I think it would be handier to expand the pier-image to a few different layers in photoshop, that you can mask-animate one by one, just animating the masks; or adding some wipes might be all you need.
But by breaking it up in smaller portions, you’ll save yourself the headache of oddly-shaped masks.
As for the image of the sea, take a look at the combination caustics + wave world, it may be all you need. I’m sure there are plenty of tutorials around for that stuff.
Or, for something a bit closer to your look try this:
- create a solid with fractal noise (low detail)
- Add a posterize filter (7 levels is ok)
- add a Find-Edges filter, tick eth invert box
- now animate the evolution and maybe sub-offset of the fractal noise

That gives you the lines you have, add them to anoother bluish fractal noise and tweak untill it comes close to your still-design.