Aerodynamic roughness of gravel surfaces
文献类型：期刊论文
| 作者 | Dong, ZB; Liu, XP; Wang, XM |
| 刊名 | GEOMORPHOLOGY
 |
| 出版日期 | 2002-02-01 |
| 卷号 | 43期号:1-2页码:17-31 |
| 关键词 | aeolian process aerodynamic roughness gravel coverage |
| ISSN号 | 0169-555X |
| 通讯作者 | Dong, ZB() |
| 英文摘要 | The interactions between surface winds and gravel surfaces that can be characterized by aerodynamic roughness length have important implications for sediment mobilization, transport, sedimentation and the development of desert pavements ('gobi' deserts). Wind tunnel results of systematic tests carried out to determine the aerodynamic roughness length of gravel surfaces of different size and coverage at a range of free-stream wind velocities are reported. The aerodynamic roughness of gravel surfaces is a function of gravel size, gravel coverage and free-stream wind velocity. The 1/30 law proposed by Bagnold, based on Nikuradse's results of water pipe flow, or taking the aerodynamic roughness length as a fixed percentage of roughness element height is not supported for gravel surfaces. The aerodynamic roughness of gravel surfaces decreases with free-stream wind velocity. The variation of aerodynamic roughness with gravel coverage can be described by quadratic curves. Maximum aerodynamic roughness length occurs at gravel coverage range above 40-75%, increasing with gravel size. Multivariate models based on free-stream wind velocity and gravel coverage have been developed for predicting the aerodynamic roughness of different gravel-sized surfaces. The maturity of the roughness effects of gravel surfaces increases with gravel coverage. In general, the roughness effects are fully developed when the gravel coverage is over 15%. (C) 2002 Elsevier Science B.V. All rights reserved. |
| 收录类别 | SCI |
| WOS关键词 | LENGTH ; VELOCITY ; FLOW |
| WOS研究方向 | Physical Geography ; Geology |
| WOS类目 | Geography, Physical ; Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000173525800002 |
| 出版者 | ELSEVIER SCIENCE BV |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2556820 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, ZB |
| 作者单位 | Chinese Acad Sci, Cold & Arid Reg Environm & Engn Res Inst, Lab Blown Sand Phys & Desert Environm, Lanzhou 730000, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, ZB,Liu, XP,Wang, XM. Aerodynamic roughness of gravel surfaces[J]. GEOMORPHOLOGY,2002,43(1-2):17-31. |
| APA | Dong, ZB,Liu, XP,&Wang, XM.(2002).Aerodynamic roughness of gravel surfaces.GEOMORPHOLOGY,43(1-2),17-31. |
| MLA | Dong, ZB,et al."Aerodynamic roughness of gravel surfaces".GEOMORPHOLOGY 43.1-2(2002):17-31. |
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来源：寒区旱区环境与工程研究所
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