Absorbing wave energy at RSPB Conwy

Back to look at the waves on the pond again. Once again, the wind was driving in from the south so the waves were coming towards me. But notice how they stop. I'm guessing that there are plants submerged just below the surface at this point, but whatever it is stops the waves. Something must be either absorbing the energy or reflecting it. Maybe it's like when ultrasound has goes from one medium to another. If the difference in wave speed is big then the majority of the waves are reflected back and only a few are transmitted.