STABILITY OF CUBIPOD ARMOURED ROUNDHEADS IN SHORT-CRESTED WAVES. A COMPARISON BETWEEN CUBIPOD AND CUBE ARMOUR STABILITY

Hans Falk Burcharth, Thomas Lykke Andersen, Josep R. Medina

Abstract


The paper presents a comparison of the stability of concrete cube armour and Cubipod armour in a breakwater roundhead with slope 1:1.5, exposed to both 2-D (long-crested) and 3-D (short-crested) waves. The model tests were performed at the Hydraulics and Coastal Engineering Laboratory at Aalborg University, Denmark. The model tests
showed that Cubipod armour is more stable than cube armour when exposed to longer waves (steepness approx. 0.025) and has equal stability to cubes in shorter waves. The Cubipod armour layer contained due to its high porosity approximately 6-17% less concrete than the cube armour layer. Therefore, it was concluded that per used volume of
concrete the Cubipods perform better than the cubes.

Keywords


breakwaters; concrete armour; Cubipod; roundheads; short-crested waves

References


Aalborg University 2008a. AwaSys 5 - Wave Generation and Active Absorption Software. http://hydrosoft.civil.aau.dk/AwaSys. Dept. of Civil Engineering, Aalborg University.

Aalborg University 2008b. WaveLab2 - Data Acquisition and Analysis Software for Wave Laboratories. http://hydrosoft.civil.aau.dk/wavelab. Dept. of Civil Engineering, Aalborg University.

Burcharth, H.F., Lykke Andersen, T. and Urrutia Aldama, J.M. 2009. Three-Dimensional Model Tests Study of a Cubipod Armoured Roundhead. DCE Contract Report No 58. Division of water and Soil, Department of Civil Engineering, Aalborg University, Denmark.

Gómez-Martin, M.E. and Medina, J.R. 2008. Erosion of Cubipod armour layers under wave attack. Proc. 31st International Conference on Coastal Eng., ASCE, 3461-3473.

Hashimoto, N. and Kobune, K. 1988. Estimation of directional spectrum from a Bayesian approach. Proc. 21st International Conference on Coastal Eng., ASCE, 62-72.

Macineira, E. and Burcharth, H.F. 2007. New formula for stability of cube armoured roundheads. Proc. 5th Coastal Structures 2007 International Conference, World Scientific, 31-40.


Full Text: PDF

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 License.