This concrete armour unit benefits from the technical characteristics of the single-layer design.
The uneven surface improves interlocking by friction, thereby increasing hydraulic stability.
ECOPODE™ can thus be placed above the low water line, over ACCROPODE™ II units.
At the design stage, the prevailing stability coefficients can be taken to be those of the ACCROPODE™ II used in the underwater part of the rubble mound.
The standard Hudson’s design KD values for breaking or non-breaking wave conditions are: • 16 on breakwater trunk sections • 12.3 on breakwater roundheads
Alternatively, the recommended Van der Meer stability number is:
NS = HS/(∆ Dn50) = 2.8 where
HS
=
significant wave height
∆
=
relative mass density
Dn50
=
nominal diameter
These coefficients are valid for armour slopes from 3H/2V to 4H/3V. However for breaking waves and a seabed slope greater than 1%, lower values shall apply.
Background
