* SINGLE CHANNEL FREQUENCY DOMAIN ANALYSIS (PAGE 2) 



* 6 FT SCOUR TESTS, SPECTRAL, ST14W05A 



DATA CHANNEL 4 TIME STEP = . 5000E-01 NUMBER OF TIME STEPS - 3200 BANDS AVERAGED - 10 PLOTTED RESULTS? YES 

 DETREND MODE - 1 (MEAN REMOVED) WINDOW MODE - 1 (COSINE SQUARED) 10% OF RECORD TAPERED AT EACH END 



DETREND FUNCTION = (-0 . 1542E-01) + ( O.O0OOE+O0)*T + ( . OOOOE+00) • (T«*2) FREQUENCY LIMITS 0.2000 TO 10.00 



SPECTRAL PARAMETERS 



FPC = 0.4500 EMO = 0.2587E-01 FPS = 0.4500 



TPC =2.222 EMI - 0.1387E-01 TPS = 2.222 



HMO - 0.6434 EM2 - 0.8437E-02 FPD • 0.4500 



QPG - 3.200 T02 - 1.751 TPD - 2.222 



DATA CHANNEL 5 TIME STEP = 0.5000E-01 NUMBER OF TIME STEPS - 3200 BANDS AVERAGED - 10 PLOTTED RESULTS? YES 

 DETREND MODE = 1 (MEAN REMOVED) WINDOW MODE - 1 (COSINE SQUARED) 10% OF RECORD TAPERED AT EACH END 



DETREND FUNCTION = (-0 . 1591E-01) + ( . OOOOE+00) *T + ( . OOOOE+00) * (T»*2) FREQUENCY LIMITS 0.2000 TO 10.00 



SPECTRAL PARAMETERS 



FPC = 0.4375 EMO - 0.2594E-01 FPS = 0.4500 



TPC - 2.286 EMI - 0.1389E-01 TPS = 2.222 



HMO • 0.6443 EM2 - 0.8437E-02 FPD - 0.4500 



QPG - 3.036 T02 - 1.754 TPD - 2.222 



DATA CHANNEL 6 TIME STEP = 0.5000E-01 NUMBER OF TIME STEPS - 3200 BANDS AVERAGED » 10 PLOTTED RESULTS? YES 

 DETREND MODE = 1 (MEAN REMOVED) WINDOW MODE - 1 (COSINE SQUARED) 10% OF RECORD TAPERED AT EACH END 



DETREND FUNCTION = (-0. 1590E-01) + ( 0. OOOOE+00) *T + ( O.OOOOE+00) * (T**2) FREQUENCY LIMITS 0.2000 TO 10.00 



SPECTRAL PARAMETERS 



FPC = 0.4375 



TPC = 2.286 



HMO - 0.6691 



QPG - 3.373 



EMO - 0.2798E-01 



FPS = 



0.4125 



EMI . 0.1467E-01 



TPS - 



2.424 



EM2 - 0.8697E-02 



FPD - 



0.4219 



T02 - 1.794 



TPD - 



2.370 



Figure A3. Example of single channel frequency (Jomain analysis (nearshore array) 



coefficients. The Coastal Engineering Research Center (CERC)/GODA three probe analysis for surface 

 wave incidence and reflection is used to separate incident waves from reflected waves and calculate the 

 reflection coefficient (Figure A4). 



Remarks About Wave Analysis Results 



7. The experiments described in this report attempted to follow the wave-generating procedures used 

 in the large-scale tests conducted in the Grofier Wellenkanal (GWK) in Germany. In the regular wave 

 tests, this involved running wave bursts of up to 80 waves. Calibration before testing commenced indicated 

 that this condition would keep the reflected wave components less than 20 percent, just as was done in the 

 GWK tests. Examination of reflection coefficients calculated from data measured at the gage array closest 

 to the wave board (Appendix B) reveals that this condition was reasonably met. 



8. However, wave nonlinearities at the nearshore gage, combined with reflection from the profile (and 

 sometimes the exposed revetment) acted to transform the nearshore wave field into a less than ideal set of 

 regular waves. This is illustrated by Figure A5, which presents a typical wave times series from a 



A4 



