Desert Dunes (2D)

Wind-blown sand doesn't drift evenly across a desert — it saltates, hopping grain by grain downwind, eroding the gentle windward face of a dune and cascading down its steep lee slip face until the whole dune has crept forward. This 2D cross-section companion lets you dial in wind speed and sand supply and watch a barchan dune's profile migrate downwind at the rate Bagnold's classic saltation law predicts: sand flux rises with the cube of wind speed above the threshold needed to lift grains at all, while migration speed is that flux divided by the dune's own height, so small, sand-starved dunes race across the desert while tall, well-supplied ones creep along at a fraction of the pace — exactly the process sculpting the site's interactive 3D desert dunes.