Good hydraulic stability shown in extensive physical scale-model testing.
Specified stability coefficients at design stage: - Hudson's design KD values : 15 on trunk sections 11.5 on roundheads
- Van der Meer stability number
NS = HS/(∆ Dn50) = 2.7 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
