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xichong

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[求助] 摘要，潤色！需要英文比較專業(yè)順溜的，謝謝！

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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1樓 2014-05-03 16:51:33

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phu_grassman

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【答案】應(yīng)助回帖

★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ ★
RXMCDM: 金幣+2 2014-05-04 00:06:31
真強(qiáng)必勝: 金幣+1, thanks 2014-05-06 14:40:20
xichong: 金幣+10, 翻譯EPI+1, 謝謝你，雖然我沒有采納，還是表示感謝！ 2014-05-06 17:26:35

Abstract:
Two sand shadow dune groups in Shigatse and Za’gya Zangbo in Tibet, respectively, and one individual dune in Da Qaidam in Qinghai were chosen as research objects in this paper. The topographies, morphologies, and physical characteristics of the sand, wind regimes, and sand transport were analyzed. These dunes, formed under harsh conditions behind hills, are mature sand shadow dunes. They are hundreds of meters long and have great linear sand dunes with significant ridges and crescent dunes downwind, and form 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 critical for the formation of such sand shadow dunes. A gap spacing of 2/3 of the hill height is most suitable for their formation. When the 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 the wind and sand, creating a “narrow-pipe effect”, which can cause the transported material to accumulate gradually in the center of the shadow zone. We observed that the following conditions are necessary for the forming of sand shadow dunes: (1) strong wind, sufficient sand, suitable obstacles, and dry climate; (2) one or both sides of the obstacle forming the shadow zone has a hill pass, which allows the passage of the wind and sand; and (3) the windward side of the obstacle has a wide and flat area, which can provide adequate spacing for the wind flow and transport of the sand material, and the leeward side also has a sufficiently broad and 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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2樓2014-05-03 20:16:41

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