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DOI | 10.1016/j.geomorph.2021.107699 |
Field measurements of crestal flow direction and turbulent flow over two transverse dune ridges | |
Zhang, Zhengcai; Dong, Zhibao | |
通讯作者 | Zhang, ZC (通讯作者),Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, 260 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China. |
发表日期 | 2021 |
ISSN | 0169-555X |
EISSN | 1872-695X |
卷号 | 383 |
英文摘要 | Turbulent airflow is a fundamental factor that controls the geomorphology of sand dune systems, especially dune expansion and sandy desertification. However, little is known about turbulent air flow in dune systems, and this limits efforts to control dune expansion and sandy desertification. To obtain some of the missing information, we calculated the turbulent airflow characteristics over a transverse dune in the Tengger Desert in southeastern China. We found that the angle of airflow at the dune crest controls flow angles at middle of the dune's stoss slope and at the toe of the leeward slope, and also controls the turbulent flow characteristics over the dune surface. The critical wind direction was from the NW (wind directions ranged from 355 degrees to 45 degrees to the crest perpendicular line [CPL]) and SE (wind directions ranged from 65 degrees to 165 degrees with respect to the CPL), and about 20 degrees and 25 degrees with respect to the CPL for northwesterly winds and southeasterly winds, respectively. The kinematic Reynolds' stress (RSk), streamwise turbulence intensity (CVu), and total kinetic energy (TKE) were largest close to the critical wind direction for winds from the NW, indicating that dune movement was mainly controlled by the critical wind direction. However, TKE, RSk, and CVu differed between southeast and northwest winds; for southeasterly winds, they were largest for wind directions from 65 degrees to 115 degrees with respect to the CPL and similar to the values for wind directions from 115 degrees to 165 degrees with respect to the CPL, indicating asymmetrical sand movement. We conclude that, for closely spaced transverse dunes, sand transport is controlled by the critical wind directions; this indicates that efficient control of sand movement and sandy desertification will benefit from sand-control structures that block airflow from the critical wind directions. (C) 2021 Elsevier B.V. All rights reserved. |
关键词 | SECONDARY AIR-FLOWPRINCE-EDWARD-ISLANDSEDIMENT TRANSPORTGREENWICH DUNESFOREDUNEWINDDYNAMICSLEEMODELGEOMORPHOLOGY |
英文关键词 | Turbulence; Critical wind direction; Inter-dune area; Transverse dune |
语种 | 英语 |
WOS研究方向 | Physical Geography ; Geology |
WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
WOS记录号 | WOS:000640909900005 |
来源期刊 | GEOMORPHOLOGY
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来源机构 | 中国科学院西北生态环境资源研究院 |
文献类型 | 期刊论文 |
条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/253646 |
作者单位 | [Zhang, Zhengcai] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China; [Dong, Zhibao] Shaanxi Normal Univ, Sch Geog & Tourism, Xian, Shanxi, Peoples R China |
推荐引用方式 GB/T 7714 | Zhang, Zhengcai,Dong, Zhibao. Field measurements of crestal flow direction and turbulent flow over two transverse dune ridges[J]. 中国科学院西北生态环境资源研究院,2021,383. |
APA | Zhang, Zhengcai,&Dong, Zhibao.(2021).Field measurements of crestal flow direction and turbulent flow over two transverse dune ridges.GEOMORPHOLOGY,383. |
MLA | Zhang, Zhengcai,et al."Field measurements of crestal flow direction and turbulent flow over two transverse dune ridges".GEOMORPHOLOGY 383(2021). |
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