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15 on trunk sections (16 for Accropode II) 11.5 on roundheads (12.3 for Accropode II) Van der Meer stability number : N S = H S /(∆ D n50)= 2.7 (2.8 for Accropode II) where: H S = significant wave height ∆ = relative mass density D n50 = nominal diameter These coefficients are valid for armour slopes from 3H/2V to 4H/3V and for seabed ...
Tetrapods were originally developed in 1950 by Pierre Danel and Paul Anglès d'Auriac of Laboratoire Dauphinois d'Hydraulique (now Artelia) in Grenoble, France, who received a patent for the design. [3] The French invention was named tétrapode, derived from Greek tetra-' four ' and -pode ' foot ', a reference to the tetrahedral shape.
ρ r and ρ w are the densities of rock and (sea)water (kg/m 3) D n50 is the nominal median diameter of armor blocks = (W 50 /ρ r) 1/3 (m) K D is a dimensionless stability coefficient, deduced from laboratory experiments for different kinds of armor blocks and for very small damage (a few blocks removed from the armor layer) (-):
[1] [2] [3] Common rock types used include granite and modular concrete blocks. [4] [5] Rubble from building and paving demolition is sometimes used, [3] [6] as well as specifically designed structures called tetrapods or similar concrete blocks. Riprap is also used underwater to cap immersed tubes sunken on the seabed to be joined into an ...
Large Xblocs (8.0 m 3 or 280 cu ft) on a trial placement area. An Xbloc is a wave-dissipating concrete block (or "armour unit") designed to protect shores, harbour walls, seawalls, breakwaters and other coastal structures from the direct impact of incoming waves.
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For example, rock can weigh between 150-175 lb; [2] a suitable rip-rap boulder comparable to a 96 inch A-Jacks unit (about 36 c.f.) would weigh about 5800 pounds, about 16% more than the A-Jacks unit. A-Jacks also have the advantage of being interlocking and self-stabilizing.
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