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http://dx.doi.org/10.3741/JKWRA.2007.40.10.755

Calculation of Roughness Coefficient in Gravel-bed River with Observed Water Levels  

Kim, Ji-Sung (River & Coast Research Division, Korea Institute of Construction Technology)
Lee, Chan-Joo (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.10, 2007 , pp. 755-768 More about this Journal
Abstract
The purpose of this study is to analyse the characteristics of Manning's roughness coefficient according to change of discharge by using observed data obtained from a stable gravel-bed river and to investigate the applicability of the relevant existing empirical methods to it. Observed water level and discharge data are used as input data for the USGS computer program NCALC model for calculation of the roughness coefficient. Calculated values are compared with roughness values which are estimated with four widely used methods. The results show that though the empirical methods are able to give similar roughness values only for flood flow, they seem to have rather high uncertainty because of necessity of subjective judgement and differences of resultant values. Roughness coefficients for normal-low flow cannot be estimated from the existing empirical formulae. Especially, using the Manning equation for calculating them should be careful as this provides a wide range of estimated values in normal-low flow. The relations between the roughness coefficient and characteristic size of bed materials are different from them in flood flow even though they have a close relations.
Keywords
roughness coefficient; gravel bed river; field data; relative roughness;
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