Review of "Characterization of flow recirculation zones in complex terrain using multi-lidar measurements"

Abstract

This paper reports measurements over a double ridge from a range of instruments (sonic anemometers on 100 m wind masts, Doppler lidars, etc.) made during the Perdigao field campaign in Portugal. The study focuses mostly on the occurrence of flow separation in the lee of the upwind hill, because of the importance for wind-power applications of the decrease of mean wind speed and increase of turbulence intensity that accompanies flow separation (and its effect on the downwind hill). The manuscript represents a substantial contribution to scientific progress, within the scope of ACP, being especially relevant due to the novel and comprehensive data gathered using state-of-the-art equipment. These data are processed and interpreted appropriately, although a number of improvements are possible (see below). The scientific approach, methodology and assumptions seem overall sound, and are described and discussed C1