ANCHOR ICE & ICE RAFTED PEBBLES, LARAMIE RIVER

Provided by Edward Kempema, University of Wyoming

Total Time = 0:41 (4.2 Mb)

In streams and other turbulent water bodies the water can supercool (i.e. cool below the freezing point). When this occurs, frazil forms in the water column and anchor ice may form on the stream bed. Formation of anchor ice and its subsequent release from the bed results in sediment transport by the released anchor ice (i.e. ice rafting). This movie is a compilation from many movies found at Ed Kempema's web site (see below). The sequence show anchor ice forming on the channel bed, increased bouyancy as ice masses grow, release of ice mass as water warms up during day light, and transport of pebbles downstream. The last part of the video shows one rather large clast (cobble-boulder) in transport.

For a full explanation, more movies and additional information go to: http://faculty.gg.uwyo.edu/kempema/vidtour.html

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