(Texel-MARSEN-ARSLOE) spectral transformation of waves, with no additional 

 energy input from wind, and straight and parallel bottom contours. Wave 

 sheltering from nearby land masses and shoals also can be determined. 



Deepwater wave hindcast data from two angle classes were considered for 

 transformation to shallow-water values at Port Huron. Angle class 1 consisted of 

 waves approaching from 348.5 to 33.5 deg, and angle class 2 entailed waves 

 approaching from 33.5 to 78.5 deg. Results indicated that waves from angle class 

 1 were, by far, predominant. Approximately 91 percent of the wave occurrences 

 were noted in angle class 1 . Waves from 1 1 deg and 59 deg were determined to 

 be representative of angle classes 1 and 2, respectively. 



Selection of experimental waves. Based on the transformation of hindcast 

 data from Sta 1, the following conditions were selected as representative of waves 

 lakeward of Port Huron (approximate location of wave generator in model) during 

 boating season and for the entire year. 



Navigation Season (Apr-Oct) 



All Year || 



Return Period, year 



Wave Length, m (ft) 



Return Period, year 



Wave Height, m (ft) || 



11 Deg II 



2 



2.07 (6.8) 



2 



2.13(7.0) 



5 



2.29 (7.5) 



5 



2.29 (7.5) 



10 



2.47(8.1) 



10 



2.53 (8.3) 



20 



2.62 (8.6) 



20 



2.68 (8.8) 



25 



2.68 (8.8) 



25 



2.74 (9.0) 



50 



2.83 (9.3) 



50 



2.93 (9.6) 



100 



3.02 (9.9) 



100 



3.08(10.1) 



59 



Deg 





2 



1.86(6.1) 



2 



1 .92 (6.3) 



5 



2.04 (6.7) 



5 



2.10(6.9) 



10 



2.19(7.2) 



10 



2.26 (7.4) 



20 



2.35 (7.7) 



20 



2.41 (7.9) 



25 



2.41 (7.9) 



25 



2.47(8.1) 



50 



2.56 (8.4) 



50 



2.62 (8.6) 



100 



2.68 (8.8) 



100 



2.77(9.1) 



Since the Port Huron marina is used only during boating season, wave heights 

 associated with 2-, 20-, and 100-year return periods during navigation season were 

 selected for model experiments. Wave periods associated with these wave heights 

 (based on the hindcast) were used as shown in the following tabulation. Note also 

 that smaller wave conditions were selected to represent more normal occurrences 

 (those with less than a 2-year return period). 



38 



Chapter 6 Physical Model 



