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Title: Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements

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 200 m 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 0.5 m s -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 occurrencemore » of flow recirculation. Flow recirculation occurs more frequently during periods with wind speeds above 8 m s -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.« less
Authors:
ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [1] ; ORCiD logo [2]
  1. Technical Univ. of Denmark, Lyngby (Denmark)
  2. Univ. of Colorado, Boulder, CO (United States). Dept. of Atmospheric and Oceanic Sciences; National Renewable Energy Lab. (NREL), Golden, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5000-73536
Journal ID: ISSN 1680-7324
Grant/Contract Number:
AC36-08GO28308; AGS-1565498
Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 19; Journal Issue: 4; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States); Univ. of Colorado, Boulder, CO (United States); Technical Univ. of Denmark, Lyngby (Denmark)
Sponsoring Org:
USDOE; National Science Foundation (NSF); Danish Energy Agency (Denmark)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; 54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1503157

Menke, Robert, Vasiljević, Nikola, Mann, Jakob, and Lundquist, Julie K. Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements. United States: N. p., Web. doi:10.5194/acp-19-2713-2019.
Menke, Robert, Vasiljević, Nikola, Mann, Jakob, & Lundquist, Julie K. Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements. United States. doi:10.5194/acp-19-2713-2019.
Menke, Robert, Vasiljević, Nikola, Mann, Jakob, and Lundquist, Julie K. 2019. "Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements". United States. doi:10.5194/acp-19-2713-2019. https://www.osti.gov/servlets/purl/1503157.
@article{osti_1503157,
title = {Characterization of flow recirculation zones at the Perdigão site using multi-lidar measurements},
author = {Menke, Robert and Vasiljević, Nikola and Mann, Jakob and Lundquist, Julie K.},
abstractNote = {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 200 m 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 0.5 m s-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 8 m s-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.},
doi = {10.5194/acp-19-2713-2019},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 4,
volume = 19,
place = {United States},
year = {2019},
month = {3}
}

Works referenced in this record:

Wake Measurements of a Multi-MW Wind Turbine with Coherent Long-Range Pulsed Doppler Wind Lidar
journal, September 2010
  • K�sler, Yvonne; Rahm, Stephan; Simmet, Rudolf
  • Journal of Atmospheric and Oceanic Technology, Vol. 27, Issue 9, p. 1529-1532
  • DOI: 10.1175/2010JTECHA1483.1