1. Prevention of Coastal Erosion

2. Many Ways To Prevent Erosion
Breakwater (above or below water)
Retaining walls (rock/sandbags)
Groynes
Fencing/Netting
Planting vegetation
No movement zones
Replace eroded sand

3. Breakwaters (above and underwater)
Prevents waves from breaking on shore and being destructive with their undertow.

4. Retaining Walls
Reduces erosion from breaking waves on shore.

5. Groynes
In the case of longshore drift, material moving down the beach collects on the windward side of the groyne slowing movement down the beach.

6. Fencing/Netting
Prevents movement of on shore sand by wind and waves by creating barrier (like with groynes).

7. Planting Vegetation
Roots of plants to help hold sand in place.

8. No Movement Zones/Movement Zones
Keeps disruptive traffic minimized.

9. Replacing of Sand
Slows erosion from pushing inland because new material replacing the old.