|Ingenhorst et al. present a study about a multicopter equipped with a sonic anemometer to measure wind speed and wind direction at flexible points in space, and in particular in complex terrain. They introduce the system as a possible replacement for site assessment with CFD. Unfortunately I can not see the innovation in this study, since multicopters equipped with sonic anemometers have been reported and multiple times before and the analysis and validation that is done in this study does not go beyond what has been done before. I think the authors have also not done a good job in reviewing the state of the art, because references to very similar systems are missing (e.g. Shimura et al., 2018; Nolan et al., 2018; Reuter et al., 2020; Thielicke et al., 2020, list not complete...). |
I believe that multicopters as wind measurement systems are a very valuable tool, but I do not at all agree that they can replace CFD in any way and think that suggesting this idea is very misleading for the broad audience. Airborne measurements can be a validation tool for CFD or lidars, but this is not included in this study. I think the authors are missing a good understanding of atmospheric boundary layer flow if they believe that some short measurement flights can give enough insight for a site assessment, especially in complex terrain. Again, this is reflected in a lack of suitable references and the missing discussion of atmospheric conditions during the measurement campaign.
I believe that the authors have a good instrument for wind measurement, but I strongly suggest that they reconsider what the original scientific contribution is that they can make with this study. I think the development of suitable measurement strategies / flight paths for the analysis of flow structures in complex terrain could be of interest, especially in combination with CFD, but this is not evaluated well enough to be published in WES at this point.
Nolan, P., Pinto, J., González-Rocha, J., Jensen, A., Vezzi, C., Bailey, S., de Boer, G., Diehl, C., Laurence, R., Powers, C., and et al.:Coordinated Unmanned Aircraft System (UAS) and Ground-Based Weather Measurements to Predict Lagrangian Coherent Structures(LCSs), Sensors, 18, 4448, https://doi.org/10.3390/s18124448, http://dx.doi.org/10.3390/s18124448, 201
Reuter, M., Bovensmann, H., Buchwitz, M., Borchardt, J., Krautwurst, S., Gerilowski, K., Lindauer, M., Kubistin, D., and Burrows, J. P.: Development of a small unmanned aircraft system to derive CO2emissions of anthropogenic point sources, Atmospheric MeasurementTechniques Discussions, 2020, 1–27, https://doi.org/10.5194/amt-2020-234, 2
Shimura, T., Inoue, M., Tsujimoto, H., Sasaki, K., and Iguchi, M.: Estimation of Wind Vector Profile Using a Hexarotor Unmanned AerialVehicle and Its Application to Meteorological Observation up to 1000 m above Surface, Journal of Atmospheric and Oceanic Technology,35, 1621–1631, https://doi.org/10.1175/jtech-d-17-0186.1, 2018.
Thielicke, W., Hübert, W., and Müller, U.: Towards accurate and practical drone-based wind measurements with an ultrasonic anemome-ter, Atmospheric Measurement Techniques Discussions, 2020, 1–29, https://doi.org/10.5194/amt-2020-258, 2020