干旱区生态环境知识资源中心(Arid): Spatial characteristics of wind-sand flow development under natural wind

Arid

DOI	10.1007/s10035-021-01129-y
	Spatial characteristics of wind-sand flow development under natural wind
	Ma, Gaosheng; Zhang, Jinghong; Wang, Yan
通讯作者	Ma, GS (corresponding author), Lanzhou Technol Univ, Fluid Mech & Thermal Engn Dept, Lanzhou 73000, Peoples R China. ; Ma, GS (corresponding author), Lanzhou Technol Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou 73000, Peoples R China.
来源期刊	GRANULAR MATTER
ISSN	1434-5021
EISSN	1434-7636
出版年	2021
卷号	23 期号:3
英文摘要	The spatial characteristics of wind-sand flow development are important for the morphological analysis of sand dunes (especially barchan dunes) used for curbing desertification projects. However, in previous studies, results were mostly obtained under the premise of a stable wind field. In this study, natural unsteady wind is accounted for, and the two-dimensional turbulent flow equilibrium differential equation (the N-S equation) is solved by large-eddy simulation method. On the premise that the characteristics of the simulated flow field are consistent with those of natural wind field, a point force model is used to calculate the trajectory of a large number of dust particles. The analysis focuses on the correlation between the development distance of the wind-sand flow, the turbulence characteristics of the wind field, and the particle size of sand. The results show that the saturation length of the unsteady incoming flow is generally shorter than that of the steady incoming flow (The turbulence intensity is equal to 0). Moreover, the overshoot phenomenon is not obvious when the particle size is small, the maximum value of the sand transport rate is generally smaller than that in stable inflow environment, and the position is more forward as the particle size increases. In addition, the saturation length decreases with an increase in turbulence intensity, and the turbulence intensity is different for the sand transport rate after space development is stable. The sand transport rate is not only delayed in time (< 2 s) but also delayed in space (similar to 2.4 m).
英文关键词	Wind-sand flow Saturation length Overshoot phenomenon Large-eddy simulation Turbulence intensity Natural unsteady wind Spatial characteristics
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000680914900001
WOS关键词	LARGE-SCALE MOTIONS ; TRANSITIONAL BEHAVIOR ; SEDIMENT TRANSPORT ; AEOLIAN SALTATION ; MASS FLUX ; LAYER
WOS类目	Materials Science, Multidisciplinary ; Mechanics ; Physics, Applied
WOS研究方向	Materials Science ; Mechanics ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/363485
作者单位	[Ma, Gaosheng; Wang, Yan] Lanzhou Technol Univ, Fluid Mech & Thermal Engn Dept, Lanzhou 73000, Peoples R China; [Ma, Gaosheng] Lanzhou Technol Univ, Key Lab Mech Disaster & Environm Western China, Lanzhou 73000, Peoples R China; [Zhang, Jinghong] Yancheng Inst Technol, Sch Civil Engn, Yancheng 224000, Peoples R China
推荐引用方式 GB/T 7714	Ma, Gaosheng,Zhang, Jinghong,Wang, Yan. Spatial characteristics of wind-sand flow development under natural wind[J],2021,23(3).
APA	Ma, Gaosheng,Zhang, Jinghong,&Wang, Yan.(2021).Spatial characteristics of wind-sand flow development under natural wind.GRANULAR MATTER,23(3).
MLA	Ma, Gaosheng,et al."Spatial characteristics of wind-sand flow development under natural wind".GRANULAR MATTER 23.3(2021).