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Assessment of Actual Evapotranspiration in the Hancheon Watershed, Jeju Island

제주 한천유역의 실제 증발산량 평가

  • Kim, Nam Won (Water Resources Research Division, Korea Institute of Construction Technology) ;
  • Lee, Jeong Eun (Water Resources Research Division, Korea Institute of Construction Technology)
  • 김남원 (한국건설기술연구원 수자원연구실) ;
  • 이정은 (한국건설기술연구원 수자원연구실)
  • Received : 2012.11.12
  • Accepted : 2013.05.10
  • Published : 2013.05.31

Abstract

In this study, estimation methods for actual evapotranspiration have been studied using the concept of potential and actual evapotranspiration. Among the diverse estimation methods, SWAT-K application is chosen for hydrological modeling. For Jeju island we have characterized annual and monthly evapotranspiration using SWAT-K. In the results, simulated potential evapotranspiration reached to the 91% of small pan evaporation. With respect to the temperature lapse rate($-6^{\circ}C/km$) depending on the altitude of Halla mountain, evapotranspiration rate decreased by 7.5% compared to the status when the temperature data from the Jeju weather station were applied to the watershed. As the average of annual rainfall increased, potential evapotranspiration was increased, actual evapotranspiration was, however, decreased.

Acknowledgement

Supported by : 제주수자원연구단

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Cited by

  1. Estimation of Actual Evapotranspiration and Storage Change for the Bokahcheon Upper-middle Watershed vol.47, pp.7, 2014, https://doi.org/10.3741/JKWRA.2014.47.7.615