the results of experiments, such as scour and fill around 

 structures, radioisotope-generator performance, material 

 corrosion and deterioration, fouling and turbidity 

 suppression tests. 



Short-term bottom current measurements will be obtained 

 at the proposed SEACON sites using the DOTIPOS -mounted 

 current meter. Long-term bottom current measurements may 

 be made from an oceanographic mooring system or from gages 

 mounted on the structure. Temperature measurements will 

 also be made using various systems. Water sampling will 

 be performed at the proposed sites using both the DOTIPOS 

 and a submersible. Some transmissibility measurements will 

 be made from a ship, and others using DOTIPOS for short- 

 term measurements and an oceanographic mooring system for 

 long-term data collection. 



Seafloor Topography . Topographic surveys using an acoustic 

 profiling system will be performed at the proposed SEACON 

 sites to provide information on the gross topographic 

 features of the sites. Topographic charts of the areas 

 will be generated by a computer using the data collection 

 and processing system currently being developed by NCEL. 



Information on the detailed topography and micro- 

 relief at the selected SEACON site will be obtained by 

 use of a tethered photographic camera as well as by 

 cameras on DOTIPOS and/or a submersible. Side-scan sonar 

 and stereo-photographic techniques may also be used to 

 obtain data on the small scale topography at the chosen 

 SEACON site. It is anticipated that this will be a joint 

 effort with the Naval Oceanographic Office. 



An evaluation will be made of the various techniques 

 used for determining seafloor microrelief. The informa- 

 tion on microrelief will be used in choosing the precise 

 location for SEACON and in the detailed design of some of 

 the other experiments for SEACON. 



The topographic characteristics of the site will be 

 evaluated relative to the variation of sediment properties 

 at the site. 



Sub-Bottom Sediment Profiling . Sub-bottom surveys of the 

 proposed SEACON sites will be performed in order to pro- 

 vide information on site geology, depth of sediment over- 

 lying rock and sediment layering. A comparison of the 

 profiles determined by sub-bottom sounding and those 



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