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Comparison of Wind Lidar Data and Numerical Simulations of the Low-Level Jet at a Grassland Site

Author

Listed:
  • Astrid Ziemann

    (Institute for Hydrology and Meteorology, TU Dresden, Pienner Str. 23, 01737 Tharandt, Germany)

  • André Galvez Arboleda

    (Institute of Flight Guidance, TU Braunschweig, Hermann-Blenk-Str. 27, 38108 Braunschweig, Germany)

  • Astrid Lampert

    (Institute of Flight Guidance, TU Braunschweig, Hermann-Blenk-Str. 27, 38108 Braunschweig, Germany)

Abstract

For the increasing importance of the wind energy branch, exact wind climatologies at the operation altitudes are essential. As wind turbines of increasing hub height are erected, the rotors are located at an altitude interval influenced by the phenomenon of low-level jet (LLJ). The main objective of the study is to assess if and how numerical simulations can represent the development especially of nocturnal LLJs in comparison to measurements. In this article, the microscale numerical model HIRVAC2D is used for a range of parameters. The simulated results for properties of the LLJ are compared to lidar data at an altitude range of 40 m to 500 m at the study site Braunschweig in the North German Plain, a grassland location that may be representative for a large area. Similarities and differences of the occurrence, height and maximum wind speed of the nocturnal LLJ are discussed using two different criteria to define a LLJ. The analysis of the lidar data set for the grassland site revealed for the first time increasing height of the LLJ with increasing wind speed during the summer months June to August 2013. The comparison of measurements and simulation data shows that boundary (and inital) conditions have to be adapted in model simulations to provide realistic LLJ properties. It was found that land use and vegetation parameters are important for practical LLJ prognosis, both for wind climatologies and nowcasting.

Suggested Citation

  • Astrid Ziemann & André Galvez Arboleda & Astrid Lampert, 2020. "Comparison of Wind Lidar Data and Numerical Simulations of the Low-Level Jet at a Grassland Site," Energies, MDPI, vol. 13(23), pages 1-14, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6264-:d:452388
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    References listed on IDEAS

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    1. Teklebrhan Negash & Erik Möllerström & Fredric Ottermo, 2020. "An Assessment of Wind Energy Potential for the Three Topographic Regions of Eritrea," Energies, MDPI, vol. 13(7), pages 1-12, April.
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