Journal of Korea Water Resources Association (한국수자원학회논문집)

Korea Water Resources Association (한국수자원학회)
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Evaluation of the evaporation estimation approaches based on solar radiation

일사량에 기초한 증발량 산정방법들의 적용성 평가

  • 임창수 (경기대학교 공과대학 토목공학과)
  • Received : 2015.12.01
  • Accepted : 2015.12.29
  • Published : 2016.02.29
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Abstract

In order to examine the applicability, the evaporation estimation approaches based on solar radiation are classified into 3 different model groups (Model groups A, B, and C) in this study. Each group is tested in the 6 study stations (Seoul, Daejeon, Jeonju, Busan, Mokpo, and Jeju). The model parameters of each model group are estimated and verified with measured pan evaporation data. The applicability of verified model groups are compared with results of Penman (1948) combination approach. Nash-Sutcliffe (N-S) efficiency coefficients greater than 0.663 in all study stations indicate satisfactory estimates of evaporation. On the other hand, in the model verification process, N-S efficiency coefficients greater than 0.526 in all study stations indicate also satisfactory estimates of evaporation. However, N-S efficiency coefficients in all study cases except Model groups B and C in Busan are less than those of Penman (1948) combination approach. Therefore, it is concluded in this study that the evaporation estimation approaches based on solar radiation have capability to replace Penman (1948) combination approach for the estimation of evaporation in case that some meteorological data (wind speed, relative humidity) are missing or not measured.

본 연구에서는 일사량에 기초한 증발량 산정방법의 적용성을 검토하기 위해 기존에 연구자들에 의해서 제안된 식들을 3가지 형태의 model group (Model groups A, B, and C)으로 분류하고, 이를 우리나라 6개 지역(서울, 대전, 전주, 부산, 목포, 제주)에 적용하였다. 증발접시 증발량 자료를 이용하여 이들 model group들의 매개변수를 추정하고, 검증하였다. 또한 Penman (1948) 조합식을 적용하여 이들 model group들과 비교하였다. 연구결과에 의하면 모든 지역에서 Nash-Sutcliffe (N-S) 효율지수가 0.663 이상을 보여서 만족스러운 증발량 산정결과를 보였다. 모형 검증과정에서 산정된 N-S 효율지수는 모든 연구지역에서 0.526이상을 보여서 역시 만족스러운 결과를 보였으나, 부산지역에서 적용된 Model groups B와 C를 제외하고는 모두 Penman (1948) 조합식보다 작은 N-S 효율지수를 보였다. 따라서 주요 기상자료 일부(풍속, 상대습도)가 부족하거나 측정되지 않는 경우에 증발량 산정을 위해서 Penman (1948) 조합식을 대체하여 일사량자료에 기초한 증발량 산정 방법이 적용될 수 있을 것으로 사료된다.

Keywords

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