Stability of Hardly Reshaping Berm Breakwaters

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

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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.
TitelCoastal Engineering 2012 : Proceedings of 33rd International Conference on Coastal Engineering
RedaktørerPatrick Lynett, Jane McKee Smith
Antal sider11
ForlagAmerican Society of Civil Engineers
StatusUdgivet - 2012
BegivenhedInternational Conference on Coastal Engineering - Santander, Spanien
Varighed: 29 jun. 201230 jun. 2012
Konferencens nummer: 33


KonferenceInternational Conference on Coastal Engineering
NavnProceedings of the International Conference on Coastal Engineering


  • Breakwaters
  • Berm Breakwater
  • Stability
  • Damage
  • Recession


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