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http://dx.doi.org/10.3741/JKWRA.2010.43.11.945

Development of Subsection Division Method to Estimate a Composite Roughness Coefficient  

Kim, Ji-Sung (River & Coast Research Division, Korea Institute of Construction Technology)
Kim, Keuk-Soo (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.43, no.11, 2010 , pp. 945-956 More about this Journal
Abstract
Practically, the composite roughness coefficient, which is the equivalent roughness coefficient of a cross-section where the wall roughness is not constant along the wetted perimeter, is used to describe the flow conditions in open channels. In this study, it was conducted that the previous formulae was classified according to a weighting factor of the local resistance. The new subsection division method was also developed based on the force-balance concept in each subsection. The accuracy of the proposed method was examined and the applicability and limitation of the 13 existing formulae were analyzed by comparing the calculated with the experimental measured data from Djajadi (2009) and Knight and Macdonald (1979). It was found that Horton's method might underestimate the total conveyance of a composite channel and Lotter's method showed a good agreement between calculated and measured data. However, the proper division method, such as the proposed method based on the Z-method, is required for the application of Lotter's method.
Keywords
composite roughness coefficient; subsection division; divided-channel method; Z-method;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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