I am currently experiencing a same kind of problem. My waves lose a
lot of height as they travel to the shore for no apparent reason, have
you in the meantime solved this problem. I have the feeling that
something must be wrong in my wave-module.
Thank you in advance.
Have you checked that there is water in this inshore region? (Check
in the FLOW GUI Visualisation tool or get output from the FLOW
simulation). Possibly the GEBCO bathy nearshore means that you have
dry cells along the shoreline.......