Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel
文献类型：期刊论文
| 作者 | Dong, Zhibao1,2; Qinan, Guangqiang2; Lu, Ping2; Luo, Wanyin2; Wang, Hongtao2 |
| 刊名 | EARTH SURFACE PROCESSES AND LANDFORMS
 |
| 出版日期 | 2009-02-01 |
| 卷号 | 34期号:2页码:204-216 |
| 关键词 | Dune dynamics secondary airflow turbulence structures |
| ISSN号 | 0197-9337 |
| DOI | 10.1002/esp.1704 |
| 通讯作者 | Dong, Zhibao(zbdong@lzb.ac.cn) |
| 英文摘要 | The turbulence field of airflow in the lee of a dune has significant impacts on dune dynamics and related processes. We used particle image velocimetry in a wind tunnel simulation to obtain detailed velocity measurements in the lee of two-dimensional transverse dune models, then used the results to analyse their turbulence fields. The dune models used in this study had a single lee angle of 30 degrees, and a total of six stoss angles: 3 degrees, 5 degrees, 10 degrees, 15 degrees, 20 degrees and 25 degrees. We used vorticity, turbulence intensity, Reynolds stress and turbulent kinetic energy to characterize the turbulence fields. These parameters were functions of stoss angle, wind velocity, distance from the dune crest and height above the ground surface. The stoss angles could generally be divided into two groups based on the profiles of mean velocity, turbulence and Reynolds stress. Stoss angles of 3 degrees and 5 degrees usually had similar profiles, and angles of 15 degrees, 20 degrees and 25 degrees formed a second group with similar profiles. The profiles for the stoss angle of 10 degrees were usually transitional and were intermediate between the two groups. Vorticity, Reynolds stress and turbulent kinetic energy increased monotonically with increasing free-stream wind velocity, but their variations with respect to the stoss angle were complex. The stoss angles of 15 degrees and 20 degrees had the maximum values of these three parameters, thus these angles may have special significance in dune development given the characteristics of the mean velocity fields and turbulence fields they produce within the lee airflow. It is the streamwise velocity component and its turbulence that determine the surface shear stress. Copyright (C) 2008 John Wiley & Sons, Ltd. |
| 收录类别 | SCI |
| WOS关键词 | DESERT SAND DUNES ; SECONDARY AIR-FLOW ; SEDIMENT TRANSPORT ; STOSS SLOPE ; UNSTEADY WINDS ; AEOLIAN DUNES ; SILVER PEAK ; VELOCITY ; MODEL ; DYNAMICS |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000263402100004 |
| 出版者 | JOHN WILEY & SONS LTD |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556276 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, Zhibao |
| 作者单位 | 1.Shaanxi Normal Univ, Dept Geog, Xian 710062, Shaanxi Prov, Peoples R China 2.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Zhibao,Qinan, Guangqiang,Lu, Ping,et al. Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2009,34(2):204-216. |
| APA | Dong, Zhibao,Qinan, Guangqiang,Lu, Ping,Luo, Wanyin,&Wang, Hongtao.(2009).Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel.EARTH SURFACE PROCESSES AND LANDFORMS,34(2),204-216. |
| MLA | Dong, Zhibao,et al."Turbulence fields in the lee of two-dimensional transverse dunes simulated in a wind tunnel".EARTH SURFACE PROCESSES AND LANDFORMS 34.2(2009):204-216. |
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来源：寒区旱区环境与工程研究所
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