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http://dx.doi.org/10.3741/JKWRA.2009.42.12.1113

Evaluation of Channel-forming Discharge for the Abandoned Channel Restoration Design of Cheongmi Stream  

Ji, Un (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Kang, Jun-Gu (Dept. of Water Resources Research, Korea Institute of Construction Technology)
Yeo, Woon-Kwang (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Han, Seung-Won (Dept. of Civil and Environmental. Engrg., Myongji Univ.)
Publication Information
Journal of Korea Water Resources Association / v.42, no.12, 2009 , pp. 1113-1124 More about this Journal
Abstract
The abandoned channel restoration is one of methods to enhance the environmental function and ecological habitat as well as the functions of water-utilization and flood control. The channel-forming or dominant discharge must be evaluated and defined to design the cross-sectional and plane geometries of the stable and equilibrium channel for the abandoned channel restoration project. In general, bankfull discharge, specified recurrence interval discharge, and effective discharge have been used to decide the channel-forming discharge. In this study, bankfull discharge, specified recurrence interval discharge, and effective discharge were calculated and compared for the abandoned channel restoration site of Cheongmi Stream and their relations to historical bed changes were analyzed. The bankfull discharge, 488 $m^3/s$, of the abandoned channel restoration site of Cheongmi Stream was calculated using HEC-RAS data and ranged between 1.5-year and 2-year recurrence discharges. Also, the effective discharge evaluated with the sediment rating curve and mean daily discharge data is greater than the bankfull discharge. According to the survey data of 1994 and 2008, the bed elevation of the study reach was decreased over time. It is indicated that the channel bed is changing to the stable condition to allow the effective discharge.
Keywords
river restoration; abandoned channel restoration; dominant discharge; channel-forming discharge; bankfull discharge; specified recurrence interval discharge; effective discharge;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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