The subsurface photographs showed ssme development of vertical edge 

 structure, but the photographs also lacked good definition of the dye plume, 

 No significant results on the three dimensional photographic study are 

 available at this time. However, photographic enhancement techniques may 

 supply further information from this study. 



Conclusions/Recommendations: The utilization of underwater photography 

 is potentially one of the most effective techniques which could be 

 developed for studying subsurface flow. The initial experiments 

 conducted during the TEKTITE II program showed that even low velocity 

 flow structure can be easily and economically monitored with photography 

 of subsurface dye releases. The potential applications of this technique 

 are: to study boundary layer flow around submerged piles and structures; 

 to investigate the boundary layer structure over bottom sediments and 

 bottom features; and to study the vertical structure of currents and 

 their vertical mixing processes. 



An extremely important aspect of subsurface dye photography is its 

 expanded potential when used by habitat divers. Saturation diving would 

 provide the critical bottom time required to throughly map the afore 

 mentioned flow fields. Likewise the continuous presence of observers 

 in the habitat would provide an opportunity to monitor and photograph a 

 wide variety of flow conditions. It is conceivable that remote dye 

 releases could be made from the habitat under storm conditions, thus 

 providing critical information on the turbulent flow induced by the 

 habitat under high energy conditions. The potential of this technique 

 should be taken into account in future planning for subsurface habitat 

 programs. The amount and type of both applied and basic information 

 which could be obtained by a habitat based investigation would be orders 

 of magnitude greater than could be obtained by a similar surface based 

 inves tigation . 



VH-52 



