Breakwaters, sea walls, and groins are all examples of

Breakwaters, seawalls, and groins are all examples of shoreline structures.

Shoreline structures are built with the purpose to change ocean waves, sand movements and currents. Breakwaters are built to minimise the intensity of wave action reducing erosion in the coast or and creating a safe harbourage for ports. A seawall is a defence wall constructed to protect human habitation, or other areas of human interest, from the action of tides or waves maintaining the coastal area where the wall is unchanged. A groin structure built from an ocean shore perpendicular to the shoreline that stops the water flow and limits sediment's movement. It is constructed to prevent great movement of sediments and erosion.