TM No. 327 



The motion of drogue Yankee II during the first seven hoiors of tracking 

 was generally toward the north at an average speed of 2U.8 cm/sec. Yankee II 

 then veered to the west, exhibiting a sawtooth pattern during the next 7-8 

 hours with an average speed of 8.6 cm/sec. These curious fluctuations were 

 probably real^ since the accuracy of the Decca Hi-Fix was considered, less 

 than the amplitude of the sawtooth fluctuations. During the remaining period 

 of tracking^ Yankee II moved toward the west-southwest at an average speed of 

 10.9 cm/sec. 



Drogue Charlie moved north-northwest during the first seven hours of 

 tracking at an average speed of 25.5 cm/sec^ then gradually veered to the 

 west. Diiring the period from 2038 to 23OI on 28 February (when the drogue was 

 turning to westward)^ the speed decreased from 16.8 to 10.0 cm/sec. The 

 average speed during the remaining tracking time was 8.9 cm/sec. 



After the delay in tracking,, drogue Charlie C^i^^^ drogue Kilo) was located 

 at nearly the same position it was in some U8 hours earlier, (See figure 13.) 

 Note also the similarity of track plots for drogues Charlie and Yankee II. 



In general; the three drogues showed remarkable similarity with respect to 

 direction, but less so with respect to speed. Figure 1^ shows the average 

 speed of the three drogues over the same time interval. There was an 

 increasing horizontal current (speed) gradient from drogue Kilo to drogue 

 Charlie, and throughout each individual drogue track there was considerable 

 variability with respect to speeds. However, there appear to be three distinct 

 forms of motion over particular time intervals (indicated by the drogue tracks) 

 during which the speeds were relatively uniform. Note also the apparent 12- 

 hour periodicity In the speed, and the phase difference for the three drogues 

 (figure 13), 



The subsequent detailed analysis of these data should shed some light on 

 the turbulent mixing and transport of bank water in the AUTEC area. 



Transect 5 



Four drogues were set at various depths and tracked along transect 5 

 (T5 in figure l). The drogue history and data sheets are included in 

 appendix A, Table 6 is a summary of the drogue data obtained along T5. 



13 



