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 2020