干旱区生态环境知识资源中心(Arid): Experimental Investigation of the Aerodynamic Roughness Length for Flexible Plants

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DOI	10.1007/s10546-019-00449-0
	Experimental Investigation of the Aerodynamic Roughness Length for Flexible Plants
	Kang, Liqiang 1,2; Zhang, Junjie 1; Zou, Xueyong 1,2; Cheng, Hong 1,2; Zhang, Chunlai 1,2; Yang, Zhicheng 1
通讯作者	Kang, Liqiang
来源期刊	BOUNDARY-LAYER METEOROLOGY
ISSN	0006-8314
EISSN	1573-1472
出版年	2019
卷号	172 期号:3 页码:397-416
英文摘要	The aerodynamic roughness length z(0) is modelled as a function of the zero-plane displacement d, plant drag coefficient C-dR, the ratio beta of the drag coefficient for an isolated roughness element and the surface drag coefficient, and the lateral cover lambda. The model is investigated using wind-tunnel experiments on a ground surface covered by artificial plastic flexible plants of very small basal-to-frontal area ratios (0.001-0.007). The plant drag coefficient at different plant densities is inferred from measurements of the total shear stress and the average surface shear stress for five plant heights at four plant densities. The aerodynamic roughness length and zero-plane displacement are estimated by logarithmic regression of the measured velocity profile with a predetermined friction velocity. With the increase of lateral cover lambda, the plant drag coefficient can be considered as a constant for lambda < 0.01, and decreasing for lambda > 0.01. With an increase in the friction velocity, the roughness length z(0) generally decreases because of plant flexibility, while with increases in plant density and plant height, the value of z(0) increases because the surface becomes physically rougher. Our model for the roughness length z(0) is verified using experimental data for flow over flexible plants. Compared with rigid roughness elements, such as cylinders, cubes and blocks, the normalized roughness z(0)/h (where h is the plant height) for the flexible plants is smaller because of the porosity and the larger value of the ratio d/h.
英文关键词	Aerodynamic roughness length Drag coefficient Flexible plant Wind-tunnel experiment
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000478747400004
WOS关键词	WIND-TUNNEL ; DRAG PARTITION ; VEGETATION ; DISPLACEMENT ; DESERT ; RATIO ; FIELD ; SURFACES ; ELEMENTS ; DENSITY
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
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/2XILL650/214733
作者单位	1.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; 2.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, Junjie,Zou, Xueyong,et al. Experimental Investigation of the Aerodynamic Roughness Length for Flexible Plants[J]. 北京师范大学,2019,172(3):397-416.
APA	Kang, Liqiang,Zhang, Junjie,Zou, Xueyong,Cheng, Hong,Zhang, Chunlai,&Yang, Zhicheng.(2019).Experimental Investigation of the Aerodynamic Roughness Length for Flexible Plants.BOUNDARY-LAYER METEOROLOGY,172(3),397-416.
MLA	Kang, Liqiang,et al."Experimental Investigation of the Aerodynamic Roughness Length for Flexible Plants".BOUNDARY-LAYER METEOROLOGY 172.3(2019):397-416.