The influence of a berm and roughness on the wave overtopping at dikes

W. Chen*, M.R.A. van Gent, J.J. Warmink, S.J.M.H. Hulscher

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

19 Citations (Scopus)
13 Downloads (Pure)


A reliable estimation of average wave overtopping discharge is important for dike design and safety assessment. Berms and roughness elements are widely applied to reduce the overtopping discharge over dikes. In this study, the effects of a berm and roughness on the wave overtopping discharge are investigated by means of physical model tests. New empirical formulae are derived from the analysis of the experimental data in order to provide more accurate estimations of reductive influence of berms and roughness on the wave overtopping discharge. Additionally, a new formula is developed to estimate the reductive influence of varying roughness along the waterside slopes with a berm. The new equations show a significantly better performance within the tested range when compared with existing formulae for the average overtopping discharge.
Original languageEnglish
Article number103613
Number of pages15
JournalCoastal engineering
Early online date4 Dec 2019
Publication statusPublished - Mar 2020


  • UT-Hybrid-D
  • Block revetment
  • Laboratory experiments
  • Overtopping discharge
  • Varying roughness
  • Berm
  • 22/2 OA procedure


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