Table 1 



Vessel Traffic During 30 September - 01 October 1997 Field-Data Collection 



Type 



Approximate 

 Length 



Direction 



Date/Time 



Waves' 



Ship-barge pushed by 

 tuq 





North 



9/30—9:333 



None noticed 



Freighter 





North 



9/30—9:433 



None noticed 



Freighter 





North 



9/30—11:183 



None noticed^ 



Ship-barge/freighter? 





South 



9/30— 12:02p 



None noticed 



Freighter 





North 



9/30— 12:37p 



None noticed 



Freighter 





South 



9/30— 3:1 7p 



Near breaking, reflected waves and overtop 

 @ 3 min after passage 



Freighter 





North 



9/30— 3:49p 



Slight increase in w3ve chop 



Freighter 





South 



9/30^1:05p 



Slight incresse in W3ve chop 



Recreational boat 



15-18ft 



North 



10/1— 8:47a 



Bo3t wake interaction with exiting reflected waves 

 at basin entrance 



USCG vessel 



100 ft 



South 



10/1-9:323 



Vessel wake and reflected waves interacted to 

 cause breaking just inside basin 



USCG vessel 



100 ft 



South 



10/1-11:253 



None noticed, waves too choppy 



Ship-barge pushed by 

 tug 





North 



10/1— 11:45a 



None noticed, waves too choppy 



Freighter 



large 



South 



10/1— 12:07p 



Interior wave breaking, trapped wave overtopping 

 towards st3tion 



Freighter 



500 ft 



South 



10/1— 12:38p 



None noticed, waves too choppy 



Freighter 



200 ft 



South 



10/1— 12:43p 



None noticed, waves too choppy 



Freighter 





North 



10/1— 1:16p 



None noticed, waves too choppy 



Ship-barge pushed by 

 tug 





North 



10/1— 2:20p 



None noticed, waves too choppy 



Recreation/work boat 





South 



10/1— 2:49p 



None noticed, waves too choppy 



' Inside boat basin. 



^ Waves not noticeable; while Detroit District vessel was moored near center of basin, strong currents pulled it toward the 

 entrance when freighter bow was even with basin, and strong currents pushed Detroit District vessel away from entrance when 

 freighter stern was even with basin. 



worst in-basin wave activity. Unfortunately, neitiier 30 September nor 1 October 

 were ideal to observe vessel-generated waves because easterly and northeasterly 

 winds continuously generated short-period waves that distorted any vessel- 

 generated waves. 



20 



Chapter 3 Field-Data Collection 



