The effect of surface gravity waves on the measurement of river surface velocity - Presentation for RiverFlow 2020

Presentation for River Flow 2020 online conference. Key points: •A video of a river surface shows evidence of water waves; •The characteristics of these waves can be quantified and predicted; •Water waves have an observable and modellable effect on the space-time image correlation; •Correlation-based surface velocimetry can be very inaccurate if applied without tracers and in the presence of waves; •A more robust estimate of the velocity can be obtained from a knowledge of the characteristic surface length scales. More detailed information can be found in the article: Dolcetti, G., Hortobágyi, B., Perks, M. and Tait, S. J. (2020), The effect of surface gravity waves on the measurement of river surface velocity, Proceedings of River Flow 202