b. Wave Reflection . The reflection coefficient, K^, data deter- 

 mined by the manual and automated methods are given in Table 6. The two 

 methods are described in Volume I. A plot of K^ versus time (Fig. 1) 

 comparing the two methods, indicates that both methods show the same time 

 variation in Kn- A scatter plot (Fig. 2) of K^ values for the manual 

 method versus the automated method, for those wave records reduced by 

 both methods, shows that the manual values were higher than the automated 

 values by an average of 0.05, and that the variation did not increase with 

 increased reflection. 



All K^ data versus time are plotted in Figure 3, with the manual 

 values reduced by 0.05 to give a single curve. For the first 25 hours 

 the Kp was 0.10 or below. After 25 hours the Kp increased in mean 



^i? 



value and in variability, reaching as high as 0.18 at 35 hours and 0.27 

 at 115 hours, and as low as 0.07 at 135, 140, and 150 hours. 



Values of K^ in the fixed-bed tank as determined by the automated 

 method (Table 6) varied from 0.04 to 0.07. At times of high K^ in the 

 movable-bed tank (at 30, 35, 40, 105, 110, and 120 hours) the K^ in the 

 fixed-bed tank varied within the range of 0.05 to 0.07, indicating that 

 the high K^ in the movable-bed tank was not caused by a change in gen- 

 erator operation. The 0.03 variation of K^ in the fixed-bed tank 

 indicates that variation in K^ greater than ±0.015 in the movable-bed 

 tank can be attributed to changes in the movable-bed profile. 



The K^ values determined in the. inshore zone, which represent the 

 reflection from the foreshore zone, are shown in Table 7. The average 



varied from 0.06 to 0.12. 

 Table 7. 



Reflection coefficients in 

 the inshore zone of the 

 movable-bed tank. 



Time 

 (hr) 



K«^ 



Avg 





torige 









1 



5 



5 





101 



0.11 



0.10 



0.10 



0.10 



105 



0.10 



0.09 



0.17 



0.12 



126 



0.09 



0.06 



0.04 



0.06 



130 



0.09 



0.09 



0.11 



0.10 



152 



0.08 



0.13 



0.13 



0.11 



155 



0.10 



0.07 



0.08 



0.08 



•^Data reduced by the manual method; 

 values reduced by 0.05 using Figure 

 2 to calibrate the manual method 

 against the automated method. 



2. Profile Surveys . 



a. Interpretation of Contour Movement Plots. The profile surveys 

 (discussed in Vol. I) measured the three space variables of onshore- 



15 



