干旱区生态环境知识资源中心(Arid): Turbulence length scales in a low-roughness near-neutral atmospheric surface layer

Arid

DOI	10.1080/14685248.2019.1677908
	Turbulence length scales in a low-roughness near-neutral atmospheric surface layer
	Emes, Matthew J.1; Arjomandi, Maziar 1; Kelso, Richard M.1; Ghanadi, Farzin 2
通讯作者	Emes, Matthew J.
来源期刊	JOURNAL OF TURBULENCE
ISSN	1468-5248
出版年	2019
卷号	20 期号:9 页码:545-562
英文摘要	This paper investigated the integral length scales of turbulence in a low-roughness atmospheric surface layer (ASL), characterised by very smooth terrain in the Utah desert during near-neutral conditions, and evaluated the Engineering Sciences Data Unit (ESDU) 85020 and 86010 predictions for the turbulence length scales in a low-roughness ASL. The correlation integral method was used to estimate the integral length scales of the velocity components with longitudinal, lateral and vertical separations from sonic measurements on a vertical tower and spanwise array in the Surface Layer Turbulence and Environmental Science Test (SLTEST) field experiment. It was found that the longitudinal integral length scales calculated using near-neutral SLTEST data followed a logarithmic relationship with height proportional to the mean velocity profile with approximately constant integral time scale, however the sizes of the longitudinal components of the energy-containing eddies in the low-roughness flat terrain were 2?3 times smaller than those previously measured during field experiments in open country terrains. The calculated length scales with longitudinal separations over the very smooth terrain characteristics of the salt flats at Dugway were not consistent with those predicted by ESDU 85020. In contrast, the scaling of the lateral and vertical components of the three-dimensional turbulence structure with respect to the longitudinal component in the low-roughness ASL were consistent with similarity theory predictions in ESDU 86010 that the scaling ratios are independent of terrain roughness. Furthermore, this confirms the large dependence of the longitudinal turbulence length scales on the upstream terrain roughness and highlights the large variation of turbulence length scales observed at different low-roughness sites in the literature.
英文关键词	Integral length scale integral time scale cross-correlation turbulence intensity atmospheric surface layer
类型	Article
语种	英语
国家	Australia
开放获取类型	Green Published
收录类别	SCI-E
WOS记录号	WOS:000489802000001
WOS关键词	BOUNDARY-LAYERS ; WIND ; VELOCITY ; SPECTRA ; REGION
WOS类目	Mechanics ; Physics, Fluids & Plasmas
WOS研究方向	Mechanics ; Physics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217401
作者单位	1.Univ Adelaide, Sch Mech Engn, Adelaide, SA, Australia; 2.Univ Newcastle, Sch Engn, Newcastle, NSW, Australia
推荐引用方式 GB/T 7714	Emes, Matthew J.,Arjomandi, Maziar,Kelso, Richard M.,et al. Turbulence length scales in a low-roughness near-neutral atmospheric surface layer[J],2019,20(9):545-562.
APA	Emes, Matthew J.,Arjomandi, Maziar,Kelso, Richard M.,&Ghanadi, Farzin.(2019).Turbulence length scales in a low-roughness near-neutral atmospheric surface layer.JOURNAL OF TURBULENCE,20(9),545-562.
MLA	Emes, Matthew J.,et al."Turbulence length scales in a low-roughness near-neutral atmospheric surface layer".JOURNAL OF TURBULENCE 20.9(2019):545-562.