량이 연 실제증발산량 산정을 위한 주요 기후요소인 것으로 나타났다.

The main purpose of this study is to understand the effects of hydroclimatic factors on annual actual evapotranspiration and to suggest the multiple linear regression (MLR) equations for the estimation of annual actual evapotranspiration from watershed. To accomplish this study purpose, 5 dam watersheds (Goesan dam, Seomjingang dam, Soyanggang dam, Andong dam, Hapcheon dam) were selected as study watersheds and annual actual evapotranspiration was estimated based on annual water balance analysis from each watershed. The estimated annual actual evapotranspiration from water balance analysis was used to evaluate the MLR equations. Furthermore, the possibility of the estimation of actual evapotranspiration using potential evapotranspiration equations (Penman equation, FAO P-M equation, Makkink equation, Preistley-Taylor equation, Hargreaves equation) was evaluated. It has turned out that it is not appropriate to use potential evapotranspiration for the estimation of actual evapotranspiration because the correlation between actual evapotranspiration and potential evapotranspiration is very low. The comparison of MLR equations with current actual evapotranspiration equations indicates that MLR equations can be used for the estimation of annual actual evapotranspiration. Furthermore, it has turned out that the effects of hydroclimatic factors on annual actual evapotranspiration from dam watersheds are different in each watershed; however, for all watersheds in common precipitation has turned out to be the most important climatic factor affecting on the estimation of annual actual evapotranspiration.

키워드

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