I am setting up a model with the intent of quantifying the wave transformation at an exposed coastal site dominated by long period swells. The model seems to be working as expected for these types of conditions. When I try to test a shorter period wave (1m Hs with 6 second period), I get significant dissipation of the wave energy in the first few cells of the model. In other words, the waves never make it to shore (or my breakwater). Any thoughts on what may be causing this?