Essentially two classes of free edge waves can exist on a sloping continental shelf in the presence of Coriolis force. For small longshore wave length, fundamental waves of the first class behave like Stokes edge waves. However, for great wave lengths (of several hundred kilometers or more) the characteristics of the first class are significantly altered. In the northern hemisphere the phase speed for waves moving to the right (facing shore from the sea) exceeds the speed for waves which move to the left. Also, the group velocity for a given edge wave mode has a finite upper limit....
Reid, Robert O.. 1958. "Effect of Coriolis force on edge waves (I) Investigation of the normal modes." Journal of Marine Research 16, (2). https://elischolar.library.yale.edu/journal_of_marine_research/888