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Foredune
A foredune is a dune ridge that runs parallel to the shore of an ocean, lake, bay, or estuary. Foredunes consist of sand deposited by wind on a vegetated part of the shore. Foredunes can be classified generally as ''incipient'' or ''established''.
Foredunes may begin as ''shadow dunes'' that form in the wind shadows of clumps of vegetation.〔(【引用サイトリンク】url=http://www.calvin.edu/academic/geology/coastaldunes/dunes/foredunes2.htm )〕 Several shadow dunes may eventually join to form an incipient foredune.〔(【引用サイトリンク】url=http://www.calvin.edu/academic/geology/coastaldunes/dunes/foredunes1.htm )〕 When an incipient foredune reaches a height of about , it has a significant wind shadow of its own. Wind-blown sand will tend to fall on this incipient dune rather than traveling further inland. When a foredune becomes high, it may trap all of the wind-blown sand from the beach.〔(【引用サイトリンク】url=http://www.calvin.edu/academic/geology/coastaldunes/dunes/foredunes4.htm )〕
In active dune systems, the foredunes appear closest to the sea or other body of water. However, some dune systems, such as those on eroding coasts, do not have foredunes. In those systems, other kinds of dunes may be closest to the water.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Foredune」の詳細全文を読む
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