PI6 = L If 



0-' 



The regression model that provided the best fit to the remaining data is 

 given below. The model was weighted by deepwater wavelength. 



Q' = 0.035883 - 0.010479*P/1 + 0.005523*^/1^ 



- 0.003424*/'/2 + Om\962*PI2^ 



- 0.004667*P/4 + 0.000142*P/42 



+ 0.000230*/'/52 + 0.000000536*P/5'^ 



+ 0.0000681 28 *P/6 - 0.000000290*P/62 



This model had a correlation coefficient of 0.976 (R^ = 0.952). The sum 

 of squares of differences between predicted and measured dimensional 

 overtopping rates was 0.887, which, for 98 data points, yielded an average 

 difference of ± 0.095 cfs/ft. 



As with all regression models presented in this report, this model is 

 only valid for the range of conditions tested and is site specific for Revere 

 Beach. The range of variables, both dimensional and nondimensional, 

 used in this analysis is given in Table 14. 



Table 14 



Minimum and Maximum Values for Parameters Used in 



Regression Analysis of Combined Data from Tasks A, B, 



and C 



Parameter 



Min 



Max 



SWL, ft mlw 



9.5000 



16.6000 



Wave height, ft 



3.1000 



12.6500 



Wave period, sec 



8.1000 



15.9000 



Seawall freeboard, ft 



3.2000 



11.5000 



Freeboard between seawall 

 and beach, ft 



0.4000 



11.8000 



Cotan beach slope 



10.7000 



19.5000 



Overtopping rate, cfs/ft 



0.0000 



1.3553 



P/1 



0.0374 



2.6818 



P/2 



0.3298 



2.7188 



P/4 



10.7000 



19.5000 



P/5 



0.8261 



5.1875 



Pie 



33.0292 



404.8744 



a 



0.0000 



0.0256 



Chapter 3 Research Tasks A, B, and C 



43 



