| The dynamic characteristics and migration of a pyramid dune | |
| Wang, T; Zhang, WM; Dong, ZB; Qu, JJ; Jing, F; Wang, WF; Feng, JM | |
| 刊名 | SEDIMENTOLOGY
 |
| 2005-06-01 | |
| 卷号 | 52期号:3页码:429-440 |
| 关键词 | dynamic characteristics Mogao Grottoes monitoring migration photogrammetry pyramid dunes sedimentary structures |
| ISSN号 | 0037-0746 |
| DOI | 10.1111/j.1365-3091.2005.00696.x |
| 通讯作者 | Wang, T(weiminzh@ns.lzb.ac.cn) |
| 英文摘要 | The results of wind tunnel experiments and field observations show that when the intersection angle between airflow direction and dune crest (ridge) line is > 30 degrees, a reverse vortex is formed. Because of the convergence of sand streams from the windward and lee slopes at the crest, sand accumulates in the crestal region, causing vertical growth. Nevertheless, studies also show that the common asymmetry of the two slopes of a dune may significantly influence the evolution of arms of a pyramid dune. The migration rates of pyramid dunes are mediated by the interplay of their arms moving transversely and the vertical growth in response to the variations in wind regimes. Comparing the effects of airflow transverse to a given arm with longitudinal airflow, it is indicated that the transverse airflow is more significant in controlling the arms of pyramid dunes. The whole body of the studied pyramid dune, particularly the upper quarter section, migrated SE direction during the monitoring period. The patterns of wind erosion and deposition change alternately with seasonal variations in wind directions. The W, NE and SE sides undergo constant erosion, deposition and both erosion and deposition, respectively. The results of long-term monitoring of a pyramid dune show that southerly winds, resulting from a local circulation, markedly affect the transverse migration of the whole pyramid dune. |
| 收录类别 | SCI |
| WOS关键词 | STAR DUNES ; FIELD |
| WOS研究方向 | Geology |
| WOS类目 | Geology |
| 语种 | 英语 |
| 出版者 | BLACKWELL PUBLISHING LTD |
| WOS记录号 | WOS:000229189600001 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2555686 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Wang, T |
| 作者单位 | Chinese Acad Sci, Kay Lab Desert & Desertificat, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang, T,Zhang, WM,Dong, ZB,et al. The dynamic characteristics and migration of a pyramid dune[J]. SEDIMENTOLOGY,2005,52(3):429-440. |
| APA | Wang, T.,Zhang, WM.,Dong, ZB.,Qu, JJ.,Jing, F.,...&Feng, JM.(2005).The dynamic characteristics and migration of a pyramid dune.SEDIMENTOLOGY,52(3),429-440. |
| MLA | Wang, T,et al."The dynamic characteristics and migration of a pyramid dune".SEDIMENTOLOGY 52.3(2005):429-440. |
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