The Alaiz Experiment: untangling multi-scale stratified flows overcomplex terrain

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 (