Kolk (vortex)
Underwater vortex / From Wikipedia, the free encyclopedia
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A kolk is a scour hole created by an underwater vortex caused by rapidly rushing water passing an underwater obstacle in boundary areas of high shear. High-velocity gradients produce a violently rotating column of water, similar to a tornado. Kolks can pluck multiple-ton blocks of rock and transport them in suspension for thousands of metres.[1][2]
Kolks leave clear evidence in the form of plucked-bedrock pits, called rock-cut basins or kolk lakes and downstream deposits of gravel-supported blocks that show percussion but no rounding.[1]