parabolic dune

Japanese: parabolic dune(英語表記)parabolicdune
parabolic dune

... As the sand moves, the grains become rounded and polished, and often develop small, irregular holes or grooves on their surface, or an overall frosted appearance. These are good indicators for identifying aeolian sand.
[form]
Sand dunes include barchan dunes, transverse dunes, seif dunes, longitudinal dunes, parabolic dunes, star dunes, Nebkha dunes, and shadow dunes (Figure 2). When the supply of sand is relatively small, barchan dunes form, with a gentle slope on the windward side and a steep, arc-shaped slip face on the leeward side (the maximum angle of repose is 34 degrees).

*Some of the terminology that mentions "parabolic dune" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

… 砂が移動する過程で,砂粒は丸く磨かれ,またその表面に小さく不規則な孔や溝が生じたり,全体にすりガラス状になるなどの表面の特徴を呈することが多く,風成砂を見分けるとき,よい示標となる。
[形態]
 砂丘の形態には,バルハン砂丘barchan dune,横砂丘transverse dune,縦砂丘seif dune,longitudinal dune,パラボラ砂丘parabolic dune,星形砂丘star dune,ネブカ砂丘Nebkha,shadow duneなどがある(図2)。 砂の供給が比較的少ない場合,風上側に緩やかな斜面,風下側に弧状をなす急斜面slip face(その最大安息角は34度)をもつバルハン砂丘が生じる。…

※「parabolic dune」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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