There is a Heightmap/mask right under the landscape on the BP_Ocean. If you load the Default map and change that Heightmap your are going to see what you are talking about, i guess it controls the density/movement of the waves based on black, normal wave movement to white, no movement at all.
i didnt read part:
try to export it as a png file from the landscape menu, here is the answerhub question related to it.
questions/11999/export-landscape-heightmap.html
Hope it helps