The world's slowest whirlpool: Bizarre footage shows 50ft ice disk spinning unaided in freezing Russian waters



by Charlie Moor
Mailonline

Video filmed in Omsk Oblast captured an amazing and rare phenomenon
Ice disk formed at a bend in the 100ft-wide river which was still and calm
Phenomenon occurs when some but not all of river water is frozen solid
Accelerating water creates a force called 'rotational shear' which twists ice


This bizarre footage shows a 50ft ice disk slowly spinning around in a freezing Russian river.

The video, filmed in Omsk Oblast, captured an amazing and rare phenomenon where disks of frozen water can build up in rivers and rotate.

Eerie: The disk formed at a bend in the 100ft-wide river which was otherwise totally still and calm

The disk formed at a bend in the 100ft-wide river which was otherwise totally still and calm.

Some of the river was frozen and covered in snow, as snow-coated trees lined the banks to provide a stunning backdrop for the rare occurrence.

The disk can be seen rotating slowly in a clockwise direction while staying totally still in terms of its position in the water.


Ice disks in slow-moving water in cold climates have been known to reach up to 50ft in diameter.

Strange: The video, filmed in Omsk Oblast, captured an amazing and rare phenomenon where disks of frozen water can build up in rivers and rotate
WHAT MADE THE ICE DISK FORM AND SPIN AROUND?

One theory is that cold, dense air turned the river water into ice, but since the water was relatively warm it didn't happen all at once.

Floating bits of ice got caught and started to spin in a circle.

Normally the disks occur at bends in the river where the accelerating water creates a force called 'rotational shear', which breaks off a chunk of ice and twists it around.

As the disc rotates, it grinds against surrounding ice - smoothing into a perfect circle.

The phenomenon is known in the Arctic, Scandanavia and Canada, but is very rare elsewhere.
Pretty: Some of the river was frozen and covered in snow, as snow-coated trees lined the banks to provide a stunning backdrop for the rare occurrence


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