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

Autor: Javier Sanz Rodrigo, Joan Cuxart, Jakob Mann, Belén Martí, Fernando Borbón, Nikola Vasiljevic, Pedro A. Santos, Daniel Martínez-Villagrasa, Elena Cantero
Jazyk: angličtina
Rok vydání: 2020
Předmět:
Zdroj: Wind Energy Science, Vol 5, Pp 1793-1810 (2020)
Santos, P, Mann, J, Vasiljević, N, Cantero, E, Sanz Rodrigo, J, Borbón, F, Martínez-Villagrasa, D, Martí, B & Cuxart, J 2020, ' The Alaiz experiment: Untangling multi-scale stratified flows over complex terrain ', Wind Energy Science, vol. 5, no. 4, pp. 1793-1810 . https://doi.org/10.5194/wes-5-1793-2020
ISSN: 2366-7451
2366-7443
Popis: 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 time-resolved manner, 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 that includes a cross section of the valley. We observed a hydraulic jump in the lee side of the mountain. For this case, the Froude number transition from supercritical (>1) at the mountain to subcritical () at the valley is in agreement with previous experiments at a smaller scale. For a 1-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 and complementary ground-based observations. These measurements can aid the evaluation of multi-scale numerical models as well as improve our knowledge with regards to mountain meteorology.
Databáze: OpenAIRE
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