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xichong新虫 (小有名气)
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[求助]
摘要，润色！需要英文比较专业顺溜的，谢谢！
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| Abstract: By taking two sand shadow dune groups in Shigatse and Za’gya Zangbo in Tibet and one individual dune in Da Qaidam in Qinghai as research objects, this paper analyzes their topographies, and morphologies, and the physical characteristics of the sand, wind regimes, and sand transport. These dunes, formed under harsh conditions behind hills, are mature sand shadow dunes, which are hundreds of meters long, have great linear sand dunes with significant ridges and crescent dunes downwind, and formed behind hills. Additionally they are formed under harsh conditions, with a hill pass on one or both sides. According to wind tunnel experiments, the hill gap and wind velocity are important for the formation of such sand shadow dunes. Only when the gap spacing is 2/3 the hill height, it is most suitable for their formation. When wind velocity is 20 m/s, the sand body will be divided into two parts, which will form the sand shadow dunes behind the hill body. The hill pass allows the transport of wind and sand, creating a “narrow-pipe effect”, which causes the transported material to accumulate gradually in the center of the shadow zone. We observed that the following conditions are necessary for sand shadow dunes to form: (1) strong winds, sufficient sand, suitable obstacles, and a dry climate; (2) one or both sides of the obstacle forming the shadow zone has a hill pass, which allows the passage of wind and sand; and (3) the windward side of the obstacle has a wide, flat area, which provides adequate spacing for the wind flow and transport of sand material, and the leeward side also has a sufficiently broad, flat area to allow the release of the wind and transported sand. Research on these dunes, newly discovered on the Tibetan Plateau, could greatly contribute to the understanding of dune geomorphology. |
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phu_grassman
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快乐岛、布吉岛岛主
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RXMCDM: 金币+2 2014-05-04 00:06:31
真强必胜: 金币+1, thanks 2014-05-06 14:40:20
xichong: 金币+10, 翻译EPI+1, 谢谢你，虽然我没有采纳，还是表示感谢！ 2014-05-06 17:26:35
RXMCDM: 金币+2 2014-05-04 00:06:31
真强必胜: 金币+1, thanks 2014-05-06 14:40:20
xichong: 金币+10, 翻译EPI+1, 谢谢你，虽然我没有采纳，还是表示感谢！ 2014-05-06 17:26:35