Fun Fact: The term dolphin may come from the French word dauphin, used centuries ago to describe clustered pilings.
When you hear the word dolphin, you might imagine the graceful creature slicing through the water. But in the maritime world, a "dolphin" holds an entirely different meaning and it has nothing to do with animals.
What Is a Dolphin (Structure)?
In marine construction, a dolphin is a man-made structure that extends above the water level and is not connected to the shore. Typically formed by grouping piles (wood, steel, or concrete), dolphins serve a vital purpose in harbor and port operations.
Why Are Dolphins Used?
Dolphins are essential for:
Mooring vessels: Ships use them as tie-off points when docking.
Navigational safety: They help guide vessels and prevent accidental collisions.
Structural protection: They absorb impacts and protect piers, docks, or bridges from damage.
Berthing support: When a full-length quay isn't feasible, dolphins allow large ships to berth safely.
Types of Dolphins
There are several types of dolphins, each designed for specific marine needs:
Mooring Dolphins – Used for mooring lines.
Breasting Dolphins – Help ships align properly by absorbing lateral forces.
Navigation Dolphins – Mark channels or serve as platforms for signs/lights.
How Are Dolphins Built?
Constructed by driving multiple piles into the seabed and securing them at the top, dolphins are designed to withstand high impact from vessel movement, waves, and tides. Over time, they may be fitted with fenders, ladders, or lighting, depending on their use.
As shown in the image, these robust wooden or steel clusters silently stand guard in the water, unattached to land but crucial for smooth marine operations.
Fun Fact: The term dolphin may come from the French word dauphin, used centuries ago to describe clustered pilings.
You’ll find dolphins at:
Ports and harbors
Bridge crossings over water
Offshore terminals
Fuel docks and industrial facilities
In the world of marine logistics and nautical navigation, dolphins (structures) are quiet yet powerful contributors. They ensure safe docking, efficient port operations, and protection for infrastructure.
Next time you spot a group of posts rising from the water away from shore. You’ll know exactly what you're looking at.
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