Interactive demo

Try GRLP live in your browser — no installation required. The model runs entirely on your machine via Pyodide (Python compiled to WebAssembly); nothing is sent to a server.

This demo evolves a single-segment gravel river through time. Press ▶ Run, then drag the sliders while the simulation runs and watch the long profile respond:

• Water discharge \(Q\) — more water lowers the equilibrium slope (gentler profile).

• Bed-load sediment input \(Q_s\) — more sediment steepens it.

• Base level — raising or lowering the downstream boundary aggrades or incises the profile.

These are the three controls of Lane’s balance, played out dynamically. Use Set to equilibrium to jump to the steady state for the current settings.

Note

The demo takes ~10–30 s to start the first time while your browser downloads the Python runtime, then runs smoothly. Best viewed on a full-width screen.

The same demo is available as a Jupyter notebook (for classroom or notebook use) in the project’s interactive_demo/ directory.