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. The Perdigao campaign 2017 was an international fieldcampaign to measure the flow and its diurnal variation in the atmosphericboundary layer over complex terrain. A huge data set of meteorologicalobservations was collected over the double-hill site by means ofstate-of-the-art meteorological measurement techniques. A focus of thecampaign was the interaction of the boundary layer flow with a single windturbine, which was located on the south-western (SW) ridge top. In thisstudy, a long-term nested large-eddy simulation (LES) of 49-day duration with amaximum horizontal resolution of 200 m is used to describe both the generalmeteorological situation over Spain and Portugal and the local small-scaleflow structures over the double hill during the intensive observation period(IOP). The simulations show that frequently observed nocturnal low-level jets(LLJs) from the NE have their origin over the slopes of the elevated plateaubetween the Portuguese Serra da Estrela and the Spanish Sierra de Gatamountain ranges N and NE of Perdigao and that the diurnal clockwiseturning of the wind direction over the double ridge is induced by slope andvalley winds under weak synoptic conditions. It is found that, in spite of thelong simulation time, modelled and observed wind structures on the ridge topsagree well, while along-valley flow within the valley is underestimated bythe model.

Long-term simulation of the boundary layer flow over the double-ridge site during the Perdigão 2017 field campaign