Effective roughness height in high-concentrated flows

Jiayu Fang, Yongping Chen*, Peng Yao, Min Su

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
102 Downloads (Pure)


The effective roughness height is an important parameter in coastal sediment transport models. It has been extensively investigated in the past but few research results are related to the high-concentrated flows which often occur in a silty coast. A series of experiments has been carried out in a wave-current flume with silt-sized sediment bed. The mean velocity profiles were measured under different combined wave-current conditions. The effective roughness heights were calculated based on the curve fitting of measured velocity profiles by following the velocity profile model of You (1994). The accuracy of three empirical models, namely, Grant and Madsen (1982), Li and Amos (1998) and You (1996) was examined with the 'measured' effective roughness heights. The results show that all the models are not much accurate for the high-concentrated flows, particularly in the case with a relatively small sediment size. Therefore, cautions should be taken when applying those models in the silty coast, particularly during the extreme events.

Original languageEnglish
Pages (from-to)53-57
Number of pages5
JournalJournal of Coastal Research: an international forum for the Littoral Sciences
Issue number75
Publication statusPublished - 1 Mar 2016
Event14th International Coastal Symposium - Sydney, Australia
Duration: 6 Mar 201611 Mar 2016
Conference number: 14


  • Bed resistance
  • Sediment transport model
  • Silty coast


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