TM No, 327 



During the first 36 hours of tracking, drogue Victor (lO meters) traversed 

 a cyclonic path (radius about 7 kilometers), then coursed generally southward 

 during the remainder of the tracking time„ 



Two drogues vere set at 200 meters, drogue 2 to the north and drogue 3 

 to the south of drogue Victor, They exhibited a general southward motion 

 somewhat comparable to that of drogue Victor, (See figure 30 Drogue 2 

 exhibited a remarkably high speed during the second 12~hour period. This was 

 probably due to a temporary loss of signal by the Decca receiver. 



Two drogues were set at 6OO meters, drogue 8 to the north and drogue k to 

 the south of drogue Victor. The motions of the drogues were quite different 

 from each other. Drogue k moved northward, during the first 12 hours of 

 tracking, then moved abruptly toward the west during the last ik hoiors of 

 tracking. Drogue 8 was set before drogue U. During the first 12 hours of 

 tracking, drogue 8 moved northward, then abruptly reversed its track and moved 

 southward during the remaining tracking time. Thus, over the seune time inter- 

 val, the two 600 meter drogues were moving in opposite directions. (See figure 



Three drogues were set at I5OO meters (southern part of the channel). 

 Drogues X-ray and Yankee showed a net southerly mot ion, while drogue Zebra 

 showed a net easterly or out-channel motion. This difference in direction by 

 drogue Zebra appears to be a boundary effect caused by the proximity of the 

 banks. (See figure 5») 



The motion of nearly all the drogues along Tl indicated a net flow into the 

 Northeast Providence Channel at all depths. The only exception was drogue Zebra 

 (1500 meters), which had an average speed of 8,2 cm/sec toward 07^°T. 



If the Northeast Providence Channel is arbitrarily divided into two equal 

 parts by a line parallel to the long axis of the channel (figure l), it will 

 be noted that the drogues in the northern part of the channel had higher ranges 

 of speed, and thus higher average speeds, than the drogues in the southern 

 part of the channel. In either case, current speed generally decreased with 

 increasing depth. 



The direction of six of the eight drogues (between l63°T and 208°T) was 

 toward the bank between New Providence Island and Northern Eleuthera. This 

 bank forms the southern boundary of the channel. The motion of the drogues 

 indicates that the flow between the Northeast Providence Channel (Tl) and an 

 area closer to the Tongue (T2) is not simple, and that it may be a complex 

 system of eddies resulting from the bounding bank acting aS|.a barrier to the 

 flow. 



Some of the position fixes taken close together in time appeared to be in 

 error, resulting in extremely high current speeds, especially for drogues 2 

 and 8 located in the northern part of the Northeast Providence Channel. (See 



6 



