This is a particular village 30 Kms upstream Saragosse along the Ebro river, Google-Map, where we can observe a riverine island with its typical confluence pattern, and our computer LSPIV video processing:
What´s beneath the following flow pattern ? Drone zenithal view subsequently vectorized with LSPIV. You´ve got it; just this groyne when submerged flow begins !
A rather complex process, which can lead to spectacular images of mixing eddies. Practical questions like: what´s the mixing length, the influence of each stream speed and width, and how do they change along the interface, can be derived for simple cases with math models.
Drones make easier to recognize surface speed patterns and debris storage areas in order to clean up plastic litter , as this image of Alcala de Ebro groynes shows. See more at The Ocean Clean Up project and https://doi.org/10.3390/rs11172045
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