1 Selected Port Huron Experimental Wave Conditions 



11 Deg 



59 Deg 



4-sec, 0.61 -m (2-ft) 



4-sec, 0.61 -m (2-ft) 



6-sec, 1 .22-m (4-ft) 



5-sec, 1 .22-m (4-ft) 



7.9-sec, 2.07-m (6.8-ft) 



6-sec, 1.86-171(6.1 -ft) 



8.6-sec, 2.62-m (8.6-ft) 



6.5-sec, 2.35-m (7.7-ft) 



9.2-sec, 3.02-m (9.9-ft) 



7-sec, 2.68-m (8.8-ft) 



Unidirectional wave spectra were generated based on TMA parameters for the 

 selected waves and used throughout the model investigation. Plots of a typical 

 wave spectra are shown in Figure 19. The dashed line represents the desired 

 spectra, while the solid line represents the spectra reproduced in the model. A 

 generic TMA gamma function of 3.3 was used to determine the spread of the 

 spectra. The larger the gamma value, the sharper the peak in the energy- 

 distribution curve. A typical wave train time series is shown in Figure 20, which 

 depicts water-surface elevation versus time. Selected waves were defined by 

 significant wave height, the average height of the highest one-third of the waves 

 or Hs. In deepwater, Hs is very similar to //„„ (energy-based wave) where H^o = 4 

 (Ef'^, and E equals total energy in the spectra, which is obtained by integrating 

 the energy density spectra over the frequency range. 



Riverflows. The St. Clair River flows southerly from Lake Huron to 

 Lake St. Clair. Based on the prototype data obtained during September 1997, 

 riverflow magnitudes in the St. Clair River were 2.1 mps (6.9 fps) immediately 

 inside the river mouth north of the bridge to Canada. These river current 

 magnitudes were reproduced in the model and used during model experiments 

 with flow conditions. 



Analysis of model data 



Relative merits of the various improvement plans were evaluated by the 

 following: 



a. Comparison of wave heights at selected locations in the model. 



b. Comparison of wave-induced current patterns and magnitudes. 



c. Comparison of sediment-tracer movement and subsequent deposits. 



d. Visual observations and wave-pattern photographs. 



In the wave-height data analysis, the average height of the highest one-third of 

 the waves (Hs), recorded at each gauge location, was computed. All wave heights 



Chapter 6 Physical Model 



39 



