A sand wave is a lower regime sedimentary structure that forms across from tidal currents. [1]
Sand waves are formed through the action of the wind or water (through waves or tidal currents) [2] and are a product of unidirectional flow. Sand waves are the result of a mean flow velocity between 40 and 70 cm/s.
Sand waves also form underwater. [3] [4]
Sand wave formed by winds.
Media related to Sand waves at Wikimedia Commons