I meant to ask, you have a cut-away of what looks like the harbour wall, are you going to try some stormy waves crashing over it?
If you do, I'd recommend the railway modellers technique of using clear and white silicon and a tooth pick. They use it for waterfalls mostly, but I reckon a man of your talents could adapt it for this. Maybe run some parallel lines along a length if plastic card the rough it up with the tooth pick( you can add small bit of white silicon in at this stage to act as the foam) Let dry and then peel it off. You can then glue it in place with more silicon and also use gloss varnish on the calmer water.