Figure 3-1 . Current meter mounting configuration 



approximately 2 ft (0.6 m) out from the channel wall. Figure 3-1 shows an 

 example of the current meter mounting configuration. The current meters 

 deployed off the carriage were hose clamped to angles bolted to an aluminum 

 wing-shaped section hanging down from the carriage. The wing elevation was 

 adjusted with a winch and clamped into place to provide a steady platform for 

 the meters. 



Instrument characteristics 



Resistance wave gauges. The largest source of error in the gauge is 

 expected to be the change in resistivity (change in conductivity of the water, 

 contamination of the probes, or residual errors in the calibration procedure), 

 typically about 2 percent. The range of the gauges was fixed by the vertical 

 range of the wires, -1 to -8 ft (-0.3 to 2.4 m). Occasionally, waves exceeded 

 the top of a gauge (produced by a combination of large wave height and high 

 water level) and saturated the signal. Gauge calibrations were linear. 



58 



Chapter 3 SUPERTANK Hydrodynamics 



