Three data presentation formats are presented in Figures 22 through 24. 

 Figure 22 indicates the number of times a certain speed was observed 

 during the 28-day cycle. Figure 23 shows direction and speed of 

 current flow, in polar coordinates, and Figure 24 presents the same 

 data in a scattergram. 



Current velocities were computed by plotting compass and vane 

 readings with speeds obtained from rotor readings. Velocity vectors 

 for a 15-day period, covering the last-quarter and new moons, were 

 summed in the x-y directions, and a resultant was obtained. At 30 

 meters, the overall velocity was 9 cm/sec at 122° True, and at 55 

 meters, the velocity was 7.5 cm/sec at 131° True. 



Figures 25 and 26 present data obtained from the current meters. 

 The figures show velocity components in the north-south and east- 

 west directions, time of the particular phase of the moon, and computed 

 tides. These figures also show relationships between speed and direction 

 of the current, phases of the moon, and tides. Velocity components 

 periodically cross the north-south and east-west zero vector lines, 

 thus illustrating the rotational effect of tides on current direction. 



The highest tides and greatest current speeds were found near 

 the time of new moon. At that time, regular tides of uniform period 

 and height variations and systematic current rotations were occurring. 

 During full moon, tides were nearly regular, but not as high as those 

 at new moon. Corresponding to this decrease in tide height was a 

 lessening of current speed; rotation was rapid and systematic during 

 this period. Irregular tides occurred at the first- and last-quarter 

 moons . 



The greatest dissimilarity between the current existing during 

 the quarter moons and those of the new and full moons was that the 

 current flowed in one direction for a much longer period of time 

 during the quarter moons. Or, the current at the full- and new- 

 moon periods rotated in a continuous clockwise direction; whereas, 

 at the quarter-moon periods, the current oscillated between a clockwise 

 and counterclockwise direction, not always completing a 360° rotation. 

 Also, at the new- and full-moon periods, current flow rotated in 

 a clockwise direction more consistently at 30 meters than near the 

 bottom at 55 meters. 



Based on the relationships discussed above, the following conclusions 

 are made: (1) tides were regular a few days before until a few days 

 after both the full and new moons; (2) tides were irregular a few 

 days before until a few days after both the first- and last-quarter 

 moons; (3) highest tides were found at the time of new-moon; (4) 

 highest current velocities were found at new moon during the ebb; 

 (5) currents rotated in a clockwise direction during new and full 

 moons; (6) as depth increased, the trend of the current to rotate 

 in a clockwise direction lessened; and (7) current direction alternated 



24 



