Ultradissipative beaches have a relatively straight, steep, cuspated high tide beach, and a low gradient concave, featureless, wide (averages 400-500 m) intertidal zone.
They occur on the higher energy, tide modified coasts with waves averaging 0.5 m, and are favoured by higher tide ranges and fine sand. They have a wide zone of spilling breakers of 0.5-1.5 m height (height increases with onshore wind velocity) at high tide and low tide. At high tide and low tide stay inshore of breakers zone for safest bathing because water depth increases gradually beyond breakers.
Typical ultradissipative beaches include: Orewa (Marie Place), Rabbit Island, Tahunanui Beach.
NIWA