Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Assessment of Complementary Relationship Evapotranspiration Models for the Bokahcheon Upper-middle Watershed

보완관계법에 의한 증발산량 산정 모형의 평가 - 복하천 중상류 유역을 중심으로 -

  • Kim, Nam Won (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology) ;
  • Lee, Jeongwoo (Water Resources Research Division, Water Resources & Environment Research Department, Korea Institute of Construction Technology)
  • 김남원 (한국건설기술연구원 수자원연구실) ;
  • 이정우 (한국건설기술연구원 수자원연구실)
  • Received : 2014.03.05
  • Accepted : 2014.05.13
  • Published : 2014.06.30
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Abstract

The objective of this study is to evaluate the performance of the complementary relationship-based evapotranspiration models, namely, advection-aridity (AA) model of Brutsaert and Stricker and the CRAE model of Morton for estimating actual evapotranspiration. Both models were applied to the Bokhacheon middle-upper watershed, and their estimates were evaluated against the water balance estimate. The calculation was made on a daily basis and comparison was made on monthly and annual bases. For comparison, the water balance estimates were not obtained from the observed precipitation and streamflow data but were based on the simulated data by using integrated watershed model, SWAT-K which is the revised version of SWAT. The reason not to directly use the observed data for water balance estimate is that the credible record period is not sufficient and the streamflow has been altered due to water use and release. Overall, the results showed that both AA model and CRAE model with their original parameters overestimate annual and monthly evapotranspiration, and the large difference between the complementary relationship-based approach and the water balance approach occurs especially for the dry season from Nov. to Mar. It was found out that the parameters, particularly for the advection related parameter, must be recalibrated to accurately produce monthly and annual regional evapotranspiration for this study area.

본 연구에서는 잠재증발산량과 실제증발산량 간의 보완관계식을 이용한 대표적인 증발산량 산정모형인 Brutsaert and Stricker (1979)의 AA 모형과 Morton (1983)의 CRAE 모형의 적용성을 평가하였다. 이를 위해서 두 모형을 복하천 중상류 유역에 적용하여 유역평균 실제증발산량을 산정하고, 유역 물수지 결과와의 비교를 수행하였다. 연구 대상유역은 양질의 하천유량 자료 확보 기간이 짧고, 하천유량 자료 또한 인위적 물이용, 배출로 인해 교란되었기에 강수량, 유출량 등의 관측치 기반의 유역 물수지 결과 보다는 검보정이 잘된 유역수문모형 SWAT-K로 모의한 실제증발산량과의 비교를 통하여 AA 모형과 CRAE 모형으로 산정한 실제증발산량의 적정성을 평가하였다. AA 모형과 CRAE 모형의 의한 실제증발산량 모두 식생성장기에 과다하게 산정되는 경향을 나타내었고, 특히 AA 모형은 건조기간동안 실제증발산량이 과소하게 산정되었다. AA 모형과 CRAE 모형의 정도를 높이기 위해서 매개변수 보정을 수행한 결과, AA 모형의 경우는 건조기간 동안의 적합성을 높이기 위해서 이류항을 추가로 고려하고 Brutsaert and Stricker (1979)의 제안 값 ${\alpha}=1.26$ 보다는 작은 ${\alpha}=1.08$을 사용하였을 때, 그리고 CRAE 모형의 경우에는 Morton(1983)이 제안한 값 $b_1=14Wm^{-2}$, $b_2=1.12$ 보다는 각각 다소 크고 작은 값인$b_1=16Wm^{-2}$, $b_2=1.04$를 사용하였을 때에 연단위, 월단위, 그리고 월별 모두 가장 양호한 실제증발산량 값이 산정되었다.

Keywords

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