A dune is a sediment bedform. In the elementary subcritical flow description of river dunes, bed undulations and free-surface undulations are out of phase. This phase relation identifies a hydraulic response; instability additionally requires a positive real part of the relevant dispersion relation. Contrast the in-phase surface of an antidune.
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"Dune" is a science fiction novel written by Frank Herbert, first published in 1965. It is considered one of the greatest science fiction books of all time and has a vast and intricate universe. The story is set in a distant future amidst a huge interstellar empire, primarily revolving around the desert planet of Arrakis, also known as Dune. The novel follows the young protagonist, Paul Atreides, whose noble family becomes embroiled in a complex struggle for control over Arrakis.