Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Estimation of Actual Evapotranspiration and Storage Change for the Bokahcheon Upper-middle Watershed

복하천 중상류 유역의 실제증발산량과 저류변화량 산정

  • Lee, Jeongwoo (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Kim, Nam Won (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Lee, Jeong Eun (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology)
  • 이정우 (한국건설기술연구원 수자원연구실) ;
  • 김남원 (한국건설기술연구원 수자원연구실) ;
  • 이정은 (한국건설기술연구원 수자원연구실)
  • Received : 2014.03.10
  • Accepted : 2014.06.26
  • Published : 2014.07.31
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Abstract

The objectives of this study are to estimate the annual and monthly actual evapotranspiration for the Bokhacheon upper-middle watershed using the data from 1996 to 2012 simulated by SWAT-K model, and to evaluate the effect of storage change on the actual evapotranspiration based on water balance estimates. The simulated results of the annual actual evapotranspiration showed the range from 401 mm to 494 mm and the annual mean of 436 mm, about 31% of the annual mean of precipitation. The average monthly estimates of the actual evapotranspiration showed the range of 10 mm/month in Dec to 84 mm/month in Jul. From the analyses of annual mean storage changes according to data length, it was found out that more than four to five years of data of precipitation and runoff are needed to estimate the watershed based actual evapotranspiration with ignorance of the storage change for this study area. Furthermore, annual and monthly relations between the storage change and the difference of precipitation and runoff were derived which can be effectively used for estimating actual evapotranspiration based on water balance analysis.

본 연구에서는 복하천 중상류 유역에 대해 유역수문모델 SWAT-K를 적용하여 1996년부터 2012년까지의 실제증발산량을 모의하여 연별, 월별 변동 특성을 분석하였으며, 유역물수지법으로 증발산량을 산정할 때 유역의 저류변화량 영향에 대해 고찰하였다. 대상유역의 연도별 실제증발산량은 최소 401mm에서 최대 494mm까지 발생하였고 평균적으로 강수량 대비 약 31%인 436mm 발생하였다. 월단위 실제증발산량은 모의기간동안 평균적으로 12월에 최소값 10mm, 7월에 최대값 84mm 발생한 것으로 분석되었다. 자료기간에 따른 연평균 저류변화량의 크기를 평가한 결과 강수량과 유츨량 자료만을 이용하여 유역물수지법으로 연평균 실제증발산량을 추정하기 위해서는 적어도 약 4~5년의 자료를 이용해야 적절한 것으로 분석되었다. 또한, 연구 대상유역에 대해 저류변화량을 고려하여 유역물수지법으로 연단위, 월단위 실제증발산량을 산정할 수 있도록 강수량에서 유출량을 감한 값과 저류변화량간의 선형의 관계식을 제시하였다.

Keywords

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