materials in the mooring system. Wire cable has occasionally been used, but 

 cable is subject to both axial fatigue and corrosion weakening. Chain moor- 

 ings should be attached to the breakwater in a manner that distributes the 

 load between two or more modules. This can be accomplished by attaching a 

 short bridle to the outer tires of the module, and then attaching the mooring 

 chain to the bridle. 



Because of its unique construction aspects, the recommended mooring line 

 of the Wave-Guard (Harms, 1979a) consists of a tire mooring damper located at 

 the breakwater end of the mooring line, plus an anchor chain near the bottom 

 (Fig. 98). The use of open-link low-carbon chain (1/2-inch diameter) appears 

 to be most economical. This chain has an average tensil strength of 2,200 

 pounds and is heavy enough to withstand years of abrasion. The tire mooring 

 damper should consist of at least five tires in series. The mooring line 

 should be fastened to the poles or piling through 2 tires about 10 tires from 

 the end. 



Q 1 = 3CT ^SSI^^ , S 1 ^ 



PLAN VIEW 



! llll |] l! l l !Jll ! !i " i H I IT]TMiTr -^' 



ELEVATION 



Figure 98. Schematic of Wave-Guard scrap-tire floating breakwater 

 mooring system (after Harms, 1979a). 



146 



