0.0 



20. 



ZO. 



40. 



50. 60. 70. 80. 



Time (sec) 



100. 110. 120. 130. 



Figure Al. Irregular wave surface elevation time series 



DOWNCROSSISG ANALYSIS (PAGE 1) 

 6 FT SCOUR TESTS, SPECTRAL, ST14W05A 



TIME STEP = 0.5000E-01 NUMBER OF TIME STEPS CONSIDERED 



ANALYSIS DATE 5-OCT-89 

 ANALYSIS TIME 1356 

 3200 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE = RECORD MEAN 



DATUM VALUE - -0.9802E-02 PLOTTED RESULTS? NO 



. 9802E-02 



.1817 



.1818 



ETAMIN 

 ETAMAX 

 RHOHH 



.6102 

 .5708 

 .4561 



T 1/3 

 TBAR 

 RHOHT 



2.092 

 1.869 

 0.5770 



H 1/3 

 HEAR 

 HMAX 



0.6750 

 0.4531 

 1.168 



WEIBULL ALPHA = 1.7 62 

 WEIBULL BETA =■ 0.5812 

 NUMBER OF WAVES = 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE = RECORD MEAN 



DATUM VALUE = -0.1347E-01 PLOTTED RESULTS? 



ETAMIN 

 ETRMAX 

 RHOHH 



-0.6015 

 0.6915 

 0.4665 



T 1/3 = 2.101 

 TBAR = 1.909 

 RHOHT = 0.4796 



H 1/3 - 

 HBAR = 

 HMAX = 



PLOT MODE ■= 



WEIBULL ALPHA = 2.213 

 WEIBULL BETA - 0.4916 

 NimBER OF WAVES = 83 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE - RECORD MEAN 



. 1312E-01 



.1836 



.1836 



ETAMIN = 

 ETAMAX = 

 RHOHH = 



-0.5239 

 0.6761 

 0.3986 



DATUM VALUE = -0.1312E-01 PLOTTED RESULTS? 



T 1/3 

 TBAR 

 RHOHT 



2.105 

 1.909 

 0.4652 



H 1/3 

 HBAR 

 HMAX 



.6986 

 .4655 

 1.200 



PLOT MODE = 



WEIBULL ALPHA = 2.112 

 WEIBULL BETA = 0.5092 

 NUMBER OF WAVES = 83 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE = RECORD MEAN 



.1542E-01 



.1642 



.1642 



ETAMIN 

 ETAMAX 

 RHOHH 



DATUM VALUE = -0.1542E-01 PLOTTED RESULTS? NO 



PLOT MODE 



T 1/3 = 

 TBAR = 

 RHOHT = 



2.048 

 1.931 

 .3515 



H 1/3 

 HBAR 

 HMAX 



.6456 

 .4191 

 .9490 



WEIBULL ALPHA = 2.181 

 WEIBULL BETA = 0.4931 

 NUMBER OF WAVES " 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE = RECORD MEAN 



.1591E-01 



.1645 



.1645 



ETAMIN 

 ETAMAX 

 RHOHH 



.3691 

 .6439 

 .4536 



DATUM VALUE = -0.1591E-01 PLOTTED RESULTS? 



PLOT MODE = 



T 1/3 = 

 TBAR " 

 RHOHT - 



2.048 

 1.907 

 .3731 



H 1/3 

 HBAR 

 HMAX 



.6361 

 .4147 

 .9250 



WEIBULL ALPHA = 

 WEIBULL BETA = 

 NUMBER OF WAVES 



DATA CHANNEL 



ETABAR 

 ETARMS 

 ETASD 



CROSSING MODE - RECORD MEAN 



DATUM VALUE = -0.1590E-01 PLOTTED RESULTS? 



.1590E-01 



.1695 



.1695 



ETAMIN = -0.4021 

 ETAMAX « 0.64 99 

 RHOHH = 0.3991 



T 1/3 = 

 TBAR = 

 RHOHT = 



2.150 

 1.955 

 0.3108 



H 1/3 » 0.6674 

 HBAR = 0.4221 

 HMAX = 0.9410 



PLOT MODE 



WEIBULL ALPHA " 1.715 

 WEIBULL BETA = 0.5704 

 NUMBER OF WAVES = 



Figure A2. Example of single channel downcrossing analysis 



A3 



