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- Icefall abstract "An icefall is a portion of some glaciers characterized by rapid flow and a chaotic crevassed surface. Perhaps the most conspicuous consequence of glacier flow, icefalls occur where the glacier bed steepens and/or narrows. The term icefall is formed by analogy with the word waterfall, a similar, but much higher speed, flow phenomenon.Most glacier ice flows at speeds of a few hundred metres per year or less. However, the flow of ice in an icefall may be measured in kilometres per year. Such rapid flow cannot be accommodated by plastic deformation of the ice. Instead, the ice fractures forming crevasses. Intersecting fractures form ice columns or seracs. These processes are imperceptible for the most part; however, a serac may collapse or topple abruptly and without warning. This behavior often poses the biggest risk to mountaineers climbing in an icefall.Below the icefall, the glacier bed flattens and/or widens and the ice flow slows. Crevasses close and the glacier surface becomes much smoother and easier to traverse.Icefalls vary greatly in height. The Roosevelt Glacier icefall, on the north face of Mount Baker (Cascade Range, U.S.), is about 730 metres (2,400 ft) high (photograph at right). The ice cliff of the left side of the ice fall and above the debris covering the glacier is 20 to 40 metres (70 to 140 ft) high. Typical of mountain glaciers, this icefall forms as the ice flows from a high elevation plateau or basin accumulation zone to a lower valley ablation zone. Much larger icefalls may be found in the outlet glaciers of continental ice sheets. The icefall feeding the Lambert Glacier in Antarctica (photograph at left) is 7 kilometres (4.4 mi) wide and 14 kilometres (9 mi) long, even though the elevation difference is only 400 metres (1,300 ft), a little more than half that of the Roosevelt Glacier icefall.Icefalls are climbed because of their beauty and the challenge they pose. In some cases, an icefall may provide the only feasible or the easiest route up one face of a mountain. An example is the Khumbu Icefall on the Nepalese side of Mount Everest, variously described as "treacherous" and "dangerous." It is about 5,500 metres (18,000 ft) above sea level.".
- Icefall thumbnail Roosevelt_Glacier_6940.JPG?width=300.
- Icefall wikiPageID "1463439".
- Icefall wikiPageRevisionID "605614059".
- Icefall hasPhotoCollection Icefall.
- Icefall subject Category:Bodies_of_ice.
- Icefall subject Category:Icefalls.
- Icefall subject Category:Mountaineering.
- Icefall comment "An icefall is a portion of some glaciers characterized by rapid flow and a chaotic crevassed surface. Perhaps the most conspicuous consequence of glacier flow, icefalls occur where the glacier bed steepens and/or narrows. The term icefall is formed by analogy with the word waterfall, a similar, but much higher speed, flow phenomenon.Most glacier ice flows at speeds of a few hundred metres per year or less. However, the flow of ice in an icefall may be measured in kilometres per year.".
- Icefall label "Cascada de hielo".
- Icefall label "Cascata de gelo".
- Icefall label "Cascata di ghiaccio".
- Icefall label "Eisbruch".
- Icefall label "Icefall".
- Icefall label "Lodospad".
- Icefall label "Ледопад".
- Icefall label "アイスフォール".
- Icefall sameAs Eisbruch.
- Icefall sameAs Cascada_de_hielo.
- Icefall sameAs Cascata_di_ghiaccio.
- Icefall sameAs アイスフォール.
- Icefall sameAs Lodospad.
- Icefall sameAs Cascata_de_gelo.
- Icefall sameAs m.053k1l.
- Icefall sameAs Q1310961.
- Icefall sameAs Q1310961.
- Icefall wasDerivedFrom Icefall?oldid=605614059.
- Icefall depiction Roosevelt_Glacier_6940.JPG.
- Icefall isPrimaryTopicOf Icefall.
