What is the role of sand dunes in preventing coastal erosion?

Sand dunes play a significant role in preventing coastal erosion by acting as a natural barrier against wave energy and tidal forces. When waves approach the shoreline, they can cause erosion by removing sediment and destabilizing the land. The presence of sand dunes can mitigate this impact by absorbing some of the wave energy, thereby reducing the strength and reach of the waves that hit the coastal areas.

Specifically, as a barrier, sand dunes reduce the force of the water moving inland during high tides and storm surges. They can also help to stabilize the shoreline by trapping sand and promoting the development of more extensive dune systems over time. This process not only protects the beach from erosion but also supports the ecosystem found in coastal environments.

While sand dunes offer crucial protection, they do not completely block all wave activity, as some energy can still reach the coast, especially during severe weather. The statement regarding freshwater storage does not accurately reflect the primary role of sand dunes, as they mainly consist of dry sand and are not conducive to storing water. While recreational activities may take place on or around sand dunes, this does not relate to their environmental functions in terms of coastal protection.