Scale Effects Related to Small Physical Modelling of Overtopping of Rubble Mound Breakwaters

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By comparison of overtopping discharges recorded in prototype and small scale physical models it was demonstrated in the EU-CLASH project that small scale tests significantly underestimate smaller discharges. Deviations in overtopping are due to model and scale effects. These effects are discussed in the paper and it is explained why it is impossible quantitatively to identify model and scale effects by comparison of the performance of prototype and small scale models. For such identification are needed special dedicated tests. The paper presents such a test which identify the scale effect in the rubble armour on the upper part of the slope. This effect is believed to be the main reason for the found deviations between overtopping in prototype and small scale tests.
Original languageEnglish
Title of host publicationCoastal Structures 2007 : Proceedings of the 5th International Conference : Venice, Italy, 2-4 July 2007
EditorsLeopoldo Franco, Giuseppe R. Tomasicchio, Alberto Lamberti
Number of pages11
PublisherWorld Scientific
Publication date2009
ISBN (Print)9789814280990 (set), 9814280992 (set), 9789814282017 (Volume 2), 9814282014 (Volume 2)
Publication statusPublished - 2009
EventCoastal Structures - Venice, Italy
Duration: 2 Jul 20074 Jul 2007
Conference number: 5


ConferenceCoastal Structures

Bibliographical note

PDF for print: 11 pp.


  • Breakwaters
  • Rubble Mound Breakwaters
  • Overtopping Breakwaters
  • Scale Effects


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