干旱区生态环境知识资源中心(Arid): Numerical simulation of wind field and sand flux in crescentic sand dunes

Arid

DOI	10.1038/s41598-021-84509-x
	Numerical simulation of wind field and sand flux in crescentic sand dunes
	Zhang, Huiwen; Wu, Zhen; Hu, Jing; Zhang, Zhiping; Xiao, Bin; Ma, Jianping
通讯作者	Wu, Z (corresponding author), Earthquake Adm Gansu Prov, Lanzhou Geophys Natl Field Sci Observat & Res Stn, Earthquake Adm, Lanzhou 730000, Peoples R China. ; Wu, Z (corresponding author), China Earthquake Adm, Key Lab Loess Earthquake Engn, Lanzhou 730000, Peoples R China.
来源期刊	SCIENTIFIC REPORTS
ISSN	2045-2322
出版年	2021
卷号	11 期号:1
英文摘要	Sand flux is the key factor to determine the migration of sand dunes and the erosion to the surrounding environment. There are crescent-shaped sand dunes of various scales in the desert, and there are significant differences in spatial wind field and sand flux among them. However, due to the difficulty of monitoring, it is difficult to continuously observe the spatial wind field and sand flux around the larger crescentic dunes. On the basis of the Reynolds-Average Navier-Stokes (RA-NS) equation and the stress and sand flux model, the distribution of wind field and sand flux of a circular dune with a height of 4.2 m and a length of about 100 m during the four evolutionary periods of the evolution into a crescentic dune was simulated in this study. By comparing with the measured results, we verified that the closer to the leeward side, the more the simulated values of the velocity in wind field and sand flux were in line with the measured results. In order to further analyze the influence of the height of dune and other relevant parameters on sand flux, we simulated the influence on wind field and sand flux by changing the air viscosity and wind velocity of upper boundary. We found that the air viscosity mainly affected the amount of deposited sand on the leeward side of sand dune, while the increase of wind velocity would undoubtedly increase the sand flux of the whole sand dune. In addition, the simulation results also showed that the influence of changes in height of dune on the turbulent intensity of leeward side was very significant, and the turbulent intensity increased with the height of dune. The height changes of tall dunes gradually affected the transport of sand caused by wind flow behind the leeward side because that the rotation of the wind flow would form new vortexes at the large pores behind the leeward side, which would increase the turbulent energy in space and thus would increase the distance of migration of the lifting sand. While the low sand dunes could not form extra small vortexes at the bottom of the leeward side, so the wind velocity was small and the eddy currents behind the leeward side were more stable. The simulation results indicated that wind velocity was not the only reason for increasing the amount of sand flux, and the fluctuation of wind flow caused by turbulence could also stimulate the movement of sand particles on the ground.
类型	Article
语种	英语
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000625411400006
WOS类目	Multidisciplinary Sciences
WOS研究方向	Science & Technology - Other Topics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/351746
作者单位	[Zhang, Huiwen; Hu, Jing; Zhang, Zhiping; Xiao, Bin; Ma, Jianping] Gansu Desert Control Res Inst, State Key Lab Breeding Base Desertificat & Aeolia, Lanzhou 730070, Peoples R China; [Wu, Zhen] Earthquake Adm Gansu Prov, Lanzhou Geophys Natl Field Sci Observat & Res Stn, Earthquake Adm, Lanzhou 730000, Peoples R China; [Wu, Zhen] China Earthquake Adm, Key Lab Loess Earthquake Engn, Lanzhou 730000, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Huiwen,Wu, Zhen,Hu, Jing,et al. Numerical simulation of wind field and sand flux in crescentic sand dunes[J],2021,11(1).
APA	Zhang, Huiwen,Wu, Zhen,Hu, Jing,Zhang, Zhiping,Xiao, Bin,&Ma, Jianping.(2021).Numerical simulation of wind field and sand flux in crescentic sand dunes.SCIENTIFIC REPORTS,11(1).
MLA	Zhang, Huiwen,et al."Numerical simulation of wind field and sand flux in crescentic sand dunes".SCIENTIFIC REPORTS 11.1(2021).