Bar

Definition of : Sandy or gravelly (partially) submerged bed structure with a length typically a few orders of magnitude larger than the water depth (i.e. larger than ripples, dunes or sandwaves). Bars arise from the interaction of the sediment bed with currents and waves. This is the common definition for , other definitions can be discussed in the article

Breaker bar

A breaker bar is a submerged embankment of sand or gravel built in the breaker zone due to the action of breaking waves and cross-currents.

• There can be several rows of bars.
• Bars are very mobile formations, which tend to be in mobile equilibrium with the presently occurring wave and tide conditions, which means that they are constantly changing.
• The overall tendency is that the bars are moving seawards during storm wave conditions and landwards during conditions dominated by smaller waves and swell.
• At intervals there are gaps in the bars formed by the rip currents.

See also

Rhythmic shoreline features

Stability models