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http://dx.doi.org/10.3741/JKWRA.2004.37.12.1055

Unsteady Flow Model with Variable Roughness Coefficient  

Kim, Han- Joon ((주)유신 코퍼레이션 수자원부)
Jun, Kyung- Soo (성균관대학교 토목환경공학과)
Publication Information
Journal of Korea Water Resources Association / v.37, no.12, 2004 , pp. 1055-1063 More about this Journal
Abstract
An unsteady flow model is developed that allows variable roughness coefficient for each computational point according to its spatial position and the discharge. A step function or a power function can be used for functional relation between the discharge and the Manning's roughness coefficient. The model is applied to the reach of the South Han River between the Chungju Dam and Paldang Dam, and model parameters are estimated by optimization. Estimated parameters of both the step function model and the Power function model show that Manning's roughness coefficient decreases as the discharge increases. This tendency is more noticeable for the upstream reach of Yeoju compared to the downstream reach. It turns out that the stages calculated by the variable roughness coefficient model agree better with the observed ones than those by the conventional fixed parameter model.
Keywords
unsteady flow model; variable roughness coefficient; optimal estimation; South Han River;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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