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http://dx.doi.org/10.3741/JKWRA.2008.41.5.503

Application of Slope-area Discharge Estimation Method using Continuously Observed Water Level Data in a Gravel Bed River -Case Study of the Dal Cheon River-  

Lee, Chan-Joo (River & Coast Research Division, Korea Institute of Construction Technology)
Kim, Ji-Sung (River & Coast Research Division, Korea Institute of Construction Technology)
Kim, Chi-Young (River & Coast Research Division, Korea Institute of Construction Technology)
Kim, Dong-Gu (River & Coast Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.41, no.5, 2008 , pp. 503-515 More about this Journal
Abstract
In this study we calculate discharge by slope-area method using continuously observed water level data and analyse the results. This study is performed in the Dalcheon river reach of 960 m length including riffles and a pool, which is located downstream of the Goesan Dam. Three values of roughness coefficient are applied to discharge calculation, which are established using bed material size analysis. Another roughness coefficient value obtained from the river improvement plan is also used. Calculated discharges by slope-area method are compared with dam discharges. Relative difference from dam discharges appears to be largely affected by roughness values and a value of 0.042 or more seems most suitable for the entire study reach. Smaller roughness value is suitable to the reach which has gentler water surface slope than mean channel slope of the entire study reach, while a larger value to steeper reach. In case roughness value is set considering overall slope of the channel, it is desirable to select the entire calculation reach including both gentler and steeper sub-reaches. Since relative difference becomes nearly constant at over 500 cms, in case that verification of applied roughness is conducted with other directly measured discharge, accuracy of measurement by slope-area method for larger discharge may be improved.
Keywords
slope-area method; roughness coefficient; relative difference; water surface slope;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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