Hi
I have just seen your thread, I have seen the shore effect before using a spline based solution to give the effect (link: UE4 Spline Mesh Solutions - YouTube )
I am assuming it uses a flat mesh with an animated texture/flipbook to create the wave effect and is tiled along the plane that follows the spline. I have not looked into creating spline meshes as I currently do not have much spare time but that would be my guess of where to start.
Hopefully it helps.