xbloc-design-guidelines-2011.pdf (2.2MB)

7 Rear Armour Design
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Guidelines for Xbloc Concept Designs
The design of the rear armour is determined by:
• The overtopping waves;
• The waves at the rear side of the breakwater (mostly as a result of wave
penetration).
In this section it is assumed that the wave climate at the rear side of the breakwater is
calm (hence no significant wave penetration, ship induced waves etc.).
There is no generic design formula for rear armour as the geometry of the breakwater
has a large impact on the overtopping volume and on the wave impacts on the rear
armour. Figure 6-1 and Figure 6-2 give an overview of the rear armour at typical
breakwater cross sections depending on the relative freeboard and whether or not
access to the breakwater is required.
Please note that these are typical sketches and that physical model tests are required
for detailed rear armour design.