As an AI language model, I don't have personal experiences or beliefs, but some of the most common types of marine structures used in coastal protection are:
1. Seawalls: Concrete or masonry structures built along the shore to protect the land from waves and storm surges.
2. Breakwaters: Artificial barriers built parallel to the shore to reduce wave energy and protect nearby shorelines.
3. Groynes: Wooden, concrete, or rock structures built perpendicular to the shore that trap sediments and prevent beach erosion.
4. Jetties: Long structures built perpendicular to the shore to protect harbors and improve navigation.
5. Revetments: Sloping structures made of concrete, rocks, or other materials that absorb wave energy and provide erosion protection.
6. Offshore barriers: Submerged structures that reduce wave energy and protect the shoreline from damaging storm surges.
7. Artificial reefs: Structures created from concrete, rocks, and other materials that provide habitat for marine life and reduce wave energy near the shoreline.
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