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
Shallow flows with relatively transparent water, captured by 4K camera drones and filtered by computer, can help to define the bathymetry without more expensive data acquisition. See this example nearby "Sotos del Ebro, Alfaro".
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