Table 8 



Wave Heights for Existing Conditions for Boat Waves, swi = +3.5 ft (No Flow 



Conditions) 



Boat Type 

 Direction 



Wave Height, ft, at Indicated Gauge Location 



Gauge 1 



Gauge 2 



Gauge 3 



Gauge 4 



Gauge 5 



Gauge 6 



90-ft Speed boat 

 Leaving St. Clair River 

 Entering St. Clair River 



0.7 

 2.6 



0.2 

 1.5 



0.4 



1.8 



0.2 

 0.5 



0.4 

 0.7 



0.4 

 0.6 



100-ft Cabin cruiser 

 Leaving St. Clair River 

 Entering St. Clair River 



0.4 

 0.5 



0.2 

 0.5 



0.1 

 0.2 



0.3 

 0.1 



0.2 

 0.1 



0.3 

 0.1 



600-ft Ore carrier 

 Leaving St. Clair River 

 Entering St. Clair River 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.2 



690-ft container vessel 

 Leaving St. Clair River 

 Entering St. Clair River 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.1 



0.1 

 0.2 



0.1 

 0.1 



The general movement of tracer material and subsequent deposits for repre- 

 sentative waves from 11 deg are shown in Photos 77-88 for Plan 9. 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 (6.8-ft) waves for 20 min. An intermediate photo was taken after 

 exposure to 6-sec, 1.22-m (4.0-ft) waves for 40 min and 7.9-sec, 2.07-m (6.8-ft) 

 waves after 5 min for a direct comparison of the experiments conducted for exist- 

 ing conditions. In general, tracer material moved southerly along the shoreline 

 and was diverted lakeward around the entrance by the Plan 9 breakwater con- 

 figuration as it moved downstream. Sediment accumulations were not observed 

 in the entrance for any of the experimental conditions. With no riverflow condi- 

 tions, it was noted that some material moved over the breakwater because of 

 overtopping and settled in the northeast comer of the harbor. The general move- 

 ment of tracer material and subsequent deposits for Plan 9 for representative 

 waves from 59 deg are presented in Photos 89-96. Tracer material was exposed to 

 5-sec, 1.22-m (4.0-ft) waves for 10 min and then 6-sec, 1.86-m (6.1 -ft) waves for 

 5 min. These experiments corresponded to those of existing conditions. Tracer 

 material migrated lakeward with no flow conditions with no material depositing 

 near the harbor entrance. With riverflow conditions, however, material moved 

 southerly around the head of the north breakwater, but did not deposit in the 

 entrance. Only slight deposits occurred in the harbor because of wave 

 overtopping of the structure with riverflow conditions. 



Wave-height experiments conducted for Plan 9 are presented in Tables 10 and 

 1 1 for no flow and riverflow conditions, respectively. For the 1 1 deg direction, 

 maximum wave heights were 1.07 m (3.5 ft) in the harbor entrance (Gauge 1); 

 0.79 m (2.6 ft) in the southwest portion of the harbor (Gauge 3); 0.73 m (2.4 ft) in 

 the northwest portion of the harbor (Gauge 4); and 0.76 m (2.5 ft) along the 

 existing dock (Gauge 5) all for 9.2-sec, 3.02-m (9.9-ft) waves with the +1.07-ft 



48 



Chapter 6 Physical Model 



