Stability of Hardly Reshaping Berm Breakwaters

Thomas Lykke Andersen, Jentsje W. Van der Meer, Hans F. Burcharth, Sigurdur Sigurdarson

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review


The present paper deals with stability of berm breakwaters designed to be hardly or sometimes partly reshaping. Burcharth (2008, 2011) showed by comparison to the performance of a prototype berm breakwater that the Van der Meer formulae for stability of conventional rock armour including low crests could predict the deformations of the front slope in terms of the eroded area. The present paper verifies the method by comparison to model test results. It is found that the Van der Meer formula for plunging waves predicts very well the eroded area of the reshaped profile, even if it is applied in the surging wave area. Moreover, a simple method to estimate the erosion area based on recession formulae and the depth of intersection of reshaped and initial profile is presented and is applicable for hardly reshaping to fully reshaping. Even when using the only very simple and inaccurate estimate of the depth of intersection the last method leads to scatter quite similar to the first method when considering hardly and partly reshaping berm breakwaters. The influence of the slope angle is though expected to be more correctly included for hardly reshaping breakwaters using the method for straight non-overtopped slopes when the slope angle is 1:1.5 or flatter.
Original languageEnglish
Title of host publicationCoastal Engineering 2012 : Proceedings of 33rd International Conference on Coastal Engineering
EditorsPatrick Lynett, Jane McKee Smith
Number of pages11
PublisherAmerican Society of Civil Engineers
Publication date2012
Publication statusPublished - 2012
EventInternational Conference on Coastal Engineering - Santander, Spain
Duration: 29 Jun 201230 Jun 2012
Conference number: 33


ConferenceInternational Conference on Coastal Engineering
SeriesProceedings of the International Conference on Coastal Engineering


  • Breakwaters
  • Berm Breakwater
  • Stability
  • Damage
  • Recession


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