Tombolo

The wave pattern created by this water movement causes a convergence of longshore drift on the opposite side of the island.

The beach sediments that are moving by lateral transport on the lee side of the island will accumulate there, conforming to the shape of the wave pattern.

A small piece of land, such as an island, or a beached shipwreck can change the way that waves move, leading to different deposition of sediments.

Tombolos are more prone to natural fluctuations of profile and area as a result of tidal and weather events than a normal beach is.

It is easy to see this pattern when the waves are destructive and wash away finer grained material at the top, revealing coarser sands and cobbles as the base.