干旱区生态环境知识资源中心(Arid): Variation of bed microtopography with time around an isolated surface-mounted cylindrical roughness element and its influence on wind flow

Arid

DOI	10.1016/j.aeolia.2021.100688
	Variation of bed microtopography with time around an isolated surface-mounted cylindrical roughness element and its influence on wind flow
	Kang, Liqiang; Zhang, Wen; Zou, Xueyong
通讯作者	Kang, LQ (corresponding author), Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China.
来源期刊	AEOLIAN RESEARCH
ISSN	1875-9637
EISSN	2212-1684
出版年	2021
卷号	50
英文摘要	Bed microtopography around roughness element in the arid environment is often altered by airflow and sediment transport. Understanding the interaction among the roughness element, microtopography and airflow is important to reveal the mechanism of wind erosion around an isolated surface-mounted roughness element. The wind tunnel experiments studied the influence of cylindrical roughness element with larger aspect ratios on bed microtopography evolution, and the influence of microtopography on the wind flow around the isolated cylinder was analyzed by numerical simulation method. A deep well or scour surrounds the cylinder and a symmetrical Vshaped deposition area appears in the lee. Both the erosion and deposition areas of the wider cylinder with aspect ratio of 2 are larger than that of the taller cylinder (aspect ratio of 8). With the increase of blowing time, both the erosion and deposition areas around the wider cylinder increase, while for the taller cylinder, the sand deposition area increases first and then decreases, and the erosion area shows an increasing trend. After the local surface microtopography is adjusted, the streamwise wind velocity in the lee of the cylinder at half of cylinder height is less than the initial wind velocity on the unadjusted flat bed, while the wind speed near the ground in the lee is accelerated obviously. Moreover, the vortex in the recirculation zone behind the cylinder moves upward, leading to the increase of surface shear stress in the lee and surface erosion enhancement.
英文关键词	Roughness element Bed microtopography Wind tunnel experiment Numerical simulation
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000647794900003
WOS关键词	FINITE CIRCULAR-CYLINDER ; SPARSE VEGETATION ; SAND ; TRANSPORT ; EROSION ; TUNNEL ; RATIO ; AREA
WOS类目	Geography, Physical
WOS研究方向	Physical Geography
来源机构	北京师范大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/368956
作者单位	[Kang, Liqiang] Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; Beijing Normal Univ, Fac Geog Sci, Engn Ctr Desertificat & Blown Sand Control, Minist Educ, Beijing 100875, Peoples R China
推荐引用方式 GB/T 7714	Kang, Liqiang,Zhang, Wen,Zou, Xueyong. Variation of bed microtopography with time around an isolated surface-mounted cylindrical roughness element and its influence on wind flow[J]. 北京师范大学,2021,50.
APA	Kang, Liqiang,Zhang, Wen,&Zou, Xueyong.(2021).Variation of bed microtopography with time around an isolated surface-mounted cylindrical roughness element and its influence on wind flow.AEOLIAN RESEARCH,50.
MLA	Kang, Liqiang,et al."Variation of bed microtopography with time around an isolated surface-mounted cylindrical roughness element and its influence on wind flow".AEOLIAN RESEARCH 50(2021).