| Evaluation on applicability of on/off-line parameter calibration techniques inrainfall-runoff modeling |
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학술지명 한국수자원학회
저자 김연수,유완식,이기하,이대업
발표일 2017-03-09
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This study aims to evaluate applicability of both online and offline parameter calibration techniques on rainfall-runoff modeling usinga conceptual lumped hydrologic model. To achieve the goal, the storage function model was selected and then two different automaticcalibration techniques: SCE-UA (offline method) and particle filter (online method) were applied to calibrate the optimal parameter setsfor 9 rainfall events in the Cheoncheon catchment, upper area of the Yongdam multi-purpose dam. In order to assess reproducibility ofhydrographs from the parameter sets of both techniques, the observed discharge of each event was divided into low flow (below averageflow) and high flow (over average flow). The results show that the particle filter method, updating the parameters in real-time, providesmore stable reproducibility than the SCE-UA method regardless of low and high flow. The optimal parameters estimated by SCE-UAare very sensitive to the selected objective functions used in this study: RMSE and HMLE. In particular, the parameter sets from RMSEand HMLE demonstrate superior goodness-of-fit values for high flow and low flow periods, respectively |