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http://dx.doi.org/10.12652/Ksce.2013.33.3.947

Determination of Ecological Flow at the Confluence of Nakdong River and Gumho River Using River2D  

Seo, Il Won (Seoul National University)
Park, Inhwan (Seoul National University)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.33, no.3, 2013 , pp. 947-956 More about this Journal
Abstract
In this study, WUA (Weighted Usable Area) was calculated to determine ecological flow at the confluence of Nakdong River and Gumho River by using River2D. To calibrate River2D, simulation results of River2D were compared with calibrated HEC-RAS simulation results and the optimum parameters were determined. After parameter calibration, WUA of Zacco platypus and Zacco temmincki which are dominant species in Nakdong River was calculated with changing upstream flowrate. From the result, WUA is changed according to flowrate and growth stage. In the flowrate-WUA/A graph, ecological flow can be determined as $33.3m^3/s{\sim}39.96m^3/s$ in Nakdong River and $3.6m^3/s{\sim}4.32m^3/s$ in Gumho River. After dredging for Four major rivers restoration project, WUA of Zacco platypus and Zacco temmincki were calculated by using the ecological flow. The results show that WUA after dredging are decreased when compared with undredged condition. WUA of Common carp is 2~3 times bigger than WUA of Zacco platypus and Zacco temmincki at the dredged condition in Nakdong River.
Keywords
River confluence; River dredging; Ecological flow; River2D; WUA;
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Times Cited By KSCI : 8  (Citation Analysis)
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