Variations in roughness predictions (flume experiments)

Daniëlle Noordam, Astrid Blom, H. van der Klis, Suzanne J.M.H. Hulscher

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Data of flume experiments with bed forms are used to analyze and compare different roughness predictors. In this study, the hydraulic roughness consists of grain roughness and form roughness. We predict the grain roughness by means of the size of the sediment. The form roughness is predicted by three approaches: Van Rijn (1984), Vanoni & Hwang (1967) and Engelund (1966). The total roughness values (friction factors) are compared with the roughness values according to the DarcyWeisbach equation. Results show that the different methods predict different friction factors. In future research uncertainties in the hydraulic roughness will be taken into account to determine their influence on the computed water levels.
Original languageUndefined
Title of host publicationProceedings NCR-days 2004, Research for managing rivers; present and future issues
EditorsA. Makaske, H.P. Wolfert, A.G. van Os
Publication statusPublished - 4 Nov 2005
EventNCR-days 2004: NCR-day 2004. Research for managing rivers; present and future issues - Wageningen, The Netherlands, Wageningen
Duration: 4 Nov 20045 Nov 2004

Publication series

NameNCR publication


ConferenceNCR-days 2004
OtherNovember 4 – 6, 2004


  • METIS-224916
  • IR-52923

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