Diffraction on St Bees beach

I took this picture on the beach at St Bees in January. The wind was blowing from the north, pushing the waves down towards me as shown by the two big arrows. At A and C there is some diffraction around the big stone but the water is much less disturbed at B than it is on the far side of the rock. If you look at the other rocks it is also true that the water is much less disturbed on this side than the far side. The situation is like FM radio waves trying to diffract around a mountain. The wavelength of these water ripples is much, much smaller than the size of the rock so there is not much bending (diffraction) around the rocks. That's why FM radio reception is poor inn the Lake District. The radio waves are much smaller than the mountains and don't bend round them very easily.