232 interface as an ASCII file. The internal memory was sufficient to hold a 

 day's profiling record, but the latter mode was selected. By connecting the 

 meter to a lap -top computer on the boat for the profiling experiment, the 

 operator could verify operation and reasonableness of the data. 



33. The backup gage for the profiling experiment was a second solid 

 state meter, with cable and computer of the same design. Both profiling 

 meters were calibrated prior to use at the USGS facility. 



Method 



34. A profiling schedule that included a flow reversal as well as a 

 peak flood and ebb in the measurement interval was developed for the period 

 6-14 August 1987 (Figure 7). 



35. Ranges 7 and 8 were combined in one interval because of their prox 

 imity, as were Stations 9-12; otherwise, one range was measured per "day." 

 Because of the progression of the tidal cycle relative to the diurnal, subse- 

 quent intervals progressed, taxing the endurance and sleep habits of the crew 

 Including preparations, crew changes, equipment maintenance, data reduction, 

 and inevitable unexpected occurrences, each shift lasted 14 to 16 hr. 



36. Measurements were taken from a 26-ft, outboard-powered workboat 

 fitted with a LORAN and depth sounder. Because of the constant ship traffic, 

 separate radar reflectors were installed on the mast to increase target 



CURRENT PROFILE RANGES 

 P3 P5 P-9-12 P-7&8 P4 P1 P2 P6 



DAYS; AUGUST, 1987 



LEGEND 



DAY 



NIGHT 



TIDE CYCLE 

 MEASURED TIDE CYCLE 



Figure 7. Current profiling schedule with predicted tides 



17 



