Sedimentary structures

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Sedimentary structures are those structures formed from sediment. There are two kinds of flow regimes, which at varying speeds and velocities produce different structures. In the lower flow regime, the natural progression is from a flat bed, to some sediment movement (saltation etc.), to ripples, to slightly larger dunes. Dunes have a vortex in the lee side of the dune. As the upper flow regime forms, the dunes become flattened out, and then produce antidunes. At higher still velocity, the antidunes are flattened.

[edit] See also

• Reynolds number
• Froude number
• Stream power