Typical wave patterns obtained for existing conditions also are shown in 

 Photos 18-33. 



Results of vessel-wake experiments with existing conditions installed are 

 presented in Table 8. As noted from these results, the smaller 27-m- (90-ft-) long 

 vessel moving at the greatest speed (15 knots) resulted in the largest waves in the 

 harbor. Maximum waves also occurred as the vessel entered the St. Clair River 

 (as opposed to the vessel leaving the river). Views of the model vessels leaving 

 the St. Clair River and their resulting wakes are shown in Photos 34-37. 



Improvement plans. The general movement of tracer material and 

 subsequent deposits for Plans 1-8 are shown in Photos 38-60 for representative 

 waves from 11 deg with the +1.07-m (-i-3.5-ft) swl with riverflow conditions. As 

 for existing conditions, the tracer material was exposed to 6-sec, 1.22-m (4.0-ft) 

 waves for 40 min and then to 7.9-sec, 2.07-m waves for 5 min; however, if 

 shoaling had not occurred in the entrance after this time frame, the plan was 

 exposed to the larger wave for an additional 15 min. Results revealed that minor 

 deposits occurred in the entrance for Plan 1 after the initial 45 -min condition 

 (Photo 39). For Plan 2, no shoaling occurred in the entrance after 45 min, but 

 minor tracer deposits were observed after 60 min (Photo 42). Some of the 

 material observed in Photo 42 came over the structure because of overtopping 

 waves. Plans 3 and 4 resulted in essentially no deposits in the entrance after the 

 60-min condition (Photos 45 and 48). The light traces of sediment material in 

 these photos occurred because of overtopping. Experiments for Plan 5 revealed 

 deposits in the entrance after 60 min (Photo 51); however. Plans 6 and 7 

 experienced essentially no shoaling for the 60-min condition (Photos 54 and 57). 

 Results of the Plan 8 experiments indicated significant deposits in the entrance for 

 the 60-min condition (Photo 60). 



Results of wave height experiments for Plans 1-8 are presented in Table 9 for 

 representative waves from 11 deg for the +1.07-m (+3.5-ft) swl with riverflow 

 conditions. Maximum wave heights obtained were 0.82, 0.88, 0.88, 0.79, 0.67, 

 0.64, 0.70, and 0.61 m (2.7, 2.9, 2.9, 2.6, 2.2, 2.1, 2.3, and 2.0 ft) in the harbor 

 entrance (Gauge 1); 0.73, 0.73, 0.70, 0.67, 0.61, 0.55, 0.55, and 0.43 m (2.4, 2.4, 

 2.3, 2.2, 2.0, 1.8, 1.8, and 1.4 ft) in the southwest portion of the harbor (Gauge 3); 

 0.67, 0.67, 0.67, 0.58, 0.49, 0.49, 0.49, and 0.43 m (2.2, 2.2, 2.2, 1.9, 1.6, 1.6, 

 1.6, and 1.4 ft) in the northwest portion of the harbor (Gauge 4); and 0.58, 0.64, 

 0.67, 0.55, 0.46, 0.46, 0.49, and 0.40 m (1.9, 2.1, 2.2, 1.8, 1.5, 1.5, 1.6, and 

 1.3 ft) along the existing dock (Gauge 5) for Plans 1-8, respectively. For 1.22-m 

 (4.0-ft) incident waves, wave heights were 0.30, 0.27, 0.27, 0.24, 0.24, 0.21, 0.21, 

 and 0.18 m (1.0, 0.9, 0.9, 0.8, 0.8, 0.7, 0.7, and 0.6 ft) in the entrance; 0.21, 0.21, 

 0.21, 0.21, 0.21, 0.18, 0.18, and 0.12 m (0.7, 0.7, 0.7, 0.7, 0.7, 0.6, 0.6, and 

 0.4 ft) in the southwest portion of the harbor; 0.18, 0.18, 0.18, 0.15, 0.15, 0.15, 

 0.15, and 0.12 m (0.6, 0.6, 0.6, 0.5, 0.5, 0.5, 0.5, and 0.4 ft) in the northwest 

 portion of the harbor; and 0.34, 0.34, 0.30, 0.24, 0.27, 0.24, 0.24, and 0.12 m 

 (1.1, 1.1, 1.0, 0.8, 0.9, 0.8, 0.8, and 0.4 ft) along the dock. Typical wave patterns 

 for Plans 1-8 are shown in Photos 61-76 for representative waves with the 

 +1.07-m (-(-3.5-ft) swl with riverflow conditions. 



Chapter 6 Physical Model 47 



