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http://dx.doi.org/10.3741/JKWRA.2012.45.9.853

Analysis of Loop-Rating Curve in a Gravel and Rock-bed Mountain Stream  

Kim, Dong-Su (Department of Civil & Environmental Engineering, Dankook University)
Yang, Sung-Kee (Department of Civil Engineering, Jeju National University)
Yu, Kwon-Kyu (Department of Civil Engineering, Dong-eui University)
Publication Information
Journal of Korea Water Resources Association / v.45, no.9, 2012 , pp. 853-860 More about this Journal
Abstract
It is well-known that loop effect of the stage-discharge relationship is formulated based on many field observations especially for the sand rivers. Theoretical understandings of the loop effect for the sand rivers have been widely provided, based on the facts that it is driven by the flood wave propagation and bed form changes over the given flood period. However, very few theoretical studies or field observations associated with loop-rating curves in the gravel or rock-bed mountain streams have been attempted so far, due particularly to the difficulties in the accurate discharge measurement during the flood in such field conditions. The present paper aims to report a unique loop-rating curve measured at a gravel and rock-bed mountain stream based on the flood discharge observation acquired during the typhoon, Muifa that passed nearby Jeju Island in summer of 2011. As velocity instrumentation, a non-intrusive Surface Velocity Doppler Radar to be suitable for the flood discharge measurement was utilized, and discharges were consecutively measured for every hour. Interestingly, the authors found that the hysteresis of the loop-rating curve was adverse compared to the typical trend of the sand bed streams, which means that the discharge of the rising limb is smaller than the falling limb at the same stage. We carefully speculate that the adverse trend of the loop-rating curve in the gravel bed was caused by the bed resistance change that works differently from the sand bed case.
Keywords
stage-discharge relationship; loop-rating curve; mountain stream; gravel-bed; hysteresis;
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Times Cited By KSCI : 3  (Citation Analysis)
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