CO 



PROFILE II. 



PROFILE III. 



POINT OF DYE RELEASE 



Figure 3. Positions of the three profiles shown in Figure 2 and of the 

 subsurface dye injections made on the habitat. 



The deployment of both of these investigations was designed to provide 

 preliminary information on the usefulness of underwater photography of 

 dyes to delineate subsurface flow fields. Thus the cursory nature of the 

 experiments was inherent in their design. 



Results: The flow patterns observed around the TEKTITE II habitat were 

 pronoimced even though the flow velocities in the vicinity of the habitat 

 were extremely low. Streamlined flow was observed to occur near the 

 vertical cylindrical portions of the habitat. The low velocity flow was 

 quite turbulent close to the cylinders and may reflect the effect of 

 thermal diffusion set up by the habitat. The streamlined flow broke off 

 abruptly when it reached the main direction of current efflux from the 

 area. Turbulent flow was experienced near the stagnation point of the 

 down current side of the cylinders. In the area between the two vertical 

 cylinders, extremely turbulent flow was observed and some vertical upwell- 

 ing and overturning was noted. Flow around the base of the habitat was 

 abrupt and followed the contour of the platform to the point of current 

 efflux from the area. 



The aerial photographic investigation was not conclusive in establishing 

 any three dimensional diffusion patterns. The low velocity coastal 

 currents failed to show any micro-turbulent edge structure in the aerial 

 photographs. Likewise only two of the aerial photographs showed sufficient 

 contrast between the dye and the ocean surface to be useful in the study. 



VII -51 



