TOE ROCK STABILITY FOR RUBBLE MOUND BREAKWATERS

Proceedings of the International Conference on Coastal Engineering

Reinder Ebbens¹  Stephan Baart³  Henk Jan Verhagen²  Julia Nammuni-Krohn⁴ 

[1] DHV;Delft University of Technology;Lievense Consulting Engineers;Halcrow

关键词: rubble mound breakwater;    toe structure;    toe bund;    rock stability;    wave load;    foreshore slope;   

DOI  :  10.9753/icce.v32.structures.35

学科分类：建筑学

来源: Coastal Engineering Research Council

【 摘 要 】

Present design tools, as found in the Rock Manual or Coastal Engineering Manual, for the determination of toe rock size for rubble mound breakwaters are based on test data with a large spread: data is relatively dispersed around the centre and descriptive equations have limited applicability ranges. New research has been undertaken to contribute to a more accurate description of toe rock stability. Flume tests have lead to an empirical design criterion for toe bunds in very shallow water based on the Hudson-type stability number. Herein the foreshore slope turns out to have an important influence. An approach with theoretical background has been used for toe bunds in surging wave conditions. The resulting stability description, based on local flow velocities, has been verified with existing data sets. Additional flume tests were performed to measure flow velocities at the toe bund. Results are used to calibrate the velocity-approach, providing an improved design criterion.

【 授权许可】

Unknown