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日中韓辭典研究所

yardang

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Wiktionary英語版

出典:Wiktionary

yardang

Dunhuang Yardang National Geopark

語源

From yardan, ablative of Turkish yar ("cliff", "precipice").

名詞

yardang (複数形 yardangs)

  1. A large wind-eroded mass of soft or poorly consolidated rock in a desert region which lies parallel to the prevailing winds, often with an unusual shape.

参考

アナグラム

  • Nygaard

ウィキペディア英語版

出典:Wikipedia

Yardang

出典:『Wikipedia』 (2011/07/19 13:55 UTC 版)

英語による解説

ウィキペディア英語版からの引用
引用

A yardang is a streamlined hill carved from bedrock or any consolidated or semiconsolidated material by the dual action of wind abrasion, dust and sand, and deflation. Yardangs are elongate features typically three or more times longer than they are wide, and when viewed from above, resemble the hull of a boat. Facing the wind is a steep, blunt face that gradually gets lower and narrower toward the lee end. Yardangs are formed by wind erosion, typically of an originally flat surface formed from areas of harder and softer material. The soft material is eroded and removed by the wind, and the harder material remains. The resulting patter of yardangs is therefore a combination of the original rock distribution, and the fluid mechanics of the air flow and resulting pattern of erosion.

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