The only thing that seems to be missing is the movement of sand as water sloshes over it. But I guess it would be more difficult to simulate tiny solid particles suspended in turbulent water. For now, let's just say that this beach is made of cardboard :p
Sand behaves much differently than liquid. The friction between sand grains is not like viscosity and it lacks surface tension too. I don't know any continuous model that describes the movement of sand similar to Navier-Stokes for liquid.
https://www.sidefx.com/index.php?option=com_content&task=vie...
They used to be on the fore front of this kind of R&D, so I guess it's pretty state of the art (as a CGI package of course).