| definition |
- 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.
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| Abstract from DBPedia | A yardang is a streamlined protuberance carved from bedrock or any consolidated or semiconsolidated material by the dual action of wind abrasion by dust and sand and deflation (the removal of loose material by wind turbulence.) Yardangs become elongated features typically three or more times longer than 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 pattern of yardangs is therefore a combination of the original rock distribution, and the fluid mechanics of the air flow and resulting pattern of erosion.ヤルダン（もともとはテュルク系の言葉で、英語: Yardang、中国語: 雅丹地貌）またはヤルダン地形とは風、雨などによって地面の柔らかい部分が侵食されて、堅い岩部分が小山または堆積物のように数多く残る乾燥帯を指し、中央アジアなどによくみられる地形である。 中国の甘粛省敦煌市には敦煌ヤルダン国家地質公園がある。 (Source: http://dbpedia.org/resource/Yardang) |
