Variations in cusp spacings of beach cusp systems have been examined, and the conclusion is that the apparent regularity of the spacings is not always real. Established edge wave theory predicts equal cusp spacings, and accordingly, the theory needs
beach of Skallingen, SW Denmark. Data were collected over several tidal cycles comprising low through moderately-high offshore energy conditions, and onshore wave-induced transport during low energy conditions when the waves were not breaking over