气候变化领域集成服务门户(CCPortal): Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements

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DOI	10.5194/acp-19-2713-2019
	Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements
	Menke R.; Vasiljevi N.; Mann J.; Lundquist J.K.
发表日期	2019
ISSN	16807316
起始页码	2713
结束页码	2723
卷号	19 期号:4
英文摘要	Because flow recirculation can generate significant amounts of turbulence, it can impact the success of wind energy projects. This study uses unique Doppler lidar observations to quantify occurrences of flow recirculation on lee sides of ridges. An extensive dataset of observations of flow over complex terrain is available from the Perdigão 2017 field campaign over a period of 3 months. The campaign site was selected because of the unique terrain feature of two nearly parallel ridges with a valley-to-ridge-top height difference of about 200m and a ridge-to-ridge distance of 1.4 km. Six scanning Doppler lidars probed the flow field in several vertical planes orthogonal to the ridges using range height indicator scans. With this lidar setup, we achieved vertical scans of the recirculation zone at three positions along two parallel ridges. We construct a method to identify flow recirculation zones in the scans, as well as define characteristics of these zones. According to our data analysis, flow recirculation, with reverse flow wind speeds greater than 0.5ms-1, occurs over 50% of the time when the wind direction is perpendicular to the direction of the ridges. Atmospheric conditions, such as atmospheric stability and wind speed, affect the occurrence of flow recirculation. Flow recirculation occurs more frequently during periods with wind speeds above 8ms?1. Recirculation within the valley affects the mean wind and turbulence fields at turbine heights on the downwind ridge in magnitudes significant for wind resource assessment. © Author(s) 2019.
语种	英语
scopus关键词	atmospheric circulation; complex terrain; lidar; measurement method; observational method; turbulence; wind field; wind velocity
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/144605
作者单位	Technical University of Denmark - DTU Wind Energy, Frederiksborgvej 399, Building 118, Roskilde, 4000, Denmark; Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, United States; National Renewable Energy Laboratory, Golden, CO, United States
推荐引用方式 GB/T 7714	Menke R.,Vasiljevi N.,Mann J.,et al. Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements[J],2019,19(4).
APA	Menke R.,Vasiljevi N.,Mann J.,&Lundquist J.K..(2019).Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements.Atmospheric Chemistry and Physics,19(4).
MLA	Menke R.,et al."Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements".Atmospheric Chemistry and Physics 19.4(2019).