Characterizing the height profile of the flux of wind-eroded sediment
文献类型：期刊论文
| 作者 | Dong, Zhibao; Qian, Guangqiang |
| 刊名 | ENVIRONMENTAL GEOLOGY
 |
| 出版日期 | 2007 |
| 卷号 | 51期号:5页码:835-845 |
| 关键词 | wind-eroded flux exponential-decay function creep proportion relative decay rate average saltation height |
| ISSN号 | 0943-0105 |
| DOI | 10.1007/s00254-006-0363-5 |
| 通讯作者 | Dong, Zhibao(zbdong@lzb.ac.cn) |
| 英文摘要 | Wind erosion causes severe environmental problems, such as aeolian desertification and dust storms, in arid and semiarid regions. Reliable prediction of the height profile of the wind-eroded sediment flux is crucial for estimation of transport rates, verification of computer models, understanding of particle-modified wind flows, and control of drifting sand. This study defined the basic height profile for the flux of wind-eroded sediment and the coefficients that characterize its equation. Nine grain-size populations of natural sand at different wind velocities were tested in a wind tunnel to measure the flux of sediment at different heights. The resulting flux profiles resemble a golf club with a small back-turn where the flux increases with increasing height within 20 mm above the surface. If the small back-turns are neglected, the flux profiles can be expressed by an exponential-decay function q(r)(z) = ae(-bZr) where q (r)(z) is the dimensionless relative flux of sediment at height z, which follows the exponential-decay law proposed by previous researchers for aeolian saltation. Three coefficients (a creep proportion, a relative decay rate, and an average saltation height) are proposed to characterize the height profile. Coefficients a and b in the above equation represent the creep proportion and relative decay rate as a function of height, respectively. Coefficient a varies widely, depending on grain size and wind velocity, but averages 0.09. It is suggested that the grain size and wind velocity must be specified when discussing creep proportion. Coefficients a and b are nearly linearly correlated and decrease as grain size and wind velocity increase. The average saltation height (the average height sediment particles can reach) was a function of grain size and wind velocity, and was well correlated with coefficients a and b. |
| 收录类别 | ISTP ; SCI |
| WOS关键词 | BLOWING SAND CLOUD ; VERTICAL-DISTRIBUTION ; DUST STORMS ; EOLIAN SALTATION ; MASS FLUX ; FIELD ; TUNNEL ; TRANSPORT ; MOVEMENT ; EROSION |
| WOS研究方向 | Environmental Sciences & Ecology ; Geology ; Water Resources |
| WOS类目 | Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000243033300025 |
| 出版者 | SPRINGER |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2555980 |
| 专题 | 寒区旱区环境与工程研究所 |
| 通讯作者 | Dong, Zhibao |
| 作者单位 | Chinese Acad Sci, Key Lab Desert & Desertificat, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China |
| 推荐引用方式 GB/T 7714 | Dong, Zhibao,Qian, Guangqiang. Characterizing the height profile of the flux of wind-eroded sediment[J]. ENVIRONMENTAL GEOLOGY,2007,51(5):835-845. |
| APA | Dong, Zhibao,&Qian, Guangqiang.(2007).Characterizing the height profile of the flux of wind-eroded sediment.ENVIRONMENTAL GEOLOGY,51(5),835-845. |
| MLA | Dong, Zhibao,et al."Characterizing the height profile of the flux of wind-eroded sediment".ENVIRONMENTAL GEOLOGY 51.5(2007):835-845. |
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来源：寒区旱区环境与工程研究所
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