Frazil Ice


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frazil ice

[′fra·zəl ‚īs]
(hydrology)
A spongy or slushy accumulation of frazil in a body of water. Also known as needle ice.

Frazil Ice

 

an accumulation of loose, spongy ice within a body of water (deep frazil ice) or on its surface (surface frazil ice). Frazil ice forms from tiny crystals of deep ice (intermediate and bottom ice) and from grease ice and slush. It occurs before the freeze-up when water is supercooled below 0°C, primarily on mountain rivers and rivers with rapids, below polynyas and the lower pools of hydroengineering complexes, and, occasionally, on lowland rivers and lakes.

Frazil ice, carried downstream by the current, covers large areas and dams up the channel, causing ice jams. It also considerably impedes the operation of hydroengineering structures by clogging up the filters of water intakes and the aperture grills at hydroelectrical power plants.

References in periodicals archive ?
Alternatively, ice may nucleate on, or frazil ice may attach to, benthic structures (i.
If the water is flowing during this nucleation, the resulting frazil ice may adhere to epibenthic organisms, collecting on exposed surfaces or drifting alongside and underneath.
Evolution of frazil ice in natural bodies of water.
The emergency occurred when slush, known as frazil ice, plugged up the Millers River and diverted the water flow down Pequoig Avenue, through backyards and into Cass Meadow.
37 (1) snow-ice in the lakes, snow-ice or frazil ice in the river; (2) wet snow and lower 12 cm slush, 0.
The interface between the near-fresh upper water and underlying seawater is a potential site of frazil ice production, owing to the different freezing temperatures of the two water masses.
Thus, on a shallow coastal shelf, where storm-induced turbulence has produced an initial suspension of fine-grained bottom sediments, "suspension freezing" and the formation of a seawater-slush layer of frazil ice can entrain high concentrations of fine-grained sediment.
Flume studies and field observations of the interaction of frazil ice and anchor ice with sediments.