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http://dx.doi.org/10.3741/JKWRA.2007.40.12.957

Application of Chiu's Two Dimensional Velocity Distribution Equations to Natural Rivers  

Lee, Chan-Joo (River & Coast Research Division, Korea Institute of Construction Technology)
Seo, Il-Won (Seoul National University)
Kim, Chang-Wan (River & Coast Research Division, Korea Institute of Construction Technology)
Kim, Won (River & Coast Research Division, Korea Institute of Construction Technology)
Publication Information
Journal of Korea Water Resources Association / v.40, no.12, 2007 , pp. 957-968 More about this Journal
Abstract
It is essential to obtain accurate and highly reliable streamflow data for quantitative management for water resources. Thereafter such real-time streamflow gauging methods as ultrasonic flowmeter and index-velocity are introduced recently. Since these methods calculate flowrate through entire cross-section by measuring partial velocities of it, rational and theoretical basis are necessary for accurate estimation of discharge. The purpose of the present study lies in analysis on the applicability of Chiu#s(1987, 1988) two dimensional velocity distribution equations by applying them to natural rivers and by comparing simulated velocity distributions with observed ones obtained with ADCP. Maximum and mean velocities are calculated from observed data to estimate entropy parameter M. Such isovel shape parameters as h and $\beta_i$ are estimated by object function based on least squares criterion. In case optimized parameters are applied, Chiu#s velocity distributions fairly well simulate observed ones. By using 14 simulated data sets which have relatively high correlation coefficients, properties of parameters are analyzed and h, $\beta_i$ are estimated for velocity-unknown river sections. When estimated parameters are adopted for verification, simulated velocity distributions well reproduce real ones. Finally, calculated discharges display rough agreement with measured data. The results of the present study mean that if parameters related are properly estimated, Chiu#s velocity distribution is likely to reproduce the real one of natural rivers.
Keywords
entropy; 2-D velocity distribution; Acoustic Doppler Current Profiler(ADCP); parameters;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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