Planted mangroves and dune grass trap suspended sediment in their root systems, gradually raising and
extending the shoreline (accretion) while stabilizing it against future erosion.
accretion_rate = k1·mangrove_density + k2·grass_coverage
root_stabilization = 1 − e^(−λ·plant_age)
survival = f(density) — overcrowding reduces per-plant survival
- Mangrove density — fraction of the intertidal zone planted with mangrove saplings; strongest sediment trapper.
- Dune grass coverage — fraction of the upper beach planted with stabilizing grass.
- Simulated years — time-acceleration slider; watch the ecosystem mature over simulated years.
- Growing / Replant — pause growth or reset to a bare, freshly-replanted shoreline.
This reflects real "nature-based" shoreline restoration projects that use mangrove and dune-grass planting
to rebuild eroded coasts more cheaply and sustainably than hard engineering alone.