Erosion(t) ≈ k_pollution · t^0.5
σ_seismic ∝ m·a_ground / A_base
Integrity = 100% − erosion·w1 − stress·w2
Stone monuments degrade through chemical weathering (accelerated by acid rain / SO₂ pollution, roughly following a diffusion-like square-root time law) and mechanical stress from earthquakes. This sim combines a surface erosion model with a simplified seismic stress model on a classical column structure, and lets you toggle a protective conservation coating that slows erosion.
- Weathering years — simulated time elapsed; erosion accumulates and pitting appears on the stone surface.
- Acid rain / pollution — scales the erosion rate constant, from clean air to heavy industrial pollution.
- Seismic intensity — shakes the structure and raises internal stress, risking cracking or collapse above a threshold.
- Conservation coating — a protective consolidant that cuts the erosion rate, as used in real heritage conservation.
Real-world application: conservators use exactly this kind of degradation modeling to prioritize restoration work on monuments like the Parthenon or Angkor Wat.