干旱区生态环境知识资源中心(Arid): Influential factors on the repose angle of desert sands

Arid

DOI	10.3724/SP.J.1226.2011.00017
	Influential factors on the repose angle of desert sands
	Liu, JianBao; Wang, NaiAng; Cheng, HongYi; Yang, WenTao; Guo, ZhiQiang
通讯作者	Wang, NA
来源期刊	SCIENCES IN COLD AND ARID REGIONS
ISSN	1674-3822
出版年	2011
卷号	3 期号:1 页码:17-23
英文摘要	The repose angle is one of the most significant macroscopic parameters in describing the behavior of granular materials. Under a static condition, the repose angle is the steepest angle at which sediment particles can rest without motion. In this paper, we use existing data and aeolian physics to analyze the main factors that influence the repose angle of sand dunes, and we investigate different repose angles involving various states and types of materials. We have determined that different factors have differential influence on the magnitude of the repose angle. Our results show that for powdery (< 400-mu m diameter) desert sands, the main influential factor on the magnitude of repose angle is the molecular force among particles. Particle size does not influence the repose angle of desert sands directly, but has an indirect impact by affecting the grit sphericity and surface roughness, of which the grit sphericity acts as a major factor. Even at the same average particle size, the repose angle differs with different grain compositions. Furthermore, with increasing unevenness in grain composition, the repose angle increases correspondingly. Sand texture also has a direct influence on the repose angle of desert sands. In two sand samples having the same grain composition but different textures, the repose angles may be different. Water content has a stronger influence on the repose angle than any other factor. However, the relationship between the repose angle and water content is not a simple direct proportion. In fact, with increasing water content, the repose angle first increases and then decreases. These research results will be useful for understanding the mechanisms of dune transport, variations of dune morphology, and the stability and fluidity of dune sands.
英文关键词	repose angle desert sands plastic sands uniformity coefficient water content
类型	Article
语种	英语
收录类别	ESCI
WOS记录号	WOS:000422283200003
WOS关键词	TRANSPORT ; ROUGHNESS ; MODELS ; FLOWS ; DUNES
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/329830
作者单位	[Liu, JianBao] Lanzhou Univ, Res Sch Arid Environm & Climate Change, Lanzhou 730000, Gansu, Peoples R China; [Liu, JianBao; Wang, NaiAng; Cheng, HongYi; Yang, WenTao; Guo, ZhiQiang] Lanzhou Univ, Coll Resources & Environm, 222 Tianshuinan Rd, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Liu, JianBao,Wang, NaiAng,Cheng, HongYi,et al. Influential factors on the repose angle of desert sands[J]. 兰州大学,2011,3(1):17-23.
APA	Liu, JianBao,Wang, NaiAng,Cheng, HongYi,Yang, WenTao,&Guo, ZhiQiang.(2011).Influential factors on the repose angle of desert sands.SCIENCES IN COLD AND ARID REGIONS,3(1),17-23.
MLA	Liu, JianBao,et al."Influential factors on the repose angle of desert sands".SCIENCES IN COLD AND ARID REGIONS 3.1(2011):17-23.