Here is the height map which describes the beach and the underwater area (the original is 512x512):
I put in two wavefronts, let Waves World work, then received this image (the original is 512x512):
All that remains is to create two terrain objects in Bryce, put the beach on one and the waves on the other, resize the terrains, then let Bryce work.
Created by Mark L. Hessenflow
9. February 1996