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1. Megarips are a major cause of beach erosion on high-energy embayed beaches, and their persistence and cumulative effect during storm groups can lead to extreme erosion and seaward sediment export.

2. The location and dynamics of megarips are topographically controlled, with rip location being determined by alongshore variations in breaking wave height and obliquity, as well as interaction of wave-driven circulation patterns and embayment nearshore topography.

3. Moderate beach sand loss during individual storms is linked to the development of megarips with associated rip-neck and feeder channels, which can persist for several months under non-storm conditions, reducing beach recovery ability until the rip-neck and feeder channels are infilled.

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