Variations of horizontal and vertical velocities over two-dimensional transverse dunes: A wind tunnel simulation of the effect of windward slope
文献类型：期刊论文
| 作者 | Qian, G.; Dong, Z.; Luo, W.; Wang, H. |
| 刊名 | JOURNAL OF ARID ENVIRONMENTS
 |
| 出版日期 | 2009-12-01 |
| 卷号 | 73期号:12页码:1109-1116 |
| 关键词 | Dune dynamics Particle Image Velocimetry Transverse dune Velocity field |
| ISSN号 | 0140-1963 |
| DOI | 10.1016/j.jaridenv.2009.06.006 |
| 通讯作者 | Qian, G.(gqqian@lzb.ac.cn) |
| 英文摘要 | The changes in wind velocity induced by dune topography have an important significance in dune dynamics. In this paper, the horizontal and vertical velocities over six transverse dune models were measured non-intrusively by means of Particle Image Velocimetry in a wind tunnel. The windward slope angle and the free-stream wind velocity both affected the horizontal and vertical velocity components. On the windward side, the acceleration of horizontal velocity depended mainly on the windward slope angle and the height above the dune surface, but was also affected by the free-stream wind velocity. The speed-up ratio increased with increasing slope angle but decreased with increasing height. The ascending vertical velocities also increased with increasing slope angle and free-stream wind velocity. The Maximum values moved upper along the dune when the windward angle became steeper. in the leeward sides, the horizontal velocity decreased and reversed because of airflow separation; the maximum reverse velocity in the separation cell was about 17% of the free-stream wind velocity. Behind the dune crest, the airflow moves downwards, and its maximum downward velocity is found near the flow reattachment point. Finally, we discussed the significance of these velocity variations for sediment transport and dune dynamics. (C) 2009 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | AEOLIAN SAND TRANSPORT ; SECONDARY AIR-FLOW ; SEDIMENT TRANSPORT ; BARCHAN DUNE ; STOSS SLOPE ; LEE ; DYNAMICS ; MODEL ; PROFILES ; FLUX |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology ; Environmental Sciences |
| 语种 | 英语 |
| WOS记录号 | WOS:000269992600009 |
| 出版者 | ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556274 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Qian, G. |
| 作者单位 | Chinese Acad Sci, Key Lab Desert & Desertificat Cold & Arid Reg, Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Qian, G.,Dong, Z.,Luo, W.,et al. Variations of horizontal and vertical velocities over two-dimensional transverse dunes: A wind tunnel simulation of the effect of windward slope[J]. JOURNAL OF ARID ENVIRONMENTS,2009,73(12):1109-1116. |
| APA | Qian, G.,Dong, Z.,Luo, W.,&Wang, H..(2009).Variations of horizontal and vertical velocities over two-dimensional transverse dunes: A wind tunnel simulation of the effect of windward slope.JOURNAL OF ARID ENVIRONMENTS,73(12),1109-1116. |
| MLA | Qian, G.,et al."Variations of horizontal and vertical velocities over two-dimensional transverse dunes: A wind tunnel simulation of the effect of windward slope".JOURNAL OF ARID ENVIRONMENTS 73.12(2009):1109-1116. |
入库方式： iSwitch采集
来源：寒区旱区环境与工程研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。