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DOI : 10.17640/KSWST.2015.23.5.131 , Vol.23, No.5, 131 ~ 148, 2015
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| Title |
| Analysis of Water Budget Characteristics Based on Observed Hydrological Data in the Mountainous River Basin |
| 이연길 Yeon Gil Lee , 정성원 Sungwon Jung , 임배석 Baeseok Im , 윤양실 Yangsil Yun , 이경훈 Gyeonghun Lee , 김동필 Dong Phil Kim |
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| Abstract |
| This study estimates water budget characteristics based on observed hydrological data in mountainous river basin. We selected Seolmachoen test basin that is located in Han-river basin by study area. We considered water budget equation including four water elements to analysis water budget characteristics. This equation includes rainfall, runoff, evapotranspiration and storage variation. Four hydrological elements was quantified respectively by hydrological data observed for two years(2013～2014). We used daily rainfall and runoff data that were observed regularly by KICT(Korea Institute of Civil Engineering and Building Technology) in the Seolmachoen basin. We used latent flux observed in 20m flux tower with eddy covariance method to quantify daily evapotranspiration. And we gap-filled daily evapotranspiration data based on eddy covariance by three methods(FAO-PM, MDV and Kalman Filter). For calculation of storage variation, we used soil moisture content that is quantified to average individual soil moisture rate observed by TDR(Time Domain Reflectometry) sensor at soil depth. The soil moisture variation is calculated in consideration from initial to final soil moisture content. According to the result of this study, water budget is relatively well closed in 2013, but isn``t closed in 2014. Water budget error in years is calculated about 6.23%～6.83% of annual rainfall in 2013, but is calculated about 5.96%～20.49% in 2014. It is difficult to judge water budget error in Seolmachoen. We estimated soil moisture content as one of water budget errors, because soil moisture content didn``t represent actual storage variation. |
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| Key Words |
| water budget, hydrological data, evapotranspiration, eddy covariance, TDR |
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