This is the relationship on which the experimental program was based. 

 Similarly, consider the mooring-force relationship to be 



F = f(H,H t ,L, B,D,G,A,m, k,e, d,y,v,g) 



and, by similar reasoning, obtain 

 F 



YlF 



/L H D B\ 



= f - , ~ , T , -) 



\B L d D/ 



(5) 



2. Data-Reduction Procedures . 



Analog signals from the wave gages and force transducer were recorded on 

 three channels of a six-channel Brush oscillographic recorder. Typical 

 records of the seaward mooring-line force and the incident and transmitted 

 waves are reproduced in Figures 29 to 32. 



Wave reflections from the steep, rock-armored beach at the end of the wave 

 tank (Fig. 18) were an annoyance, particularly for the longer waves generated. 

 The incident and transmitted wave heights were therefore generally obtained 

 from the first 5 to 10 waves in the run (i.e., before wave reflections could 

 substantially influence wave height measurements. Beach reflections were 

 particularly bothersome when generating waves of low steepness and of periods 

 larger than about 5 seconds. 



From the force gage records it can be seen that the seaward mooring load 

 fluctuates with the passage of each wave between a maximum value, which varies 



Figure 29. Wave and force record for long waves (d = 4.7 m, T = 8.0 s) . 



34 



