£(« - u) 



\ N - 1 

 N AT - 1 



(3-17) 



c. Skewness of the velocity components 



»*». 



1*3. 



= E(« - «) 3 



= E(H> - V^) 3 



(3-18) 



d. Kurtosis of the velocity components 



u _ E(« - ») 4 



»*4. 



= E(* - *) 4 



(3-19) 



e. Maximum velocity components u mac and w^,. 



/ Minimum velocity components u^ and w^ defined as the largest 

 negative velocities. 



g. Percent of measurements with the gauge submerged. 



Data file format 



Resistance wave gauge and electromagnetic current meter data were saved 

 in unformatted, direct access files with all channels for each run contained in 

 one file. Data were archived on TK70 tape cartridges with the Digital 

 Electronics Corporation VAX VMS backup utility. 



Sample data 



Resistance wave gauge. A sample of the raw resistance wave gauge data 

 is shown in Figure 3-3 for Gauge 6, Run S031 1A. Every fourth data point of 

 the time series is plotted. The low-pass signal is also included in Figure 3-3, 

 appearing as the smoother line. Figure 3-4 shows the time series of the high- 

 pass signal for the same gauge and run. Wave groups are evident in the time 



66 



Chapter 3 SUPERTANK Hydrodynamics 



