Kelp Forest Simulator (2D)

Current

Current strength 50%

Kelp Forest

Kelp density 24

Growth rate 50%

Kelp fronds swaying in a gentle current…

Live Readout

Fronds

Max sway

0°

Canopy height

Time elapsed

How it works

Kelp is anchored to the seafloor by a root-like holdfast and grows a flexible stipe (stalk) topped with gas-filled bladders that hold blades toward sunlight near the surface. Because the stipe is elastic and buoyant rather than rigid, it bends under drag instead of snapping — the same principle that lets tall grass and reeds survive wind gusts that would break a stiff rod.

This simulation models each frond as a chain of segments: a horizontal drag force from the current pushes harder on segments closer to the buoyant tip, while a spring-like restoring force pulls the stipe back toward vertical. Higher current strength increases drag amplitude and sway angle; higher growth rate makes fronds reach their full height and canopy coverage faster.

Real kelp forests are one of the most productive ecosystems on Earth — dense canopies can grow over 30 cm a day — and provide shelter and food for sea otters, fish, and invertebrates, much like an underwater equivalent of a forest canopy.

Kelp sways with the current — fronds grow taller and denser over time