| Title |
Validation of Complementary Relationship Hypothesis for Evapotranspiration in Multipurpose Dam Basins |
| Authors |
김지훈(Kim, Jihoon) ; 강부식(Kang, Boosik) ; 김진겸(Kim, Jin-Gyeom) |
| DOI |
https://doi.org/10.12652/Ksce.2017.37.3.0549 |
| Keywords |
보완관계;증발산;팬 증발량;실제증발산량;잠재증발산량 Complementary relationship;Evapotranspiration;Pan evaporation;Actual evapotranspiration;Potential evapotranspiration |
| Abstract |
The complementary relationship hypothesis for areal evapotranspirations was validated in the regional-scale area of multipurpose dam basins in Korea and the long-term water balances were indirectly identified. Annual actual evapotranspiration ($ET_A$) was assumed the difference between total annual precipitation and total annual inflow and the available moisture was assumed the total precipitation. The seasonally varying pan coefficient (kp) is estimated as the ratio of the $ET_{pan}$ and the evapotranspiration calculated by FAO Penman-Monteith equation ($ET_{PM}$). The complementary relationships using ground observation data of $ET_P$ and $ET_A$ in the multipurpose dam basins follow generally the typical pattern that $ET_P$ and $ET_A$ is complementary and converges to equivalent evapotranspiration ($ET_W$) under the extreme wet environment. However, $ET_A$ of Juam dam was estimated relatively greater than other basins and exceeds even $ET_P$ at certain range with high moisture availability, which can be understood as the results of possible over-estimation of precipitation or under-estimation of dam inflow. It is expected that the use of evapotranspiration complementary relationship for validating hydrological water balances will contribute to controlling uncertainties in estimating dam inflows during flood season in particular. |