| Influence of the gap ratio on variations in the surface shear stress and on sand accumulation in the lee of two side-by-side obstacles | |
| Luo, Wanyin; Lu, Junfeng; Qian, Guangqiang; Dong, Zhibao | |
| 刊名 | ENVIRONMENTAL EARTH SCIENCES
 |
| 2016-05-01 | |
| 卷号 | 75期号:9页码:12 |
| 关键词 | Sand drifts Gap ratio Surface shear stress Dune dynamics Wind tunnel simulation |
| ISSN号 | 1866-6280 |
| DOI | 10.1007/s12665-016-5588-3 |
| 通讯作者 | Luo, Wanyin(wyluo@lzb.ac.cn) |
| 英文摘要 | Changes in the surface shear stress in the lee of two side-by-side obstacles result in sand deposition and the development of aeolian sand drifts. Through direct wind tunnel measurements using Irwin-type sensors, surface shear stress behind two side-by-side obstacles separated by gaps with different gap ratios (the ratio of the gap spacing between the obstacles to the center-to-center distance for the obstacles) was measured. Particular attention to the effects of the spacing between the two obstacles on the initiation of sand drifts has been paid. The results showed that the gap ratio was the key factor that determined the shear stress patterns. Wind speed increased through the gap, but decreased a short distance downwind, causing higher peak skin-friction velocities and higher shear stress immediately behind the obstacles, producing a range of sand deposition patterns in the sheltered lee side of the obstacles. Comparison of plots of surface shear stress and isoline plots of psi (for the fraction of the total time in which a given threshold skin-friction velocity was exceeded) with the sand deposition patterns confirmed that sand drift may form in the lee of a gap between two adjacent obstacles when the gap ratio g* <= 0.44, and it may disappeared when the gap ratio larger than this value. |
| 收录类别 | SCI |
| WOS关键词 | ATMOSPHERIC INERTIAL SUBLAYER ; WIND-TUNNEL SIMULATION ; SALTATION THRESHOLD ; ROUGHNESS ELEMENTS ; FLOW PATTERNS ; LARGE PATCHES ; TRANSPORT ; DUNES ; SLOPE ; DRAG |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
| WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000376030100043 |
| 内容类型 | 期刊论文 |
| URI标识 | http://www.corc.org.cn/handle/1471x/2557338 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Luo, Wanyin |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Key Lab Desert & Desertificat, 320 West Donggang Rd, Lanzhou 730000, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Luo, Wanyin,Lu, Junfeng,Qian, Guangqiang,et al. Influence of the gap ratio on variations in the surface shear stress and on sand accumulation in the lee of two side-by-side obstacles[J]. ENVIRONMENTAL EARTH SCIENCES,2016,75(9):12. |
| APA | Luo, Wanyin,Lu, Junfeng,Qian, Guangqiang,&Dong, Zhibao.(2016).Influence of the gap ratio on variations in the surface shear stress and on sand accumulation in the lee of two side-by-side obstacles.ENVIRONMENTAL EARTH SCIENCES,75(9),12. |
| MLA | Luo, Wanyin,et al."Influence of the gap ratio on variations in the surface shear stress and on sand accumulation in the lee of two side-by-side obstacles".ENVIRONMENTAL EARTH SCIENCES 75.9(2016):12. |
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