Answer
To prevent a tourist beach from losing its sand when faced with high longshore currents, several coastal structures can be implemented to stabilize the beach and protect it from erosion. Some of these structures include:
1. Groynes: Groynes are low, perpendicular structures constructed perpendicular to the shoreline. They work by trapping and retaining sand that is moved by longshore currents. By interrupting the continuous movement of sand along the beach, groynes help build up and widen the beach.
2. Breakwaters: Breakwaters are offshore barriers constructed parallel to the coast. They act as a buffer against wave energy, reducing the force of longshore currents and preventing erosion. Breakwaters create calmer water conditions behind them, allowing sand to settle and accumulate, thus helping to maintain the beach's sand.
3. Seawalls: Seawalls are vertical structures built parallel to the shoreline to protect coastal properties from wave action and erosion. While they may not prevent sand loss directly, they can help stabilize the shoreline, reducing the impacts of longshore currents and preventing further erosion that could contribute to beach degradation.
4. Beach Nourishment: Beach nourishment involves adding sand to an eroded beach to restore its width and volume. Sand is typically dredged from offshore sources or brought in from other locations. Beach nourishment helps counteract the effects of longshore currents by replenishing the sand lost due to erosion, maintaining the beach's aesthetic appeal and recreational value.
5. Dune Restoration: Dunes act as natural barriers against erosion and provide protection to the beach and inland areas during storms and high waves. Restoring and enhancing dune systems by planting native vegetation and stabilizing the dunes can help retain sand and protect the beach from the impacts of longshore currents.
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