Beschreibung:
<jats:p>Abstract. The wake of a single wind turbine in complex terrain is analysed using
measurements from lidars. A particular focus of this analysis is the wake
deficit and propagation. Six scanning lidars (three short-range and three
long-range WindScanners) were deployed during the Perdigão 2015
measurement campaign, which took place at a double-ridge site in Portugal.
Several scanning scenarios, including triple- and dual-Doppler scans, were
designed to capture the wind turbine wake of a 2 MW turbine located
on one of the ridges. Different wake displacements are categorized according
to the time of the day. The results show a strong dependence of the vertical
wake propagation on the atmospheric stability. When an atmospheric wave is
observed under stable conditions, the wake follows the terrain down the ridge
with a maximum inclination of -28∘. During unstable conditions, the
wake is advected upwards by up to 29∘ above the horizontal plane.
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