Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Comparison of Evapotranspiration Estimation Approaches Considering Grass Reference Crop

증발산 산정 방법들의 비교 - 잔디기준작물을 중심으로

  • Rim, Chang-Soo (Dept. of Civil and Environmental Engineering, Chungwoon University)
  • 임창수 (청운대학교 철도행정토목학과)
  • Published : 2008.02.29
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Abstract

Five representative reference evapotranspiration(RET) equations were selected, and these equations were compared with pan evaporation by correlation analysis. Pan coefficients were also estimated. Furthermore, five selected RET equations were compared to find the similarity among those at the 21 meteorological stations located in South Korea. Five RET equations selected from 4 different category were Penman(combination approach), FAO Penman-Monteith(FAO P-M) (single source approach), Makkink and Priestley-Taylor (radiation approach) and Hargreaves(temperature approach) equations. In this study, the geographical and topographical conditions were considered for the selection of study stations. The daily meteorological data measured from 1970 at an interval of 5 years were applied in this study. The evapotranspiration estimates obtained by applying evapotranspiration equations were evaluated with numerical and graphical methods. The correlation coefficients between pan evaporation and RET in study stations were above 0.9 indicating very high correlation; however, the slopes of the individual regression lines show the values greater or less than 1.0. Hargreaves equation(temperature approach) shows the most similar evapotranspiration estimates to those of FAO P-M equation from 12 study stations, which are located near to seashore except Daegu station. On the other hand, Priestley-Taylor equation(radiation approach) shows the most similar evapotranspiration estimates to those of FAO P-M equation from 8 study stations, which are located in inland.

본 연구에서는 과거 제안된 5가지의 기준증발산식으로부터 산정된 증발산량과 pan 증발량을 이용하여 상관분석을 실시하였고 pan 계수를 산정하였다. 또한 우리나라 21개 기상관측지점에서 과거 제안된 5가지의 기준증발산식들을 비교하고 그 유사성을 알아보았다. 비교 검토된 기준증발산식은 4가지 방법으로 분류하였으며, 분류된 방법 중에서 각기 대표적인 기준증발산량 산정식을 선정하여 적용하였다. 적용된 기준증발산식은 에너지와 공기동력항의 조합법에 근거한 Penman 식, 단일근원법에 근거한 FAO Penman-Monteith(FAO P-M) 식, 복사자료를 이용한 방법인 Makkink 식과 Priestley-Taylor 식, 그리고 기온자료에 근거한 방법인 Hargreaves 식 등이다. 연구지역 선정을 위하여 기상관측지점이 있는 지역의 지리 및 지형조건을 고려하였다. 사용된 기상자료는 1970년부터 5년 간격으로 8개년의 일별 기상자료를 사용하였다. 적용결과는 수치 및 시계열 도시방법을 통하여 비교하였다. 분석결과에 의하면 대부분의 지역에서 기준증발산식과 pan 증발량과는 0.9 이상의 높은 상관관계를 보이고 있으나, pan 증발량과 비교하여 회귀식의 경사가 1.0보다 크거나 작은 경향을 보이고 있다. 전국 21개 연구지역 중에서 12개 지역에서 대기온도자료에 기초한 Hargreaves 식이 FAO P-M 식과 가장 유사한 것으로 나타났는데, 이들 지역은 대구지역을 제외하고 해안지역에 위치하고 있다. 반면에 내륙에 위치한 8개 지역에서 복사량자료에 기초한 Priestley-Taylor 식이 FAO P-M 식과 유사한 것으로 나타났다.

Keywords

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