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Wind Energy Science The interactive open-access journal of the European Academy of Wind Energy
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https://doi.org/10.5194/wes-2020-89
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/wes-2020-89
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  20 Jul 2020

20 Jul 2020

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This preprint is currently under review for the journal WES.

The Alaiz Experiment: untangling multi-scale stratified flows over complex terrain

Pedro Santos1, Jakob Mann1, Nikola Vasiljević1, Elena Cantero2, Javier Sanz Rodrigo2, Fernando Borbón2, Daniel Martínez-Villagrasa3, Belén Martí3, and Joan Cuxart3 Pedro Santos et al.
  • 1Technical University of Denmark, DTU Wind Energy, Risø Campus, Roskilde, Denmark
  • 2National Renewable Energy Centre (CENER), Sarriguren, Spain
  • 3Physics Department, University of the Balearic Islands (UIB), Mallorca, Spain

Abstract. We present novel measurements from a field campaign that aims to characterize multi-scale flow patterns, ranging from 0.1 to 10 km, in a mountainous region in Northwestern Spain with a mountain-valley-ridge configuration. We select two flow cases where topographic-flow interactions were measured by five synchronized scanning Doppler wind lidars along a 10-km transect line, including a cross-section of the valley flow. We observed a hydraulic jump in the lee-side of the mountain. The Froude number transition from supercritical (> 1) at the mountain to subcritical (< 1) at the valley is in agreement with previous experiments at a smaller scale. For a one-year period, the measurements show such a transition about 10 % of the time, indicating a possible high occurrence of hydraulic jumps. The second flow case presents valley winds that are decoupled from the northerly flow aloft and show a stratified layered pattern, which is well captured by the lidar scans. These measurements can aid the evaluation of multi-scale numerical models as well as improving our knowledge with regards to mountain meteorology.

Pedro Santos et al.

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The Alaiz Experiment (ALEX17): wind field and turbulent fluxes in a large-scale and complex topography with synoptic forcing Pedro Santos, Jakob Mann, Nikola Vasiljevic, Michael Courtney, Javier Sanz Rodrigo, Elena Cantero, Fernando Borbón, Daniel Martínez-Villagrasa, Belén Martí, and Joan Cuxart https://doi.org/10.11583/DTU.c.4508597.v1

Pedro Santos et al.

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Short summary
This study presents results from the Alaiz Experiment (ALEX17), featuring the characterization of two cases with flow features ranging from 0.1 to 10 km in complex terrain. We show that multiple scanning lidars can capture in detail a type of atmospheric wave that can happen up to 10 % of the time at this site. The results are in agreement with multiple ground observations and demonstrate the role of atmospheric stability in flow phenomena that need to be better captured by numerical models.
This study presents results from the Alaiz Experiment (ALEX17), featuring the characterization...
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