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http://dx.doi.org/10.3741/JKWRA.2011.44.12.915

A Study on the Hydroclimatic Effects on the Estimation of Annual Actual Evapotranspiration Using Watershed Water Balance  

Rim, Chang-Soo (Dept. of Civil Engineering, Kyonggi University)
Lim, Ga-Hui (Dept. of Civil Engineering, Kyonggi University)
Yoon, Sei-Eui (Dept. of Civil Engineering, Kyonggi University)
Publication Information
Journal of Korea Water Resources Association / v.44, no.12, 2011 , pp. 915-928 More about this Journal
Abstract
The main purpose of this study is to understand the effects of hydroclimatic factors on annual actual evapotranspiration and to suggest the multiple linear regression (MLR) equations for the estimation of annual actual evapotranspiration from watershed. To accomplish this study purpose, 5 dam watersheds (Goesan dam, Seomjingang dam, Soyanggang dam, Andong dam, Hapcheon dam) were selected as study watersheds and annual actual evapotranspiration was estimated based on annual water balance analysis from each watershed. The estimated annual actual evapotranspiration from water balance analysis was used to evaluate the MLR equations. Furthermore, the possibility of the estimation of actual evapotranspiration using potential evapotranspiration equations (Penman equation, FAO P-M equation, Makkink equation, Preistley-Taylor equation, Hargreaves equation) was evaluated. It has turned out that it is not appropriate to use potential evapotranspiration for the estimation of actual evapotranspiration because the correlation between actual evapotranspiration and potential evapotranspiration is very low. The comparison of MLR equations with current actual evapotranspiration equations indicates that MLR equations can be used for the estimation of annual actual evapotranspiration. Furthermore, it has turned out that the effects of hydroclimatic factors on annual actual evapotranspiration from dam watersheds are different in each watershed; however, for all watersheds in common precipitation has turned out to be the most important climatic factor affecting on the estimation of annual actual evapotranspiration.
Keywords
dam watershed; water balance; actual evapotranspiration; potential evapotranspiration;
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