page_title: Accropode
section_title: Hydraulic stability
hierarchical_section_title: Accropode / Design / Hydraulic stability
caption_attribution_description: English: Accropode 3D simulation
context_page_description: Accropode blocks are man-made unreinforced concrete objects designed to resist the action of waves on breakwaters and coastal structures.
context_section_description: Specified stability coefficients at design stage:
  Hudson’s design KD values:
  15 on trunk sections (16 for Accropode II)
  11.5 on roundheads (12.3 for Accropode II)
  Van der Meer stability number:
  NS = HS/(∆ Dₙ₅₀)= 2.7 (2.8 for Accropode II)
  where:
  HS = significant wave height
  ∆ = relative mass density
  Dₙ₅₀ = nominal diameter
  These coefficients are valid for armour slopes from 3H/2V to 4H/3V and for seabed slopes up to 3%.
  The uneven surface of the Ecopode improves interlocking by friction, thereby increasing hydraulic stability.
caption: 3D simulation of wave motion near an accropodes.[1]
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