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http://dx.doi.org/10.3741/JKWRA.2012.45.8.783

Development and Accuracy Analysis of the Discharge-Supply System to Generate Hydrographs for Unsteady Flow in the Open Channel  

Kim, Seo-Jun (Dept. of Civil & Environmental Eng., Myongji University)
Kim, Sang-Hyuk (Dept. of Civil & Environmental Eng., Myongji University)
Yoon, Byung-Man (Dept. of Civil & Environmental Eng., Myongji University)
Ji, Un (Dept. of Civil & Environmental Eng., Myongji University)
Publication Information
Journal of Korea Water Resources Association / v.45, no.8, 2012 , pp. 783-794 More about this Journal
Abstract
The analysis for unsteady flow is necessary to design the hydraulic structures affected by water level and discharge changes through time. The numerical model has been generally used for unsteady flow analysis, however it is difficult to acquire field data to calibrate and validate the numerical model. Even though it is possible to collect field data for some case, high cost and labor are required and sometimes it is considered that the confidence of measured data is very low. In this case, the experimental data for unsteady flow can be used to calibrate and validate the numerical model as an alternative. Therefore, the discharge-supply system which could generate various type of unsteady flow hydrograph was developed in this study. Also, the accuracy of the unsteady flow hydrograph generated by developed dischargesupply system in the experiment was evaluated by comparing with target hydrograph. Accuracy errors and Root Mean Square Error (RMSE) were analyzed for the rectangular-type hydrograph with sudden changes of flow, triangular-type hydrograph with short peak time, and bell-type flood hydrograph. As a result, the generating error of the discharge-supply system for the rectangular-type hydrograph was about 59% which was maximum error among various types. Also, it was represented that RMSE for the triangular-type hydrographs with single and double peaks were approximately corresponding to 10%. However, RMSE for the bell-type flood hydrograph was lower than 2%.
Keywords
unsteady flow; discharge-supply system; hydrograph; accuracy analysis; error analysis;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
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