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prediction model was developed from two-dimensional, linearized solutions of 

 the hydrodynamical equations formulated in terms of a boundary value problem for 

 the velocity potential. Some nonlinear effects are considered. Results for the 

 predicted transmission coefficients were in good agreement with laboratory and 

 field data, and they showed how the influence of fixed-body transmission, and 

 of sway, heave, and roll motions on the transmission coefficient changed with 

 increasing values of the parameter, beam, (width) to wavelength ratio. The 

 shape of the curves predicting the mooring line forces as a function of the 

 beam (width) to wavelength ratio (or of wave frequency) followed those for the 

 measured responses, but predicted magnitudes did not agree closely with meas- 

 ured values. 



The floating breakwater at Friday Harbor, Washington, was used as the field 

 experimental platform; it was instrumented to record the incident and trans- 

 mitted waves, mooring line forces, and the acceleration components of sway, 

 heave, and roll. Ninety- five 17-minute records were obtained during the period 

 30 December 1974 to 5 May 1975. Statistical summaries of all data are presented 

 with analyses of selected transmitted waves, transmission coefficients, and 

 acceleration components. The summaries and analyses constitute a performance 

 report of a particular floating breakwater as well as an input to the develop- 

 I ment of the theoretical model. 



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