LEGEND 



CM5.«t^' 



Figure 5. Current meter deployment site map 



instantaneous direction is taken at the end of that interval. Both values, 

 along with temperature and conductivity, are recorded on a magnetic tape. The 

 averaging interval selected was 2 min, allowing a total tape capacity of 

 34 days . 



21. Prior to deployment, each meter was calibrated at the US Geological 

 Survey (USGS) calibration facility at the Stennis Space Center, Mississippi, 

 by tank tow at three known velocities through still water. The calibration 

 coefficients for each impeller/bearing combination were used in postprocessing 

 the data. Compasses were bench checked and accepted if within manufacturer's 

 tolerances without individual corrections. 



Mounting 



22. Figure 6 illustrates a typical current meter string in place. A 

 spherical 36-in.-diam steel buoy was attached to a 900-lb railroad wheel with 

 a l/4-in.-diam mooring cable. A taut moor was maintained in spite of the tid- 

 al variation by including a length of l-in.-diam rubber cord below the buoy. 

 The cable was attached at either end with 3/8-in. screw-pin shackles. Each 

 buoy supported an 8- ft mast with a radar reflector and amber marker light. 

 For additional visibility, two or three "guardian" buoys of similar design 



13 



