Giant current ripples

They are active channel topographic forms up to 20 m high, which occur within near-thalweg areas of the main outflow routes created by glacial lake outburst floods.

[7] While they are often called ripples, their topography responds to hydraulic flow as well as boundary conditions, which means they are more accurately described as a type of dune.

[10][11][12][13] Giant current ripples have also been identified in the Yukon Territory, Canada, where they resulted from a 30 cubic kilometres (7.2 cu mi) outburst from Neoglacial Lake Alsek.

[14] American and British geologists and planetologists have discovered giant current ripple reliefs and other scabland features on Mars surrounding the Cerberus Fossae, indicating that megafloods have occurred there at some point in the recent past.

[15] While they have roughly the same dimensions as on earth when they occur, Giant current ripples appear to be much less common on Mars relative to other scabland features.

Giant ripples in the Chuya basin (Altai Mountains), one of the largest scablands on earth
Several common ripple shapes. Giant current ripples usually exhibit antidune breaking wave and dune ripple shapes, resulting from their high energy environments.
Giant current ripples along the Columbia River
3-D Anaglyph of Giant Current Ripples in Athabasca Valles , Mars