Preprints
https://doi.org/10.5194/wes-2021-44
https://doi.org/10.5194/wes-2021-44

  17 Jun 2021

17 Jun 2021

Review status: this preprint is currently under review for the journal WES.

On the measurement of stability parameter over complex mountainous terrain

Elena Cantero1, Javier Sanz1, Fernando Borbón1, Daniel Paredes2, and Almudena García3 Elena Cantero et al.
  • 1National Renewable Energy Centre (CENER), Sarriguren, Spain
  • 2Iberdrola, Madrid, Spain
  • 3Smart Cities Institute, Universidad Pública de Navarra (UPNA), Spain

Abstract. Atmospheric stability has a significant effect on wind shear and turbulence intensity, and these variables, in turn, have a direct impact on wind power production and loads on wind turbines. It is therefore important to know how to characterize atmospheric stability in order to make better energy yield estimation in a wind farm.

Based on research grade meteorological mast at Alaiz (CENER's Test Site in Navarre, Spain) named MP5, this work compares and evaluates different instrument set-ups and methodologies for stability characterization. The Obukhov parameter ζ = z/L, which can be measured locally with the use of a sonic anemometer, and bulk Richardson number have been studied. The methods are examined considering their theoretical background, implementation complexity, instrumentation requirements, and practical use in connection with wind energy applications.

Bulk Richardson number, which is based on one height wind speed measurement and two temperature measurements, is sometimes calculated using values from any two temperature levels without taking into account that one of the measurements would be representative of surface conditions. With the data available in MP5, it will be shown how this approximation is not correct to obtain an adequate stability characterization.

Elena Cantero et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-44', Anonymous Referee #1, 18 Aug 2021
    • AC1: 'Reply on RC1', Elena Nouqueret, 09 Sep 2021
  • RC2: 'Comment on wes-2021-44', Llorenç Lledó, 01 Sep 2021
    • AC2: 'Reply on RC2', Elena Nouqueret, 21 Sep 2021

Elena Cantero et al.

Elena Cantero et al.

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Short summary
The impact of atmospheric stability on wind energy is widely demonstrated, so we have to know how to characterize it. This work based on a meteorological mast located in a complex terrain, compares and evaluates different instrument set-ups and methodologies for stability characterization. The methods are examined considering their theoretical background, implementation complexity, instrumentation requirements, and practical use in connection with wind energy applications.