US Naval Academy adds Wave Attenuator

To create a perimeter of protection behind its pile-supported fixed piers, the United States Naval Academy (USNA) in Annapolis, Maryland added a new wave attenuator. The floating concrete breakwater from industry leader SF Marina USA will not only shield man-made Santee basin from wave action from the Severn River and Chesapeake Bay but also add much-needed on-deck sailboat storage.

Lead contractor and engineer Tuckman-Barbee Construction designed the 61m attenuator using 13 SF Marina SF400 Series concrete floating breakwater pontoons. Virtually unsinkable, their unique geometry provides unprecedented stability, even in the worst storms. A patented coupling system allows them to absorb wave energy without damage.

Subcontractors Crandell Marine Construction and Seaward Marine Construction installed the SF Marina breakwater. A 15m opening was created for access to the basin that provides ample room for vessel maneuverability. Integrated utility ducts provide power and water and contain sewage pump-out lines. Each pontoon is moored with two 61cm steel piles.

One of the breakwater sections is fitted with rows of stainless steel tracks along its length. Attached to these are sloped timber docks for the USNA’s fleet of racing dinghies. An oversized ramp is used to roll the sailboats down the concrete dock from the fixed pier.

Since its founding 178 years ago, the USNA has graduated nearly 89,000 midshipmen, most of whom went on to serve in the US Navy or US Marine Corps. Its list of significant alumni includes 73 Medal of Honor recipients and one US president. The 157-hectare campus is 51km west of Washington, D.C. Its website is www.usna.edu