Breakwater Armour Stone v5.1 | Hudson + Full Van der Meer (Plunging/Surging, Permeability, Real‑Time 2D)

Breakwater Armour Stone v5.1

True Hudson (kN → tonnes) • Full Van der Meer (plunging/surging, permeability P) • Dynamic 2D cross‑section • Real‑time charts • Batch • PDF

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1. Design Parameters

Significant wave height H_s (m)

Peak wave period T_p (s)

Slope (cotα) e.g., 2 = 1:2

Rock unit weight γ_r (kN/m³)

Hudson K_D

Damage level S_d (Van der Meer)

2 = start of damage, 5–8 = moderate

Number of waves N

Permeability factor P

⚡ Updates instantly when you change Hs, slope or any parameter. Armour layer thickness scales with D_n50.

Enter wave conditions (H_s, T_p) and structure slope.
Set rock properties, Hudson K_D, damage S_d, permeability P.
Click “Compute” – get armour stone weight (tonnes) from both methods.
The 2D cross‑section updates: slope angle, armour layer thickness scaled by D_n50.
Bar chart compares Hudson vs Van der Meer; trend chart stores last 20 calculations.
Use batch CSV to process multiple designs or export PDF report with canvas snapshot.

❓ Why divide Hudson weight by 9.81?

Hudson formula returns weight in kN; dividing by 9.81 gives metric tonnes – we do it correctly.

❓ What is permeability P?

P=0.1 (impermeable core), 0.4 (rock rubble), 0.6 (highly porous). It strongly affects Van der Meer’s stability.

❓ How does Van der Meer distinguish wave types?

We compute surf similarity parameter ξ and critical ξ_cr; then apply plunging (breaking) or surging (non‑breaking) branch automatically.

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