Figure 15B shows two plumes moving rapidly toward 150° with speeds 

 up to 0.40 meters per second. In figure 15C the main patch has 

 caught up with the plumes. In figure 15D a large diffused plume 

 again projects from the main dye patch. These photographs suggest 

 turbulent flow accompanied by near-surface jets. 



Data recorded at ARGUS ISLAND during this period are shown in 

 appendix A. The values averaged over the hour following dye release 

 were: wind toward 150° at 7*7 m/sec, current at 8-meter depth toward 

 210° at 0.20 m/sec, and current at 30 meters toward 130° at 0.12 m/sec. 



Judging from the area of greatest concentration, the set of the 

 dye patch was initially toward the southeast. Within 30 minutes, how- 

 ever, the direction had changed slightly and the patch drifted more 

 southward. The initial set of the dye patch was apparently due to 

 wind action on the surface layer of water. After the dye diffused 

 downward it began to move more in agreement with currents at the 8- 

 meter depth. 



The area and concentration of the dye patch determined from photog- 

 raphy are shown in figure 16. Appropriate least-squares regression 

 lines are also shown. The areas were determined from aerial photog- 

 raphy, and concentrations were measured from the boat. The area increased 

 linearly during the 5-hour period; concentration decreased as the nega- 

 tive 2.5 power of time. 



Figure 1 6 Characteristics of Dye Patch as a 

 Function of Time 



26 



