Erosion also occurs at areas where a seawall has been built to protect structures from storm surge and storm waves. Studies done in Narrabeen Beach, Australia Rips are characteristic of intermediate beach types. Four mechanisms of rip development have been proposed. There are two categories of rip currents. They are erosional rip currents and accretional rip currents.
Rip currents increase in size and intensity and decrease in number as waves increase.
Both kinds of erosional rips are a major mechanism for transporting beach and inner surf-zone sediment seaward of the breaker zone. Types of Rip Currents here are four general types of rip currents. Fixed rip currents occur at sand beaches only. They can be found in one location, where it is deeper than the surrounding area. The rip changes with changes in surf conditions.