How are jetties and groins similar in how they manage beach erosion

Question

Both are soft alternative strategies that use barriers to keep sand on the beach
Both are hard structures that keep sand on the beaches
Both use vegetation to keep sand on the beach
Both use beach nourishment to replenish sand on the beach

Answer 1

The correct answer is: Both are hard structures that keep sand on the beaches.

Jetties and groins are both man-made structures designed to manage beach erosion and sediment deposition. They are constructed from materials like concrete or stone and serve to protect beaches by preventing the movement of sand. Jetties are typically built at the mouth of rivers or harbors to protect the inlet, while groins are built perpendicular to the shoreline to trap sand moving along the coast. Both structures disrupt natural water flow and sediment transport, leading to the accumulation of sand on one side and erosion on the other.