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Giant current ripples (GCRs), also known as giant gravel bars or giant gravel dunes, [1] are a form of subaqueous dune. 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 . [ 2 ]
Giant current ripples, (gravel wave trains, gravel dunes and antidunes) up to 18 meters high and 225 meters in wavelength were created in several locations along the lake bottom. They are best developed just east of the Tyetyo River in the eastern part of the Kuray Basin, but several other smaller fields of giant current ripples also occur there.
Current ripple marks, unidirectional ripples, or asymmetrical ripple marks are asymmetrical in profile, with a gentle up-current slope and a steeper down-current slope. The down-current slope is the angle of repose, which depends on the shape of the sediment.
The giant current ripples of the Camas prairie are analogous to similar giant Pleistocene bedforms described form Channeled Scablands of Washington. They are identical to the giant subaqueous bedrooms that formed on the bottom of Lake Kuray-Chuya during the Altai flood in Siberia, Russia.
There are also immense potholes and ripple marks, much larger than those found on ordinary rivers. When these features were first studied, no known theories could explain their origin. The giant current ripples are between 3 and 49 feet (1 and 15 m) high and are regularly spaced, relatively uniform hills. [9]
They are often associated with giant current ripples. [1] [2] Malde [3] introduced this to refer to streamlined mounds of gravel deposited by the Bonneville Flood that lie downstream of bedrock projections on the scoured valley floor of the Snake River. They are most common type of bar found within the Channeled Scablands created by the ...
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Giant current ripples – Depositional forms in channeled scablands; Glacial lake outburst flood – Type of outburst flood that occurs when the dam containing a glacial lake fails; Bonneville flood – Catastrophic flooding event in the last ice age; Ice Age Floods National Geologic Trail – Network of routes connecting natural sites