Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/sed.12171 |
Air density effects on aeolian sand movement: Implications for sediment transport and sand control in regions with extreme altitudes or temperatures | |
Han, Qingjie1; Qu, Jianjun1,2; Dong, Zhibao1; Zhang, Kecun1; Zu, Ruiping1 | |
通讯作者 | Han, Qingjie |
来源期刊 | SEDIMENTOLOGY |
ISSN | 0037-0746 |
EISSN | 1365-3091 |
出版年 | 2015 |
卷号 | 62期号:4页码:1024-1038 |
英文摘要 | Aeolian sand transport results from interactions between the ground surface and airflow. Previous research has focused on the effects on sand entrainment and mass transport of surface features and wind velocity, but the influence of air density, which strongly constrains airflow characteristics and the resulting sand flow, has not been widely considered. In the present study, entrainment, saltation characteristics and transport rates were examined at nine experimental sites ranging in elevation from -154m below sea-level (Aiding Lake) to 5076m above sea-level (Tanggula Mountain pass on the Qinghai-Tibetan plateau). At each site, a portable wind tunnel and high-speed camera system were set up, and the friction wind velocity, threshold friction velocity and sand flow structure were observed systematically. For a given volumetric airflow, lower air density increases the wind velocity. Low air density also creates a high threshold friction velocity. The Bagnold wind erosion threshold model remains valid, but the value of empirical parameter A decreased with decreasing air density and ranged from 010 to 007, the smallest values reported in the literature. For a given wind velocity, increased altitude reduced total sand transport and creeping, but the saltation rate and saltation height increased. The present results provide insights into the fundamental mechanisms of the initiation and transport of sand by wind in regions with an extreme temperature or altitude (for example, alpine deserts and low-lying lake basins) or on other planets, including Mars. These results also provide theoretical support for improved sand-control engineering measures. The data and empirical equations provided in this paper improve the ability to estimate threshold and transport conditions for wind-blown sand. |
英文关键词 | Aeolian sand transport air density altitude flux profile Qinghai-Tibet Railway temperature threshold wind velocity |
类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
收录类别 | SCI-E |
WOS记录号 | WOS:000354564200003 |
WOS关键词 | SALTATION THRESHOLD ; SURFACE-ROUGHNESS ; WIND EROSION ; MARS ; FIELD ; DUST ; EARTH ; ENTRAINMENT ; SIMULATIONS ; ENVIRONMENT |
WOS类目 | Geology |
WOS研究方向 | Geology |
来源机构 | 中国科学院西北生态环境资源研究院 |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/190435 |
作者单位 | 1.Chinese Acad Sci, CAREERI, Key Lab Desert & Desertificat, Lanzhou 730000, Gansu, Peoples R China; 2.Chinese Acad Sci, Dunhuang Gobi & Desert Ecol & Environm Res Stn, CAREERI, Dunhuang, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Han, Qingjie,Qu, Jianjun,Dong, Zhibao,et al. Air density effects on aeolian sand movement: Implications for sediment transport and sand control in regions with extreme altitudes or temperatures[J]. 中国科学院西北生态环境资源研究院,2015,62(4):1024-1038. |
APA | Han, Qingjie,Qu, Jianjun,Dong, Zhibao,Zhang, Kecun,&Zu, Ruiping.(2015).Air density effects on aeolian sand movement: Implications for sediment transport and sand control in regions with extreme altitudes or temperatures.SEDIMENTOLOGY,62(4),1024-1038. |
MLA | Han, Qingjie,et al."Air density effects on aeolian sand movement: Implications for sediment transport and sand control in regions with extreme altitudes or temperatures".SEDIMENTOLOGY 62.4(2015):1024-1038. |
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