Sheet Pilings with end profiles and other profiles available can be used to build retaining walls. The sheet pilings can be installed using the interlocking features to construct a marine retaining wall to protect the shore from hurricanes.
Pictured is 2" x 10" V Tongue composite Groove Planks
Retaining Walls are built near the piers to prevent erosion and protect the pier.
Composite Sheet Piling, Round piling 8 inch diameter other diameter pilings available, fender pilings, square pilings, are some of the various different shapes used in building boat docks.