1.These are man-made marine structures for mooring vessels and to absorb impact force of vessels.

2.The construction in the form of a cluster of closely spaced piles is known as dolphins.

3.The piles are pulled together at the top and tied by a cable. They are marine structures for mooring vessels.

4.Dolphins are used for tying up ships and also for transferring cargo from one ship to another when moored along both of their sides.

5.Dolphins are mainly designed for resisting horizontal impact force, wind force and water current forces from a vessel when docking.