What role do groins play in coastal management?

Groins are structures built perpendicular to the shoreline and are primarily designed to manage sediment along coastlines. Their main function is to help trap littoral drift, which is the natural movement of sand along the coast caused by wave action. As waves approach the shore at an angle, they push sand along with them. Groins interrupt this process by creating a barrier that causes the water to slow down, allowing sand to accumulate on one side of the groin. This accumulation can help build up beaches and prevent erosion in certain areas, essentially maintaining the coastline.

While groins can indeed impact local ecosystems and may influence recreational opportunities, these are not their primary purposes. Their role in drainage is minimal, as they are not designed for water management but primarily for sediment control. Understanding the primary function of groins is crucial in coastal management, especially in terms of preserving beach areas and addressing erosion challenges.