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nivation : ウィキペディア英語版
nivation
Nivation is the processes that occur under a snow patch. The primary processes are mass wasting and the freeze and thaw cycle, in which fallen snow gets compacted into firn or névé. The importance of the processes covered by the term ''nivation'' with regard to the development of periglacial landscapes has been questioned by scholars, and the use of the term is discouraged.
''Nivation'' has come to include various subprocesses related to snow patches which may be immobile or semi-permanent. These sub-processes include erosion (if any) or initiation of erosion, weathering, and meltwater flow from beneath the snow patch.
Weathered particles are moved downslope by creep, solifluction and rill wash.〔 Over time, this leads to the formation of nivation hollows which, when enlarged, can be the beginnings of a cirque.〔
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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