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http://dx.doi.org/10.3741/JKWRA.2018.51.5.425

Identification of yearly variation in Hwacheon dam inflow using trend analysis and hydrological sensitivity method  

Kim, Sang Ug (Department of Civil Engineering, Kangwon National University)
Lee, Cheol-Eung (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of Korea Water Resources Association / v.51, no.5, 2018 , pp. 425-438 More about this Journal
Abstract
Existing studies that analyze the causes and effects of water circulation use mostly rainfall - runoff models, which requires much effort in model development, calibration and verification. In this study, hydrological sensitivity analysis which can separate quantitatively the impacts by natural factors and anthropogenic factor was applied to the Hwacheon dam upper basin from 1967 to 2017. As a result of using various variable change point detection methods, 1999 was detected as a statistically significant change point. Especially, based on the hydrological sensitivity analysis using 5 Budyko based functions, it was estimated that the average inflow reduction amount by Imnam dam construction was $1.890\;billion\;m^3/year$. This results in this study was slightly larger than the those by existing researchers due to increase of rainfall and decrease of Hwacheon dam inflow. In future, it was suggested that effective water management measures were needed to resolve theses problems. Especially, it can be suggested that the monthly or seasonal analysis should be performed and also the prediction of discharge for future climate change should be considered to establish resonable measures.
Keywords
Hydrological sensitivity analysis; Change point; Hwacheon dam inflow; Imnam dam;
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