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ice dune
An ice dune (also called an ice ridge or an ice foot) is a formation of ice that accumulates on the shores of many arctic beaches and is also common along the shores of the Great Lakes during the winter.〔French 2007, p. 273.〕
== Cause ==
An ice dune is produced by ice washing ashore, snowfall, and the gradual freezing of wave spray that accumulates on to the shore. They form when the air temperature is below freezing and the water temperature is near freezing.〔 Ice dunes are commonly at least tall, but the dune's size depends on the beach and the weather.〔 The tidal range, the "storminess" of the water and the topography of the beach all can affect the size of the dunes.〔French 2007 p. 276.〕 The dunes will also stop forming if the body of the water they border freezes over, which often happens on Lake Erie.〔 Ice dunes will usually break up in the early stages of spring thaw.
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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