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Accropode (1981) The Accropode is a single-layer artificial armour unit developed by Sogreah in 1981. Accropode concrete armour units are applied in a single layer. Ecopode (1996) The Ecopode armour unit with a rock-like appearance was developed by Sogreah to enhance the natural appearance of concrete armourings above low water level.
Tetrapods on Graciosa Island, Azores Tetrapods in Latvia Tetrapods protecting a marina on Crete, Greece.. A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters.
The diameter of shields greatly varied, ranging from 0.3 to 0.92 m (1 to 3 ft), although most shields were between 0.46 to 0.66 m (1 ft 6 in to 2 ft 2 in) in diameter. [92] Their thickness ranged from 5–13 mm (0.20–0.51 in), but most were between 6–8 mm (0.24–0.31 in) in width. [90]
This equation was rewritten as follows in the nineties: = () / where: H s is the design significant wave height at the toe of the structure (m); Δ is the dimensionless relative buoyant density of rock, i.e. (ρ r / ρ w - 1) = around 1.58 for granite in sea water
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[1] [2] [3] Riprap is used to armor shorelines, streambeds, bridge abutments, foundational infrastructure supports and other shoreline structures against erosion. [ 1 ] [ 2 ] [ 3 ] Common rock types used include granite and modular concrete blocks.
The 33rd Armor Regiment was an armored regiment in the United States Army first formed in 1941. In 2005, the 33rd Armor was redesignated 33rd Cavalry Regiment. The 1st Squadron, 33rd Cavalry Regiment, a part of the 3rd Brigade Combat Team, 101st Airborne Division, carries on the lineage of 33rd Armor Regiment.