These small transverse dunes formed on a beach at Castlepoint

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These small transverse dunes formed on a beach at Castlepoint

These small transverse dunes formed on a beach at Castlepoint, New Zealand within 30 minutes of a strong wind developing.

This image is linked to the following Scitable pages:

Coastal Dunes: Aeolian Transport

Coastal dunes are a ridge, or a series of ridges, that form at the rear of a beach and differ from most other constructional coastal landforms in that they are formed by the movement of air (aeolian transport) rather than by tidal, wave, or current action. Initiation of aeolian transportation is controlled by wind velocity, the characteristics of sediments, beach morphology, moisture content, and the degree of roughness elements present (e.g., driftwood and vegetation). The movement of sediment into the back beach environment often results in the formation of coastal dunes.